AR-15 Parts

AR-15 Parts

Shop our extensive inventory of AR-15 parts and modern sporting rifle (MSR) components. From fully assembled MIL-SPEC upper receivers and enhanced lower parts kits to free-float M-LOK handguards and ambidextrous controls, we carry the critical components required for duty, defense, and custom builds.

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  • Out of stock
    LMT Defense- Purchase the MRP-L MLOK 9.25" AR15 Upper Receiver #L7X1A get the Lower Receiver #M7SL for FREE

    LMT Defense- Purchase the MRP-L MLOK 9.25" AR15 Upper Receiver #L7X1A get the Lower Receiver #M7SL for FREE

    LMT Defense

    $989.00
    Upper Receiver:  The patented LMT monolithic rail platform (MRP) upper receiver, has a receiver and handguard that are made from a single piece of aerospace grade aluminum. The barrel is held in place with a proprietary locking system that utilizes...
    $989.00
    Qty in Cart: 0
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    $989.00
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  • Out of stock
    LMT Defense- Purchase the MRP-L MLOCK 13.25" AR15 Upper Receiver #L7Y1A get the Lower Receiver #M7SL for FREE

    LMT Defense- Purchase the MRP-L MLOCK 13.25" AR15 Upper Receiver #L7Y1A get the Lower Receiver #M7SL for FREE

    LMT Defense

    $1,045.00
    Upper Receiver: The patented LMT monolithic rail platform (MRP) upper receiver, has a receiver and handguard that are made from a single piece of aerospace grade aluminum. The barrel is held in place with a proprietary locking system that utilizes two...
    $1,045.00
    Qty in Cart: 0
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    $1,045.00
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  • Ruger - 10/22 Stripped Aluminum Receiver - SCU-0129 Ruger - 10/22 Stripped Aluminum Receiver - SCU-0129

    Ruger - 10/22 Stripped Aluminum Receiver - SCU-0129

    Ruger

    $65.00
    This is a new Ruger factor stripped aluminum receiver compatible with 10/22 pattern firearms.  Black Stripped Made in the USA Note: These are stripped receivers so they will not come with any internal components. Being a serialized item, an...
    $65.00
    Qty in Cart: 0
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    $65.00
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  • Out of stock
    Knight's Armament - Aimpoint Micro 45 Degree Offset Rail Mount - 115601 - 819064018391 - Boss Firearms - BossFirearms.com

    Knight's Armament - Aimpoint Micro 45° Offset Rail Mount - #115601

    Knights Armament Company

    MSRP: $163.72
    $156.43
    The KAC 45 Degree Offset Aimpoint Micro Mount is intended to be attached to either the 3 o’clock or 9 o’clock rail position, placing the red dot to the side of a primary optic at a 45-degree angle. A quick roll of the rifle is all...
    MSRP: $163.72
    $156.43
    Qty in Cart: 0
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    MSRP: $163.72
    $156.43
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  • Out of stock
    On Sale
    LMT Defense 5.56mm 14.5" Piston MRP Barrel Assembly - L7NC1B - 815415016788 - Boss Firearms

    LMT Defense 5.56mm 14.5" Piston MRP Barrel Assembly

    LMT Defense

    Now: $695.70
    Was: $716.85
    Lewis Machine & Tool piston operated 14.5-inch MRP barrel chambered for .223/5.56mm. It features a 1/2x28 threaded A2 birdcage flash hider, two-position adjustable gas block for suppressed and unsuppressed firing, and a chrome lined bore with a 1:7...
    Now: $695.70
    Was: $716.85
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    Now: $695.70
    Was: $716.85
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  • Out of stock
    LMT Defense 5.56 Full Auto Piston Bolt Carrier Group - L7D3CP - Boss Firearms

    LMT Defense 5.56 Full Auto Piston Bolt Carrier Group - L7D3CP

    LMT Defense

    $468.00
    This is a new Lewis Machine & Tool 5.56 piston AR15 bolt carrier group for use in piston-operated systems. It features optimization for use in short-barreled rifles.
    $468.00
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    $468.00
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  • BT Atlas - V8 Atlas Bipod - BT10 -  810040220081 - Boss Firearms - BossFirearms.com BT Atlas - V8 Atlas Bipod - BT10 -  810040220081 - Boss Firearms - BossFirearms.com

