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| Best Seller  | JMac Customs Buffer Tube Adapter for MAK-90 Slant Cut Stamped Receiver Hard Coat Anodized Black M4-MAK-S. Stake that Castle Nut No Need to Remove the Buffer Tube to swap adapters Specifications for JMac Customs Buffer Tube Adapter for MAK-90 Slant Cut... ... more | FREE shipping go to store |
 | Sons of Liberty Gun Works Receiver Extension Kit 6 Pos RE Blue Spring H Buffer Castle Nut End Plate Black REKITMILSPEC. Established using several of the most durable and long lasting resources available these AR15 Buffer Assemblies via Sons of Liberty... ... more | FREE shipping go to store |
| Best Seller  | Ergo Grips Ar-15/M16 Lower Receiver Spring Kit - Lower Receiver Spring Kit All the factory-weight springs needed to finish building up a stripped lower receiver or refurbish an existing lower to like-new function. Replace worn, corroded, or fatigued springs before they fail-inexpensive insurance against game-ending stoppages... ... more
Ergo Grips Ar-15/M16 Lower Receiver Spring Kit - Lower Receiver Spring Kit All the factory-weight springs needed to finish building up a stripped lower receiver or refurbish an existing lower to like-new function. Replace worn, corroded, or fatigued springs before they fail-inexpensive insurance against game-ending stoppages... | go to store |
 | Brownells Ar-15/M16/M4 Replacement Pins - Ar-15/M16/M4 Round Replacement Pins 3 Pack Our handy, compact tool is uniquely designed to combine several tools into one. It has a spanner wrench that fits the receiver extension castle nut on M4-style collapsible buttstocks, with interchangeable pins to fit nuts with both old (round) and new... ... more
Brownells Ar-15/M16/M4 Replacement Pins - Ar-15/M16/M4 Round Replacement Pins 3 Pack Our handy, compact tool is uniquely designed to combine several tools into one. It has a spanner wrench that fits the receiver extension castle nut on M4-style collapsible buttstocks, with interchangeable pins to fit nuts with both old (round) and new... | go to store |
 | Guntec USA AR-15 Extreme Duty Wide Castle Nut For Car/M4 Buffer Tube Matte Rainbow Pvd Coated CASTLE-EXD-M-RPVD. The wide design of this AR15 Wide Castle Nut by Guntec USA makes the area around the buffer tube much less prone to snags and breakage... ... more | go to store |
 | Brownells Ar-15/M16 Lower Receiver Vise Block - Ar-15/M16 Action Block & Lower Vise Block Set Heavy-duty blocks allow you to firmly clamp AR-15/M16 receiver halves in a vise without risk of crushing, twisting, or otherwise distorting them when applying vise pressure or torquing the barrel nut. Keeps your rifle secure for safe, effective... ... more
Brownells Ar-15/M16 Lower Receiver Vise Block - Ar-15/M16 Action Block & Lower Vise Block Set Heavy-duty blocks allow you to firmly clamp AR-15/M16 receiver halves in a vise without risk of crushing, twisting, or otherwise distorting them when applying vise pressure or torquing the barrel nut. Keeps your rifle secure for safe, effective... | go to store |
 | Brownells Ar-15/M16/M4 Replacement Pins - Ar-15/M16/M4 Square Replacement Pins 3 Pack Our handy, compact tool is uniquely designed to combine several tools into one. It has a spanner wrench that fits the receiver extension castle nut on M4-style collapsible buttstocks, with interchangeable pins to fit nuts with both old (round) and new... ... more
Brownells Ar-15/M16/M4 Replacement Pins - Ar-15/M16/M4 Square Replacement Pins 3 Pack Our handy, compact tool is uniquely designed to combine several tools into one. It has a spanner wrench that fits the receiver extension castle nut on M4-style collapsible buttstocks, with interchangeable pins to fit nuts with both old (round) and new... | go to store |
 | Luth-Ar Ar-15 Mba-3/Mba-4 Carbine Castle Nut - Ar-15 Mba-3/Mba-4 Carbine Castle Nut Black Steel FITS: The Luth-AR Carbine Lock Ring/Castle Nut for MBA-3 and MBA-4 Carbine Buffer Kits, as well as any Mil-Spec or Commercial Carbine receiver extension. Mfg: Luth-Ar ... more
