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 WORKHORSE 4in Free Float Rail M-LOK
Battle Arms Development$120.00The WORKHORSE® M-LOK® compatible rail system was designed to be a lightweight and slimline option to be used on MIL-SPEC carbines available on the market today. With M-LOK® mounting options at the 3.6, and 9 o'clock positions and... -
BATTLEARMS Carbon Fiber HeatShield
Battle Arms Development$79.00Designed for use with WORKHORSE® rail system. Protect hands from barrel heat. Molded design for a perfect fit Easy to mount. Lightweight 35-50 Carbon Fiber Hand-made in the USA. -
BATTLEARMS AR10/LR308 - Ejection Port Cover Pin
Battle Arms Development$3.50The machined steel Ejection Port Cover Rod is the hinge pin that keeps the Ejection Port Cover in place. Unlike the AR15 version, it needs no c-clip. -
BATTLEARMS AR10/LR308 Ejection Port Cover Door
Battle Arms Development$9.00.308 ejection port door to build out your stripped .308 upper. Works with .308 upper receivers Door Constructed from Stamped Steel Mil-Spec Heavy Phosphate Coating Weight: .53oz -
BATTLEARMS AR15/M16 - Ejection Port C-Clip
Battle Arms Development$1.00AR15/M16 - Ejection Port C Clip These high quality components will provide excellent fit and reliable function in your AR series rifle and are perfect for upgrading existing components or replacing worn or broken parts. -
BATTLEARMS AR15/M16 - Ejection Port Cover Spring
Battle Arms Development$1.00AR15/M16 - Ejection Port Cover Spring These high quality components will provide excellent fit and reliable function in your AR series rifle and are perfect for upgrading existing components or replacing worn or broken parts. -
BATTLEARMS AR15/M16 - Ejection Port Cover Door
Battle Arms Development$6.00AR15/M16 - Ejection Port Cover Door - No Clip,Pin or Spring These high quality components will provide excellent fit and reliable function in your AR series rifle and are perfect for upgrading existing components or replacing worn or broken parts. -
BATTLEARMS Custom Design Engraved Ejection Port Cover
Battle Arms Development$15.95Custom Shop - Laser Engraved Dust Covers / Ejection Port Covers Single AR15/M16 Dust Cover Engraving On Inside Of Dust Cover No hardware included. Does Not Include Spring Ejection Port Rod Ejection Port Rod C-Clip -
BATTLEARMS Caliber Engraved Ejection Port Cover
Battle Arms Development$15.95Custom Shop - Laser Engraved Dust Covers / Ejection Port Covers Single AR15/M16 Dust Cover Engraving on Inside of Dust Cover. No hardware included. Does Not Include Spring Ejection Port Rod Ejection Port Rod C-Clip -
BATTLEARMS AR15/M16 - Ejection Port Cover Assembly
Battle Arms Development$7.99AR15/M16 Ejection Port Cover Assembly Includes: Ejection Port Cover Door Ejection Port Cover Rod with c-clip Ejection Port Cover Spring -
BATTLEARMS WORKHORSE Upper 16in 5.56 NATO 1:7 15in M-LOK - Without BCG or CH
Battle Arms Development$524.00Barrel:Rosco Manufacturing 16in 4150V Chrome Moly Vanadium steel barrel, chambered in 5.56 NATO, with a 1:7 twist, M4 barrel extension, and a Mid-length gas system. The barrel is finished with a .750" diameter low-profile gas block, WORKHORSE 15in M-Lok... -
BATTLEARMS BCG or CH WORKHORSE® Upper 10.5in 5.56 NATO 1:7 9.5in M-LOK® - Without BCG or CH WORKHORSE Upper 10.5in 5.56 NATO 1:7 9.5in M-LOK - Without BCG or CH
Battle Arms Development$529.99Barrel: Rosco Manufacturing 10.5in 4150V Chrome Moly Vanadium steel barrel, chambered in 5.56 NATO, with a 1:7 twist, M4 barrel extension, and a Mid-length gas system. The barrel is finished with a .750" diameter low-profile gas block, WORKHORSE 9.5in... -
BATTLEARMS WORKHORSE Complete Rifle Lower with B5 Bravo Stock
Battle Arms Development$399.99his complete WORKHORSE Rifle Lower with B5 Systems Bravo Stock is fully assembled and ready for your rifle upper.SKU: WH-LR-R-B5UPC: 810033783913Manufacturer: Battle Arms Development, Inc.Receiver Model: WORKHORSE® (Forged)Type: Semi-Auto... -
BATTLEARMS Billet Dedicated Pistol Caliber Upper Receiver 7075-T6
Battle Arms Development$259.95The Battle arms development dedicated PCC upper was designed to be a lightweight and rugged option when it comes to pistol caliber upper receiver groups. Even though it is matched perfectly with our XIPHOS™ lower receiver, this upper receiver will... -
BATTLEARMS BAD556-LW Lightweight 7075-T6 Billet Upper Receiver
Battle Arms Development$529.95Specifications: Precision CNC from Billet 7075-T6 Aerospace Aluminum Patent Pending Lightweight Design M4 Feed Ramp Machined T-Marks Laser Engraved Logo MIL-A-8625F, Type III, Class 2, Hard Anodized Flat Black Finish Compatible with TDP/Mil Standard AR... -
BATTLEARMS WORKHORSE Forged Upper Receiver
Battle Arms Development$120.00Made from 7075 - T6 aluminum Type III hard coat anodized Matte black finish Top notch cut to match WORKHORSE and RIGIDRAIL aesthetic M4 Feed Ramp -
BATTLEARMS WORKHORSE Forged Lower Receiver
Battle Arms Development$125.00Quality Aerospace 7075-T6 Aluminum Alloy MIL-A-8625F, Type III, Hard Anodized Flat Black Finish Compatible with TDP/Mil-Standard AR Lower Receiver Parts Broached Magazine Well Pictograph Selector Markings Properly Marked for... -
BATTLEARMS Development Authority Elite Ambidextrous Lightweight Billet AR-15 Lower Receiver Black
Battle Arms Development$359.00Battle Arms Development Authority Elite Ambidextrous Lightweight Billet AR-15 Lower Receiver Black The Battle Arms Development Authority Elite Ambidextrous Lightweight Billet Lower Receiver is built for AR-15 builders who want a premium lower receiver... -
BATTLEARMS WORKHORSE Forged AR15 Lower Receiver
Battle Arms Development$125.00Workhorse® Forged 7075-T6 AR15 Lower Receiver (Stripped) is a rugged and reliable foundation for custom AR15 builds. Manufactured from high-strength 7075-T6 forged aluminum, this lower receiver delivers excellent durability, structural integrity, and... -
BATTLEARMS Ambidextrous Upgrade Combo Kit RACK-15 and BAD-ASS-PRO for AR15 / M4 / M16 / AR9
Battle Arms Development$169.95The Battle Arms Ambidextrous Upgrade Combo Kit is a premium control enhancement package designed for shooters who want faster manipulation, improved versatility, and better overall rifle handling. Combining the RACK-15 charging handle with the...
