Upper Receiver

Upper Receiver

Find the exact complete or stripped AR-15 upper receiver for your next build. We stock forged and billet uppers, cold hammer-forged barrels, low-profile gas blocks, and advanced bolt carrier groups (BCGs) engineered for extreme reliability and sub-MOA accuracy.

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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...
    $34.47
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    $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
    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.
    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
    Now: $33.39
    Was: $34.47
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    Now: $33.39
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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...
    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...
    Now: $67.68
    Was: $69.75
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    Was: $69.75
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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...
    $2,069.00
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    $2,069.00
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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...
    Now: $35.10
    Was: $36.95
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    Magpul - MOE M-Lok Forend Remington 870 - MAG496-BLK - 873750004563 - Boss Firearms - BossFirearms.com
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    Magpul - MOE M-Lok Forend Remington 870 - MAG496-BLK

    Magpul Industries

    Now: $28.45
    Was: $29.95
    The MOE M-LOK Forend is a drop-in replacement for the standard Remington 870 12ga shotgun, featuring an extended length and front/rear hand stops for improved weapon manipulation. Now updated with...
    Now: $28.45
    Was: $29.95
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    Q - Cherry Bomb Muzzle Brake - CB-1/2-28 - 860248000435 - Boss Firearms - BossFirearms.com
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    Q LLC - Cherry Bomb Muzzle Brake - CB-1/2-28

    Q LLC

    Now: $90.00
    Was: $100.00
    Q Cherry Bomb muzzle brake chambered for 7.62mm rifles that is compatible with the THUNDER CHICKEN and trash PANDA silencers by Q. It features a taper mount shoulder to align with Q barrels and...
    Now: $90.00
    Was: $100.00
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    Now: $90.00
    Was: $100.00
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    Q - Bottle Rocket Enhanced Muzzle Brake - BR-QUICKIE - 860248000442 - Boss Firearms - BossFirearms.com
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    Q LLC - Bottle Rocket Enhanced Muzzle Brake - BR-QUICKIE

    Q LLC

    Now: $89.00
    Was: $99.00
    The Q Bottle Rocket is an enhanced brake for use with our Cherry Bomb muzzle brake. On top of that, it also serves as a sexy-ass thread protector for your Cherry Bomb when not hosting a silencer.As...
    Now: $89.00
    Was: $99.00
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    Now: $89.00
    Was: $99.00
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    LMT Defense M203 Rail Mounted Leaf Sight - LMP390A - 815415015798 - Boss Firearms - BossFirearms.com
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    LMT Defense - M203 Rail Mounted Leaf Sight

    LMT Defense

    Now: $243.90
    Was: $251.55
    LMT Defense M203 rail mounted leaf sight. This sight is used for the M203 40mm grenade launcher and is used to be mounted to either the grenade launcher itself or mounted to the firearm the granade...
    Now: $243.90
    Was: $251.55
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    Now: $243.90
    Was: $251.55
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