Luth-Ar Ar-15 Mba-3/Mba-4 Carbine Castle Nut - Ar-15 Mba-3/Mba-4 Carbine Castle Nut Black Steel FITS: The Luth-AR Carbine Lock Ring/Castle Nut for MBA-3 and MBA-4 Carbine Buffer Kits, as well as any Mil-Spec or Commercial Carbine receiver extension. Mfg: Luth-Ar | go to store |
 | Aero Precision Ar-15 Buffer Tube Lock Nut - Receiver Extension Lock Nut For Ar-15 Black Mil-spec. receiver extension lock nut (castle nut) for use on AR15 carbines with an adjustable stock. Perfect for your new build or as a direct replacement for worn out parts. Made in the USA. Mfg: Aero Precision ... more
Aero Precision Ar-15 Buffer Tube Lock Nut - Receiver Extension Lock Nut For Ar-15 Black Mil-spec. receiver extension lock nut (castle nut) for use on AR15 carbines with an adjustable stock. Perfect for your new build or as a direct replacement for worn out parts. Made in the USA. Mfg: Aero Precision | go to store |
 | Brownells Ar-15/M16 Barrel Extension Torque Tools - Ar-15/M16 Barrel Extension Torque Tool Handy tool aids in applying straight-line torque for fast, easy installation of the barrel nut without scratching the exterior of the upper receiver. Helps ensure the right amount of torque is evenly applied, while maintaining proper alignment of the... ... more
Brownells Ar-15/M16 Barrel Extension Torque Tools - Ar-15/M16 Barrel Extension Torque Tool Handy tool aids in applying straight-line torque for fast, easy installation of the barrel nut without scratching the exterior of the upper receiver. Helps ensure the right amount of torque is evenly applied, while maintaining proper alignment of the... | go to store |
 | Strike Industries Ar Receiver Enhanced Castle Nut W/Extended Qd Endplate - Ar Receiver Enhanced Cast Yet another first, the Enhanced Castle Nut and Extended End plate combo represent Strike Industries' dedication to thinking outside the box. The SI Enhanced ECN and EEP stand out from the generic parts kit units in both aesthetics and function. The... ... more
Strike Industries Ar Receiver Enhanced Castle Nut W/Extended Qd Endplate - Ar Receiver Enhanced Cast Yet another first, the Enhanced Castle Nut and Extended End plate combo represent Strike Industries' dedication to thinking outside the box. The SI Enhanced ECN and EEP stand out from the generic parts kit units in both aesthetics and function. The... | go to store |
 | Strike Industries Ar Receiver Enhanced Castle Nut W/Extended Qd Endplate - Ar Receiver Enhanced Cast Yet another first, the Enhanced Castle Nut and Extended End plate combo represent Strike Industries' dedication to thinking outside the box. The SI Enhanced ECN and EEP stand out from the generic parts kit units in both aesthetics and function. The... ... more
Strike Industries Ar Receiver Enhanced Castle Nut W/Extended Qd Endplate - Ar Receiver Enhanced Cast Yet another first, the Enhanced Castle Nut and Extended End plate combo represent Strike Industries' dedication to thinking outside the box. The SI Enhanced ECN and EEP stand out from the generic parts kit units in both aesthetics and function. The... | go to store |
 | Brownells Ar-15/M16 Receiver Taps & Dies - 1 3/16"-16 Tpi Tap Chases and cleans the two most important threads on the AR-15/M16 receivers. 1.250"-18 tpi - Corrects out of spec or cross-threaded upper receivers and barrel nuts. 1-3/16"-16 tpi - Makes receiver extension (recoil buffer) tube and lower receiver... ... more
Brownells Ar-15/M16 Receiver Taps & Dies - 1 3/16"-16 Tpi Tap Chases and cleans the two most important threads on the AR-15/M16 receivers. 1.250"-18 tpi - Corrects out of spec or cross-threaded upper receivers and barrel nuts. 1-3/16"-16 tpi - Makes receiver extension (recoil buffer) tube and lower receiver... | go to store |
 | Brownells Ar-15/M16 Receiver Taps & Dies - 1 3/16"-16 Tpi Die Chases and cleans the two most important threads on the AR-15/M16 receivers. 1.250"-18 tpi - Corrects out of spec or cross-threaded upper receivers and barrel nuts. 1-3/16"-16 tpi - Makes receiver extension (recoil buffer) tube and lower receiver... ... more
