AR-15, M4, AR-10, and M16 parts include components for maintaining, repairing, upgrading, and customizing popular modern sporting rifle platforms. This category includes replacement parts, internal components, controls, small parts, hardware, and accessories designed for compatible rifle builds and configurations. Whether you are servicing a current rifle, completing a build, or upgrading performance and ergonomics, choosing the correct platform-specific parts helps ensure proper fit and dependable function.
- AR-15 Lowers
- AR-15 Uppers
- AR-15 Triggers
- AR-15 Bolt Carrier Groups / BCG
- AR-15 Stocks
- AR-15 Grips
- AR-15 Buffer / Tubes
- AR-15 Bolt Catch
- AR -15 Magazine Catch
- AR-15 Charging Handles
- AR-15 Safety Selectors
- AR-15 Hand Stops
- AR-15 Forward Assist
- AR-15 Ejection Port Covers & Parts
- AR-15 Handguards & Rails
- AR-15 Barrels
- AR-15 Gas System Parts
- AR-15 Parts & Kits
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Products List
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BATTLEARMS Takedown Spring Retainer Screw
Battle Arms Development$0.754-48 x 1/8in Cup Point Set Screw .050in Allen -
BATTLEARMS Mil-Spec ARMil-Spec AR15/LR308 T15/LR308 Trigger Disconnector Spring - Semi Auto
Battle Arms Development$1.99Ensure your AR-15 or LR-308 rifle operates reliably with our Mil-Spec Trigger Disconnector Spring designed specifically for semi-automatic platforms. Manufactured to strict military specifications, this trigger disconnector spring guarantees consistent... -
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BATTLEARMS Mil-Spec Trigger Spring for AR-15 and LR-308 Rifles
Battle Arms Development$1.79Upgrade or restore your AR-15 or LR-308 rifle with our reliable Mil-Spec Trigger Spring. Precision-crafted to military standards, this high-quality trigger spring ensures consistent and dependable trigger performance in your firearm. Made from durable... -
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BATTLEARMS AR15/M4 Takedown and Pivot Pin Detent – Precision Fit for Secure Pin Retention
Battle Arms Development$1.00The AR15/M4 Takedown and Pivot Pin Detent is a vital small part that plays a big role in the function of your rifle. This precision-machined detent retains the front and rear takedown pins securely in place, ensuring your upper and lower receivers stay... -
BATTLEARMS AR15/M16 Magazine Catch Spring
Battle Arms Development$3.00AR15/M16 Mil-Spec Magazine Catch Spring -
BATTLEARMS Lightweight Butt Stock for SABERTUBE
Battle Arms Development$79.95Lightweight Butt Stock (BAD-LBS) for the SABERTUBE® Receiver Extension/Buffer Tube Features: Clean, beautiful, no-nonsense, minimalistic design Precision CNC from billet 7075T6 Aircraft Grade Aluminum MilSpec Type III Class 2 Hard Anodized... -
BATTLEARMS AR15/M16 Style Receiver End Plate
Battle Arms Development$5.99AR15/M16 Receiver End Plate Mil-spec. receiver extension end plate. For use on AR15 carbines with an adjustable stock. Made in the USA -
BATTLEARMS AR15/M16 Receiver Extension Nut (Castle Nut)
Battle Arms Development$7.00AR15/M16 Receiver Extension Lock Nut 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. -
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BATTLEARMS VERT PDW Stock System - Buffer Tube Wrench
Battle Arms Development$10.00VERT® PDW Stock System - Buffer Tube Wrench -
BATTLEARMS VERT V2 Cheek Rest Screw – Kydex
Battle Arms Development$0.75The VERT V2 Cheek Rest Screw is a precision replacement and upgrade component designed specifically for Kydex cheek rests on rifles and tactical stocks. Built for durability and ease of use, this screw ensures a secure and reliable mount for your cheek... -
BATTLEARMS SABERTUBE QD Lightweight Stock Kit
Battle Arms Development$199.95SABERTUBE® Mid Length or Rifle Length QD End Plate Lightweight Stock Combo Includes: SABERTUBE® Lightweight Receiver Extension/Buffer Tube, End Plate Model for the BAD-LBS Lightweight Butt Stock. Features: Midlength 8 1/4in or Rifle 9... -
BATTLEARMS VERT CSS Compact Stock System - Cheek Rest - Kydex Carbon Fiber Pattern
