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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    LMT Defense - .308 Lower Parts Kit Light - LM308ALPKL - Boss Firearms - BossFirearms.com
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    LMT Defense - .308 Lower Parts Kit Light - LM308ALPKL

    LMT Defense

    Now: $145.80
    Was: $333.00
    By popular demand, we’ve established a lower parts kit less the trigger group.  While our two-stage trigger group is among the best on the market, we realize you may prefer drop-in trigger groups or various other brands out there.  This...
    Now: $145.80
    Was: $333.00
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    LMT Defense - Forward Assist - LMP1115 - Boss Firearms - BossFirearms.com
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    LMT Defense - Forward Assist - LMP1115

    LMT Defense

    Now: $33.39
    Was: $34.47
    LMT Defense Forward Assist. Fits all LMT rifles.     
    Now: $33.39
    Was: $34.47
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  • LMT Defense - MRP Rifle Length Gas Tube - LM308B2E - 815415015064 - Boss Firearms - BossFirearms.com
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    LMT Defense - MRP Rifle Length Gas Tube - LM308B2E

    LMT Defense

    $34.47
    The LMT Defense MRP Rifle Length Gas Tube (LM308B2E) is a genuine LMT replacement gas tube for MWS (.308/7.62 NATO) MRP barrel assemblies. LMT MRP barrels require low-profile gas blocks with straight gas tubes — this rifle-length straight gas tube is the...
    $34.47
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    LMT Defense MRP Mid Length Gas Tube - L7S1B3 - 815415015057 - Boss Firearms
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    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 Operating Method: Direct Impingement Barrel Caliber: 5.56×45, 7.62×51 / .308 Upper Type: MRP Parts
    Now: $33.39
    Was: $34.47
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    LMT Defense - MRP Carbine Length Gas Tube - L7MA1B3 - 815415015040 - Boss Firearms - BossFirearms.com
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    LMT Defense - MRP Carbine Length Gas Tube - L7MA1B3

    LMT Defense

    Now: $33.39
    Was: $34.47
    LMT Defense MRP® gas tube for 5.56 barrels 14.5″ and shorter. Operating Method:Direct Impingement Upper Type: MRP Parts
    Now: $33.39
    Was: $34.47
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    LMT Defense - MRP Pistol Length Gas Tube - L7S1B3BRA - Boss Firearms - BossFirearms.com
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    LMT Defense - MRP Pistol Length Gas Tube - L7S1B3BRA

    LMT Defense

    Now: $33.39
    Was: $34.47
    LMT Defense MRP® gas tube for 300 Blackout Barrels SPECS Operating Method Direct Impingement Barrel Caliber 300 BLK Upper Type MRP Parts
    Now: $33.39
    Was: $34.47
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    LMT Defense - 2 Position Piston Plug - R-L7S1B6CF - 815415016726 - Boss Firearms - BossFirearms.com
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    LMT Defense - 2 Position Piston Plug - R-L7S1B6CF

    LMT Defense

    Now: $48.06
    Was: $49.59
    Drop in replacement part for LMT Gen 2 Piston barrels. Perfect upgrade for existing Estonia Reference Rifles that use 1 position plugs. Note: This part is not compatible with with original LMT piston barrel where the button was on the plug. Please make...
    Now: $48.06
    Was: $49.59
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    LMT Defense - Estonia 5.56 QD Muzzle Device - L8FH3P556E - Boss Firearms - BossFirearms.com
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    LMT Defense - Estonia 5.56 QD Muzzle Device - L8FH3P556E

    LMT Defense

    Now: $67.68
    Was: $69.75
    Flash hider designed for the Estonian Military not only looks sleek and aggressive; it drastically reduces muzzle flash, and allows for quick connector sound suppressors.Suppressor ready flash hider models:1/2x28 TPI for AR-155/8x24 TPI for AR-10 (and...
    Now: $67.68
    Was: $69.75
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    LMT Defense - L129A1 Reference Rifle 7.62x51 Rifle - 16" - LM308SSR - 815415016818 - Boss Firearms - BossFirearms.com
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    LMT Defense - L129A1 Reference Rifle 7.62x51 Rifle - 16" - LM308SSR

    LMT Defense

    $4,476.00
    LMT® reference to the weapon contracted by United Kingdom Ministry of Defence designated the L129A1. This reference weapon brings you as close as you can get to the true rifle system provided to the UK. LMT® patented monolithic Modular...
    $4,476.00
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    Heckler & Koch - MR556 Complete Upper Receiver Kit - 81000584 - 642230262607 - Boss Firearms - BossFirearms.com
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    Heckler & Koch - MR556 Complete Upper Receiver Kit - 81000584

    Heckler & Koch

    $2,069.00
    The MR556A1 Upper Receiver Kit includes a complete upper receiver/barrel assembly, bolt carrier assembly, buffer, and buffer spring allowing most high-quality 5.56 mm AR-style rifles to be retrofitted to HK’s pusher rod system. The Upper Receiver...
    $2,069.00
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    Magpul - Angled Foregrip 2 - MAG414-BLK - 873750003429 - Boss Firearms - BossFireams.com
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    Magpul - Angled Foregrip 2 - MAG414-BLK

    Now: $33.20
    Was: $34.95
    The AFG-2 is a slim line design that is shorter in overall length and width compared to the original AFG. Smaller size allows for mounting on a wider variety of railed hand guards and better compatibility with rail covers and accessory mounts. Compatible...
    Now: $33.20
    Was: $34.95
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    Magpul - MOE M-Lok Handguard - MAG424-BLK - 873750002378 - Boss Firearms - BossFirearms.com
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    Magpul - MOE M-Lok Handguard - MAG424-BLK

    Magpul Industries

    Now: $35.10
    Was: $36.95
    The Magpul MOE M-LOK Hand Guard (Magpul Original Equipment) for AR15/M4 firearms with carbine-length gas systems combines the light weight of a standard hand guard with modular flexibility. Designed with versatility in mind, M-LOK slots at the two, six,...
    Now: $35.10
    Was: $36.95
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