Brownells Ar-15/M16 Receiver Taps & Dies - 1 3/16"-16 Tpi Die Chases and cleans the two most important threads on the AR-15/M16 receivers. 1.250"-18 tpi - Corrects out of spec or cross-threaded upper receivers and barrel nuts. 1-3/16"-16 tpi - Makes receiver extension (recoil buffer) tube and lower receiver... | go to store |
 | Brownells Ar-15/M16 Receiver Taps & Dies - 1-3/16-16 Carbon Steel Hex Die Chases and cleans the two most important threads on the AR-15/M16 receivers. 1.250"-18 tpi - Corrects out of spec or cross-threaded upper receivers and barrel nuts. 1-3/16"-16 tpi - Makes receiver extension (recoil buffer) tube and lower receiver... ... more
Brownells Ar-15/M16 Receiver Taps & Dies - 1-3/16-16 Carbon Steel Hex Die Chases and cleans the two most important threads on the AR-15/M16 receivers. 1.250"-18 tpi - Corrects out of spec or cross-threaded upper receivers and barrel nuts. 1-3/16"-16 tpi - Makes receiver extension (recoil buffer) tube and lower receiver... | go to store |
 | Brownells Ar-15/M16 Receiver Taps & Dies - 1.250"-18 Tpi Tap Chases and cleans the two most important threads on the AR-15/M16 receivers. 1.250"-18 tpi - Corrects out of spec or cross-threaded upper receivers and barrel nuts. 1-3/16"-16 tpi - Makes receiver extension (recoil buffer) tube and lower receiver... ... more
Brownells Ar-15/M16 Receiver Taps & Dies - 1.250"-18 Tpi Tap Chases and cleans the two most important threads on the AR-15/M16 receivers. 1.250"-18 tpi - Corrects out of spec or cross-threaded upper receivers and barrel nuts. 1-3/16"-16 tpi - Makes receiver extension (recoil buffer) tube and lower receiver... | go to store |
 | Brownells Ar-15/M16 Lower Receiver Vise Block Heavy-duty blocks allow you to firmly clamp AR-15/M16 receiver halves in a vise without risk of crushing, twisting, or otherwise distorting them when applying vise pressure or torquing the barrel nut. Keeps your rifle secure for safe, effective... ... more
Brownells Ar-15/M16 Lower Receiver Vise Block Heavy-duty blocks allow you to firmly clamp AR-15/M16 receiver halves in a vise without risk of crushing, twisting, or otherwise distorting them when applying vise pressure or torquing the barrel nut. Keeps your rifle secure for safe, effective... | go to store |
 | Brownells Ar-15/M16 Upper Receiver Action Block Heavy-duty blocks allow you to firmly clamp AR-15/M16 receiver halves in a vise without risk of crushing, twisting, or otherwise distorting them when applying vise pressure or torquing the barrel nut. Keeps your rifle secure for safe, effective... ... more
Brownells Ar-15/M16 Upper Receiver Action Block Heavy-duty blocks allow you to firmly clamp AR-15/M16 receiver halves in a vise without risk of crushing, twisting, or otherwise distorting them when applying vise pressure or torquing the barrel nut. Keeps your rifle secure for safe, effective... | go to store |
 | Cmmg Ar-15 Mk4 Receiver Extension Nut Replacement AR-15 Mk4 Receiver Extension Nut. Mfg: Cmmg ... more
| go to store |
 | Brownells Ar-15/M16 Mil-Spec Buffer Tube Assembly - M4 Mil-Spec Buffer Tube Assembly Features: Six position AR-15/M16/M4 receiver extension assembly Includes Mil-Spec receiver extension/buffer tube, receiver lock plate, lock-nut/castle nut, carbine buffer and carbine buffer spring Buffer tube is Mil-Spec diameter and 6061 aluminum... ... more
Brownells Ar-15/M16 Mil-Spec Buffer Tube Assembly - M4 Mil-Spec Buffer Tube Assembly Features: Six position AR-15/M16/M4 receiver extension assembly Includes Mil-Spec receiver extension/buffer tube, receiver lock plate, lock-nut/castle nut, carbine buffer and carbine buffer spring Buffer tube is Mil-Spec diameter and 6061 aluminum... | go to store |