Battle Arms Development$25.00Replacement Kydex Cheek Rest for Vert CSS Stock -
BATTLEARMS VERT PDW Stock System - Cheek Rest - Kydex Carbon Fiber Pattern
Battle Arms Development$25.00Replacement Cheek Rest for VERT PDW Stock Monolithic Lower -
BATTLEARMS BAD-CSS/PDW Tailhook Adapter
Battle Arms Development$80.00VERT® Stock System Adapter to convert for use with GearHead Works Tailhook Mod 1 Does not include: Tailhook Mod 1 Screws Cheek Rest Adapter Only. Installation instructions. Remove two screws from stock piece, remove the buttstock... -
BATTLEARMS AR15/M16 Carbine Buffer Spring
Battle Arms Development$4.00The AR15/M16 Carbine Buffer Spring is a Mil-Spec replacement recoil spring designed for carbine-length receiver extensions. This essential component ensures proper cycling, smooth operation, and reliable performance in AR-platform rifles and carbines... -
BATTLEARMS Carbine Buffer Standard Weight 3.0 oz / AR15 / M16
Battle Arms Development$16.00Battle Arms Development Carbine Buffer Standard Weight 3.0 oz Silver for AR15 / M16 The Battle Arms Development AR15-BUFFER-C Carbine Buffer is a mil-spec standard-weight buffer built for AR15 and M16 carbines with a collapsible stock. Finished in silver... -
BATTLEARMS VERT Heavy Extra Power Buffer Spring - Upgraded Spring / AR-15 / AR9 / 300 BLK
Battle Arms Development$26.50Optimize your AR platform's performance with the Battle Arms VERT Heavy Extra Power Buffer Spring. Engineered for superior recoil control and reliable cycling, this upgraded spring is ideal for AR-15, AR9, and .300 BLK configurations, especially those... -
BATTLEARMS Development VERT V2 PDW Buffer Kit 9mm for AR9 PCC
Battle Arms Development$150.00The Battle Arms Development VERT V2 PDW Buffer Kit is a compact recoil system engineered specifically for dedicated 9mm AR-pattern pistol caliber carbines. Designed to provide reliable cycling and smooth operation in space-constrained PDW configurations,... -
BATTLEARMS SABERTUBE Quick Disconnect End Plate (AR15/M16/M4/AR9/AR10)
Battle Arms Development$34.99Battle Arms SABERTUBE Quick Disconnect End Plate (AR15/M16/M4/AR9/AR10) The Battle Arms Development SABERTUBE Quick Disconnect End Plate is a premium, purpose-built end plate designed to add a clean, secure sling attachment point to your rifle or pistol... -
BATTLEARMS Mil-Spec 6 Position Carbine Buffer Tube
Battle Arms Development$39.95Mil-Spec Receiver Extension / Buffer Tube, 6 Position Features: Mil-Spec Carbine Length Receiver Extension / Buffer Tube 6 Positions Precision CNC from 7075T6 Aircraft Grade Aluminum Impact Forging Mil-Spec Type III Hard Anodized Black Made in the... -
BATTLEARMS SABERTUBE Lightweight Pistol Length Buffer Tube Kit
Battle Arms Development$124.95SABERTUBE Lightweight Pistol Length Buffer Tube Kit – AR15 / M16 / M4 / AR9 The Battle Arms Development SABERTUBE® Lightweight Pistol Length Buffer Tube Kit is a compact, purpose-built receiver extension and QD end plate combo designed for AR... -
BATTLEARMS SABERTUBE Direct to Receiver Mid-Length Pistol
Battle Arms Development$99.99SABERTUBE® DIRECT TO RECEIVER PISTOL Receiver Extension Includes: (1) SABERTUBE® DIRECT TO RECEIVER *PISTOL* Receiver Extension/Buffer Tube COMPATIBLE WITH GEAR HEAD WORKS TAILHOOK MOD 1 with Stepped down OD (outside diameter) at end... -
BATTLEARMS Mil-Spec 6 Position Carbine Buffer Tube OD Green
Battle Arms Development$49.95Mil-Spec Receiver Extension / Buffer Tube, 6 Position Features: Mil-Spec Carbine Length Receiver Extension / Buffer Tube 6 Positions Precision CNC from 7075T6 Aircraft Grade Aluminum Impact Forging Anodized OD Green Color Made in the USA -
BATTLEARMS Mil-Spec AR15 LR308 Single Stage Trigger Kit
Battle Arms Development$45.95Single Stage Mil-Spec Trigger Includes Phosphate Mil-Spec Trigger Rounded Hammer Disconnector Trigger Spring Hammer Spring Disconnector Springs Trigger and Hammer Pins with a Black Oxide Finish -
BATTLEARMS EKG AK Trigger Kit
Battle Arms Development$39.95BAD-EKG... Powering the Kalashnikov heart within you. Features: Maximum compatibility with most standard production AK patterned firearms. Enhanced hammer geometry to eliminate that "hump" feel when charging the AK, to give you that smooth custom... -