    BT Atlas - V8 Atlas Bipod - BT10

    BT Atlas

    $299.95
    The BT10 V8 Atlas Bipod mounts directly to any 1913 style Picatinny rail via a low profile two screw clamp assembly. It is comprised of 6061-T6 aluminum that is Mil-Spec Type III hard coat anodized and have heat treated stainless steel components...
    $299.95
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    $299.95
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  • Out of stock
    Knight's Armament - Like New 5.56 QDC 3-Prong Flash Suppressor Kit - 1/2"-28 TPI - 30555-Like-New - 819064010944 - Boss Firearms - BossFirearms.com Knight's Armament - Like New 5.56 QDC 3-Prong Flash Suppressor Kit - 1/2"-28 TPI - 30555-Like-New - 819064010944 - Boss Firearms - BossFirearms.com

    Knight's Armament - Like New 5.56 QDC 3-Prong Flash Suppressor Kit - 1/2"-28 TPI - 30555-Like-New

    Knights Armament Company

    $89.00
    These are in like-new condition, they were new rifle takeoffs. The KAC 3-Prong Flash Eliminator is an extremely effective flash suppressor design that also serves as a platform for attaching a Knight’s Armament Quick Disconnect Coupler (QDC) sound...
    $89.00
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    $89.00
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  • Out of stock
    Knight's Armament - DOD Surplus M16 M5 RAS Forend Assembly w/ No Rib Rail Panels - 98065-1-DOD - Boss Firearms - BossFirearms.com Knight's Armament - DOD Surplus M16 M5 RAS Forend Assembly w/ No Rib Rail Panels - 98065-1-DOD - Boss Firearms - BossFirearms.com

    Knight's Armament - DOD Surplus M16 M5 RAS Forend Assembly w/ No Rib Rail Panels - #98065-1-DOD

    Knights Armament Company

    $400.00
    DOD Surplus Stock KAC M5 RAS (Rail Adapter System) was developed for use on the US military's M16A4, and with hundreds of thousands of rails issued to date, it is one of the most battle proven designs available for the AR-15 platform. This non-free...
    $400.00
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    $400.00
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  • Out of stock
    Knight's Armament - DOD Surplus M16 M5 RAS Forend Assembly - 98065-DOD - Boss Firearms - BossFirearms.com Knight's Armament - DOD Surplus M16 M5 RAS Forend Assembly - 98065-DOD - Boss Firearms - BossFirearms.com

    Knight's Armament - DOD Surplus M16 M5 RAS Forend Assembly - #98065-DOD

    Knights Armament Company

    $400.00
    DOD Surplus Stock KAC M5 RAS (Rail Adapter System) was developed for use on the US military's M16A4, and with hundreds of thousands of rails issued to date, it is one of the most battle proven designs available for the AR-15 platform. This non-free...
    $400.00
    Qty in Cart: 0
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    $400.00
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  • LMT Defense - .308 Piston Bolt Carrier Group -  R-LM308DPS - 815415016658 - Boss Firearms - BossFirearms.com LMT Defense - .308 Piston Bolt Carrier Group -  R-LM308DPS - 815415016658 - Boss Firearms - BossFirearms.com

    LMT Defense - .308 Piston Bolt Carrier Group - R-LM308DPS

    LMT Defense

    MSRP: $762.00
    $706.50
    The LMT Defense .308 Piston Bolt Carrier Group (R-LM308DPS) is the large-frame 7.62x51mm NATO piston BCG designed for LMT's MRP-H piston-operated AR-10/MWS platform. Built with the same materials and design principles as LMT's acclaimed 5.56mm piston...
    MSRP: $762.00
    $706.50
    Qty in Cart: 0
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    MSRP: $762.00
    $706.50
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  • Out of stock
    On Sale
    VLTOR - MPX 12" Handguard w/ M-LOK System - #VWS-MPX-12

    VLTOR - MPX 12” Handguard w/MLock System - #VWS-MPX-12

    Vltor Weapon Systems

    Now: $188.96
    Was: $209.95
    Lightweight Easy to install Direct replacement for factory hand guard
    Now: $188.96
    Was: $209.95
    Qty in Cart: 0
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    Now: $188.96
    Was: $209.95
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