 | Magpul Ar-15/M16 Armorer's Wrench - Armorer's Wrench American-Made, solid steel construction with grip-enhancing phosphate finish engages both stock and pin-style barrel nuts. Fits standard sized flash hiders. Installs and removes rifle receiver extensions and carbine castle nuts, with extended teeth for... ... more
Magpul Ar-15/M16 Armorer's Wrench - Armorer's Wrench American-Made, solid steel construction with grip-enhancing phosphate finish engages both stock and pin-style barrel nuts. Fits standard sized flash hiders. Installs and removes rifle receiver extensions and carbine castle nuts, with extended teeth for... | go to store |
 | Brownells Ar-15/M16 Combination Wrench An exact duplicate of the original factory/military design so you know it will fit and work. Use for several jobs: to remove the barrel nut; to remove and install old and new flash suppressors; to remove and install the lower receiver extension. Mfg:... ... more
Brownells Ar-15/M16 Combination Wrench An exact duplicate of the original factory/military design so you know it will fit and work. Use for several jobs: to remove the barrel nut; to remove and install old and new flash suppressors; to remove and install the lower receiver extension. Mfg:... | go to store |
 | Centurion Arms Ar-15/M16 C4 Carbine Cutout Rail System - Carbine Cutout, 9 5/8" $20 off $200+. Use code SEPT20Two-piece, four-rail handguard installs easily and gives flattop receivers a continuous 12 o'clock rail. Clamps directly to standard barrel nut and features T-marks for proper optic and accessory remounting reference. Machined aluminum construction... ... more
Centurion Arms Ar-15/M16 C4 Carbine Cutout Rail System - Carbine Cutout, 9 5/8" Two-piece, four-rail handguard installs easily and gives flattop receivers a continuous 12 o'clock rail. Clamps directly to standard barrel nut and features T-marks for proper optic and accessory remounting reference. Machined aluminum construction... | go to store |
 | Daniel Defense Ar-15/M16 Ez Carbine Sling Mount - Ez Carbine Sling Mount W/Swivel The Daniel Defense EZ Carbine Mount attaches quickly to any AR15/M4 with a collapsible buttstock and Mil-Spec Receiver Extension (Buffer Tube). It is CNC machined from 6061 T6 Aluminum and has a durable Type III Mil-Spec Hard Coat Anodized finish.... ... more
Daniel Defense Ar-15/M16 Ez Carbine Sling Mount - Ez Carbine Sling Mount W/Swivel The Daniel Defense EZ Carbine Mount attaches quickly to any AR15/M4 with a collapsible buttstock and Mil-Spec Receiver Extension (Buffer Tube). It is CNC machined from 6061 T6 Aluminum and has a durable Type III Mil-Spec Hard Coat Anodized finish.... | go to store |
 | Centurion Arms Ar-15/M16 C4 Rail Systems - Mid-Length, 9" $20 off $200+. Use code SEPT20Two-piece, four-rail handguard installs easily and gives flattop receivers a continuous 12 o'clock rail. Clamps directly to standard barrel nut. Machined aluminum construction combines strength with light weight. Free floats the barrel. Available for... ... more
Centurion Arms Ar-15/M16 C4 Rail Systems - Mid-Length, 9" Two-piece, four-rail handguard installs easily and gives flattop receivers a continuous 12 o'clock rail. Clamps directly to standard barrel nut. Machined aluminum construction combines strength with light weight. Free floats the barrel. Available for... | go to store |
 | Centurion Arms Ar-15/M16 C4 Rail Systems - Rifle, 12" $20 off $200+. Use code SEPT20Two-piece, four-rail handguard installs easily and gives flattop receivers a continuous 12 o'clock rail. Clamps directly to standard barrel nut. Machined aluminum construction combines strength with light weight. Free floats the barrel. Available for... ... more
Centurion Arms Ar-15/M16 C4 Rail Systems - Rifle, 12" Two-piece, four-rail handguard installs easily and gives flattop receivers a continuous 12 o'clock rail. Clamps directly to standard barrel nut. Machined aluminum construction combines strength with light weight. Free floats the barrel. Available for... | go to store |