BATTLEARMS Polished Nickel Teflon Enhanced Trigger Kit
Battle Arms Development$49.99nhanced Nickel Teflon trigger assembly features smooth,precision-machined engagement surfaces and Nickel Teflon coating that removes the grittiness found in mil-spec triggers and provides a cleaner "break”. This single-stage trigger is functionally... -
BATTLEARMS Adjustable Friction-less Trigger
Battle Arms Development$268.00Battle Arms Development Special Edition Trigger by Triggertech Repeatable User Adjustable Trigger Pull from ~2 to 5 lbs with click feedback indications Frictionless Release Technology (FRT)™ Zero Creep Short Two Stage... -
BATTLEARMS Enhanced Complete Lower Parts Kit
Battle Arms Development$135.00BAD-LPK-PKX Enhanced Complete Lower Parts Kit Consisting of the following: BAD-EBC-IC Enhanced Bolt Catch Cost friendly alternative Lightweight but Robust Design 0.39oz Compatible with Norgon Ambi-Catch Without Interference Raised "T-Shaped" Heel... -
BATTLEARMS 3 Piece Enhanced Lower Parts Kit
Battle Arms Development$35.00BAD-LPK-PK3 3 Piece Enhanced Lower Parts Kit Consisting of the following: Enhanced Bolt Catch (BAD-EBC-IC), which is a cost-friendly alternative, without sacrificing the quality for your AR build! The AR-15 Cast Enhanced Bolt Catch is 8620 heat... -
BATTLE ARMS BAD-QRRTP - Quick Release Rear Takedown Pin
Battle Arms Development$30.00BAD-QRRTP Quick Release Rear Takedown Pin Features: Dual Function Easy Pull Head CNC Machined Comes with Detent and Spring Made in the USA! Patent US10101107B1 -
BATTLEARMS BAD-EPS-308 (Enhanced Pin Set) LR-308/SR-25/AR308
Battle Arms Development$29.95BATTLEARMS – BAD-EPS Enhanced Takedown & Pivot Pin Set (AR15/M16/M4/AR9) Item: BAD-EPS SKU: BAD-EPS UPC: 810033780394 Platform Compatibility: AR15 / M16 / M4 / AR9 The BATTLEARMS BAD-EPS® Enhanced Takedown and Pivot Pin Set upgrades one... -
BATTLEARMS AR15/M16 Takedown & Pivot Pin Detent Spring – AR15 Mil-Spec Replacement Part
Battle Arms Development$0.75Replace worn or lost detent springs in your AR15 or M16 rifle with this high-quality Mil-Spec spring from Battle Arms Development. Precision-engineered for reliability and durability, it’s perfect for custom builds, repairs, or routine maintenance... -
BATTLEARMS BAD-EPS FDE Aluminum Enhanced Takedown and Pivot Pin Set
Battle Arms Development$29.95Battle Arms Development Enhanced Pin Set (BAD-EPS) for the AR15 / M16 / M4 style rifles. The BAD-EPS features the following improvements and features: Precision Swiss CNC machined. AR15 / M16 / M4 Compatible - Fits all AR15/M16/M4 lower receivers with... -
BATTLEARMS Green Aluminum Enhanced Takedown / Pivot Pin Set
Battle Arms Development$29.95Battle Arms Development Enhanced Pin Set (BAD-EPS) for the AR15 / M16 / M4 style rifles. The BAD-EPS features the following improvements and features: Precision Swiss CNC machined. AR15 / M16 / M4 Compatible - Fits all AR15/M16/M4 lower receivers with... -
BATTLEARMS BAD-EPS Purple Aluminum Enhanced Takedown and Pivot Pin Set
Battle Arms Development$29.95Battle Arms Development Enhanced Pin Set (BAD-EPS) for the AR15 / M16 / M4 style rifles. The BAD-EPS features the following improvements and features: Precision Swiss CNC machined. AR15 / M16 / M4 Compatible - Fits all AR15/M16/M4 lower... -
BATTLEARMS BAD-EPS Blue Aluminum Enhanced Takedown and Pivot Pin Set
Battle Arms Development$29.95Battle Arms Development Enhanced Pin Set (BAD-EPS) for the AR15 / M16 / M4 style rifles. The BAD-EPS features the following improvements and features: Precision Swiss CNC machined. AR15 / M16 / M4 Compatible - Fits all AR15/M16/M4 lower... -
BATTLEARMS BATTLE ARMS BAD-EPS Enhanced Takedown and Pivot Pin Set AR15
Battle Arms Development$29.00Battle Arms Development Enhanced Pin Set (BAD-EPS) for the AR15 / M16 / M4 style rifles. The set consists of the Enhanced Take-down Pin (BAD-ETP) and Enhanced Pivot Pin (BAD-EPP). Precision Swiss CNC machined from round stock steel bars,...
