Parts & Accessories

Parts & Accessories

Shop AR-15 and AR-10 parts and accessories from Boss Firearms. Our parts inventory includes LMT upper and lower receivers, Proof Research carbon fiber barrels, Forward Controls Design components, Geissele triggers, Magpul furniture, BCM parts, SureFire lights, and much more. Whether you're building a new rifle or upgrading your current setup, we carry the hard-to-find components trusted by military, law enforcement, and serious civilian shooters.

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    On Sale
    Sons of Liberty Gun Works - Blaster Starter Kit - #BSK - 691821545995 - Boss Firearms - BossFirearms.com

    Sons of Liberty Gun Works - Blaster Starter Kit - #BSK

    Sons of Liberty Gunworks

    Now: $54.15
    Was: $57.00
    The Sons of Liberty Gun Works AR-15 lower parts kit comes with almost everything you need to finish building your lower receiver. Also known as the blaster starter kit, the only components missing...
    Now: $54.15
    Was: $57.00
    Qty in Cart: 0
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    Now: $54.15
    Was: $57.00
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  • Out of stock
    LMT Defense - 7.62x51mm 13.5" LW Chrome Lined MWS Barrel Assembly - LM308B113

    LMT Defense - 7.62x51mm 13.5" LW Chrome Lined MWS Barrel Assembly - LM308B113

    LMT Defense

    $727.20
    The 13.5-inch lightweight profile .308/7.62x51mm chambered MWS barrel features a chrome lined bore with a 1:10 right hand twist. Designed for the LMT MWS receiver, this barrel utilizes a low-profile...
    $727.20
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    $727.20
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  • Out of stock
    On Sale
    LMT Defense - .300 Blackout 16" Chrome Lined MRP Barrel Assembly - #L7BK1B - Boss Firearms

    LMT Defense - .300 Blackout 16" Chrome Lined MRP Barrel Assembly - #L7BK1B

    LMT Defense

    MSRP: $598.00
    Now: $538.20
    Was: $554.40
    This is a new Lewis Machine & Tool 16-inch .300 Blackout MRP barrel assembly. It features a chrome lined bore with a 1:7 right hand twist. Designed for the LMT monolithic receiver, this barrel...
    MSRP: $598.00
    Now: $538.20
    Was: $554.40
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    MSRP: $598.00
    Now: $538.20
    Was: $554.40
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  • LMT Defense - 5.56mm 11.5" Chrome Lined MRP Barrel Assembly - #L7TA1B - 815415015002 - Boss Firearms - BossFirearms.com

    LMT Defense - 5.56mm 11.5" Chrome Lined MRP Barrel Assembly - L7TA1B

    LMT Defense

    $554.40
    The LMT Defense 11.5" Chrome Lined 5.56mm MRP Barrel Assembly (L7TA1B) is engineered specifically for LMT's Monolithic Rail Platform (MRP) upper receivers. This 11.5-inch, 5.56×45 (.223) barrel...
    $554.40
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    $554.40
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    LMT Defense - 5.56 lower parts kit w/trigger - LM556LPK - 815415016559 - Boss Firearms - BossFirearms.com

    LMT Defense - 5.56 lower parts kit w/trigger - LM556LPK

    LMT Defense

    Now: $313.20
    Was: $322.65
    Complete your build with only the best lower parts kit available. This is the same kit that LMT’s world famous weapons are built with so why wouldn’t you want it in your rifle? 100% American...
    Now: $313.20
    Was: $322.65
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    Now: $313.20
    Was: $322.65
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  • Out of stock
    VLTOR - FAL Rifle Series Handgaurd - #CASV-FAL - Boss Firearms - BossFirearms.com VLTOR - FAL Rifle Series Handgaurd - #CASV-FAS - Boss Firearms - BossFirearms.com

    VLTOR - FAL Rifle Series Handgaurd #CASV-FA

    Vltor Weapon Systems

    $329.95 - $358.95
    The CASV-FAL handguard is designed for the FAL series of rifles. They mount solidly to the standard inch or metric FAL with a short version for the carbine style FALs. It is mounted at the receiver...
    $329.95 - $358.95
    Qty in Cart: 0
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    Unity Tactical Hot Button Light Activation Switch Picatinny Compatible with Surefire Tailcaps Black #HBR-SB

    Unity Tactical Hot Button Light Activation Switch Picatinny Compatible with Surefire Tailcaps Black #HBR-SB

    Unity Tactical

    $119.00
    Hot Button is a revolutionary control device for weapon-mounted electronic accessories. It provides a 45 degree angle button interface for a more natural press angle at any position around a weapon...
    $119.00
    Qty in Cart: 0
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    $119.00
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    LMT Defense - 7.62 NATO barrel assembly 20" Stainless Steel - LM308B220S - 815415011608 - Boss Firearms - BossFireams.com

    LMT Defense - 7.62 NATO barrel assembly 20" Stainless Steel - LM308B220S

    LMT Defense

    MSRP: $947.00
    Now: $852.30
    Was: $877.95
    LMT AR-10 Barrel for use with the LMT MWS upper receivers.  Specifications:  7.62 NATO / .308 20" Stainless steel 1:11.25" RH twist 5R cut Low profile gas block Straight gas tube A2 flash hider
    MSRP: $947.00
    Now: $852.30
    Was: $877.95
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    MSRP: $947.00
    Now: $852.30
    Was: $877.95
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  • LMT Defense - Front Flip Up Sight GEN2 - #L8KG2 - Boss Firearms - BossFirearms.com

    LMT Defense - Front Flip-Up Sight GEN2 - L8KG2

    LMT Defense

    MSRP: $162.00
    $150.30
    The LMT Defense Front Flip-Up Sight GEN2 (L8KG2) is LMT's mil-spec front backup iron sight (BUIS) — NSN issued (NSN: 1005-01-648-5899) and compatible with all LMT rifle sight systems. This flip-up...
    MSRP: $162.00
    $150.30
    Qty in Cart: 0
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    MSRP: $162.00
    $150.30
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  • Out of stock
    Sig Sauer - MCX/MPX Folding Stock - Minimalist Plus - Black - STOCK-X-FOLD-PLUS-BLK - Boss Firearms - BossFirearms.com

    Sig Sauer - MCX/MPX Folding Stock - Minimalist Plus - Black - #STOCK-X-FOLD-PLUS-BLK

    Sig Sauer

    $199.99
    SIG SAUER factory aluminum minimalist plus, folding stock installs easily on your MCX/MPX via the receiver's 1913/picatinny interface. Overall length - 9"Overall height - 4.5"Butt-pad width - ...
    $199.99
    Qty in Cart: 0
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    $199.99
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  • Out of stock
    On Sale
    Knight's Armament - M4/M5 RAS Hardware Kit - 30450 - 819064011026 - Boss Firearms - BossFirearms.com

    Knight's Armament - M4/M5 RAS Hardware Kit - 30450

    Knights Armament Company

    Now: $33.17
    Was: $34.92
    The KAC Medium URX II free floating forend features an integral, flip-up front sight assembly that folds flush with the continuous top rail when not in use, creating a seamless look. Full length...
    Now: $33.17
    Was: $34.92
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    Now: $33.17
    Was: $34.92
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    On Sale
    LMT Defense MRP Mid Length Gas Tube - L7S1B3 - 815415015057 - Boss Firearms

    LMT Defense - MRP Mid Length Gas Tube - L7S1B3

    LMT Defense

    Now: $33.39
    Was: $34.47
    LMT Defense MRP® gas tube for 5.56 16″ barrels and .308 16″ or less barrel. SPECS
    Now: $33.39
    Was: $34.47
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