 | Centurion Arms Ar-15/M16 C4 Rail Systems - Mid-Length, 10" $20 off $200+. Use code SEPT20Two-piece, four-rail handguard installs easily and gives flattop receivers a continuous 12 o'clock rail. Clamps directly to standard barrel nut. Machined aluminum construction combines strength with light weight. Free floats the barrel. Available for... ... more
Centurion Arms Ar-15/M16 C4 Rail Systems - Mid-Length, 10" Two-piece, four-rail handguard installs easily and gives flattop receivers a continuous 12 o'clock rail. Clamps directly to standard barrel nut. Machined aluminum construction combines strength with light weight. Free floats the barrel. Available for... | go to store |
 | Real Avid Master-Fit Extended & Standard 2-Sided Castle Nut Wrench Specialized, precise-fitment armorer's crowfoot wrench, fits �" receiver torque wrench head - Purposefully designed, 2-sided, to fit buffer tube's extended and standard castle nuts - Titanium coated stainless steel to confidently apply desired torque... ... more
Real Avid Master-Fit Extended & Standard 2-Sided Castle Nut Wrench Specialized, precise-fitment armorer's crowfoot wrench, fits �" receiver torque wrench head - Purposefully designed, 2-sided, to fit buffer tube's extended and standard castle nuts - Titanium coated stainless steel to confidently apply desired torque... | go to store |
 | Real Avid Master-Fit Thin Castle Nut Wrench Specialized, precise-fitment armorer's crowfoot wrench, fits �" receiver torque wrench head - Purposefully designed to fit castle nuts on pistol buffer tubes, where compact build doesn't allow for a standard wrench head - Titanium coated stainless... ... more
Real Avid Master-Fit Thin Castle Nut Wrench Specialized, precise-fitment armorer's crowfoot wrench, fits �" receiver torque wrench head - Purposefully designed to fit castle nuts on pistol buffer tubes, where compact build doesn't allow for a standard wrench head - Titanium coated stainless... | go to store |
 | Rock River Arms Ar-15 M4 Stock Wrench - M4 Stock Wrench Steel, dual function wrench lets you easily remove your old extension tube and install a new-style, A4 stock. Spanner has three lugs to fit the A4-style castle nut. Provides a non-slip fit so you can hand tighten the castle nut to the receiver. Also,... ... more
Rock River Arms Ar-15 M4 Stock Wrench - M4 Stock Wrench Steel, dual function wrench lets you easily remove your old extension tube and install a new-style, A4 stock. Spanner has three lugs to fit the A4-style castle nut. Provides a non-slip fit so you can hand tighten the castle nut to the receiver. Also,... | go to store |
 | Magpul Ar-15 Bev Block - Bev Block-Ar15/M4 The BEV Block (Barrel Extension Vise) is an all-in-one, compact vise block tool for AR assembly operations of barrel nuts, flash hiders, etc. Mounts securely in a vise and provides support for both billet and forged upper receivers. Engages barrel... ... more
Magpul Ar-15 Bev Block - Bev Block-Ar15/M4 The BEV Block (Barrel Extension Vise) is an all-in-one, compact vise block tool for AR assembly operations of barrel nuts, flash hiders, etc. Mounts securely in a vise and provides support for both billet and forged upper receivers. Engages barrel... | go to store |
 | LWRCI Ultra Compact Stock Kit For Ar-15 Black 200-0092A01 LWRCI Ultra Compact Stock Kit For Ar-15 Black 200-0092A01. The stock kit includes the stock receiver extension index plate buffer recoil spring and castle nut. The systems components were designed to work together and should be installed together for... ... more | FREE shipping go to store |
 | Aero Precision Ar-15 Enhanced Pistol Buffer Tube - Enhanced Pistol Buffer Tube For Ar-15 Black The Enhanced Pistol Tube features a slot in the threads to allow use of a standard end-plate and castle nut. Fits standard AR15 and M5 (.308) lower receivers 7075 Aluminum Tube only (no endplate/buffer/spring) Uses a stardard end-plate and standard... ... more
Aero Precision Ar-15 Enhanced Pistol Buffer Tube - Enhanced Pistol Buffer Tube For Ar-15 Black The Enhanced Pistol Tube features a slot in the threads to allow use of a standard end-plate and castle nut. Fits standard AR15 and M5 (.308) lower receivers 7075 Aluminum Tube only (no endplate/buffer/spring) Uses a stardard end-plate and standard... | go to store |
 | Aero Precision Epc-9 9mm/40 S&W Carbine Complete Lower W/A2 Grip & M4 Stock - Epc-9 Carbine Complete $20 off $200+. Use code SEPT20The Aero Precision EPC-9 Complete Lower Receiver is the perfect base for your custom AR9 build. Includes: EPC-9 Lower Receiver A2 Pistol Grip M4 Stock Lower Parts Kit Enhanced Buffer Tube EPC 7.7oz Buffer M5 Carbine Buffer Spring Castle nut/end plate... ... more
Aero Precision Epc-9 9mm/40 S&W Carbine Complete Lower W/A2 Grip & M4 Stock - Epc-9 Carbine Complete The Aero Precision EPC-9 Complete Lower Receiver is the perfect base for your custom AR9 build. Includes: EPC-9 Lower Receiver A2 Pistol Grip M4 Stock Lower Parts Kit Enhanced Buffer Tube EPC 7.7oz Buffer M5 Carbine Buffer Spring Castle nut/end plate... | go to store |
 | Tacfire Remington 870 Stock Kit/M4 Style Stock Black MSG014 Tacfire Remington 870 Stock Kit/M4 Style Stock Black MSG014. These Shotgun Stocks by TacFire come with the full kit including a Remington 870 pistol grip pre-attached 3-shotshell side saddle mil-spec buffer tube castle nut and M4 6 position stock. When... ... more | go to store |
 | Wilson Combat Ar-15 Super-Stoc Retro-Fit Buttstock Kit For your next custom AR-15, M16, M4 build. The Wilson Combat Carbine receiver extension machined from 7075-T6 aluminum and manufactured to Mil-Spec dimensions and specifications. Hard Coat Anodized per Mil-A-8625F, Type III, Class 2. These tubes should... ... more
Wilson Combat Ar-15 Super-Stoc Retro-Fit Buttstock Kit For your next custom AR-15, M16, M4 build. The Wilson Combat Carbine receiver extension machined from 7075-T6 aluminum and manufactured to Mil-Spec dimensions and specifications. Hard Coat Anodized per Mil-A-8625F, Type III, Class 2. These tubes should... | go to store |
 | Advanced Technology Ar-15 Military Mil-Spec Buffer Tube Assembly Package AR-15 Military-Spec Buffer Tube Military Diameter Threads for Maximum Fit into AR-15 Receiver Constructed of Military Type III Anodized, 6061 T6 Aluminum Includes Steel Military Grade E-Coated Castle Nut and Locking Ring Includes AR-15 Recoil Plug &... ... more
Advanced Technology Ar-15 Military Mil-Spec Buffer Tube Assembly Package AR-15 Military-Spec Buffer Tube Military Diameter Threads for Maximum Fit into AR-15 Receiver Constructed of Military Type III Anodized, 6061 T6 Aluminum Includes Steel Military Grade E-Coated Castle Nut and Locking Ring Includes AR-15 Recoil Plug &... | go to store |
 | Brownells Ar-15 Armorer's Wrench Brownells new AR-15 Armorer's Wrench works with either encapsulated or peg-style barrel nuts. The long handle ends with a carbine buttstock wrench that features four teeth that ensure full engagement of all four notches in an M4-style receiver... ... more
Brownells Ar-15 Armorer's Wrench Brownells new AR-15 Armorer's Wrench works with either encapsulated or peg-style barrel nuts. The long handle ends with a carbine buttstock wrench that features four teeth that ensure full engagement of all four notches in an M4-style receiver... | go to store |
 | Brownells Car-15/M4 Buttstock Wrench - M4 Buttstock Wrench Dedicated wrench has four precision-machined teeth that ensure full, non-slip engagement of all four notches in an M4-type receiver extension nut for easy removal and installation of collapsible carbine buttstocks. Transfers all the torquing force to... ... more
Brownells Car-15/M4 Buttstock Wrench - M4 Buttstock Wrench Dedicated wrench has four precision-machined teeth that ensure full, non-slip engagement of all four notches in an M4-type receiver extension nut for easy removal and installation of collapsible carbine buttstocks. Transfers all the torquing force to... | go to store |
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