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From rare destructive device components like M203 grenade launcher parts and hard-to-find AR-10 builder essentials, to duty-grade field support, premium knives, and precision aiming systems, we supply the equipment required for serious operators, armorers, and enthusiasts. Browse our curated, severe-duty inventory below.

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  • Knights Armament - Piston Assembly - USP Tactical M16x1 LH - #22500 - Boss Firearms - BossFirearms.com
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    Knights Armament - Piston Assembly - USP Tactical M16x1 LH - 22500

    Knights Armament Company

    $774.00
    The Knight's Armament Piston Assembly — USP Tactical M16x1 LH (KAC PN: 22500) is KAC's replacement piston assembly for Heckler & Koch USP Tactical pistols with M16x1 left-hand thread suppressor mounts. This piston component is part of the suppressor...
    $774.00
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    LMT Defense M203 Leaf Sight Handguard Mounted - C-8448330 - Boss Firearms - BossFirearms.com
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    LMT Defense - M203 Leaf Sight Handguard Mounted - 8448330

    LMT Defense

    Now: $175.50
    Was: $180.90
    Leaf Sight for Standard M203 Grenade Launcher. Mounts directly to the standard handguard.  
    Now: $175.50
    Was: $180.90
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    Now: $175.50
    Was: $180.90
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    LMT Defense M203 Leaf Sight L2B/L2X Mounted - LMP391A - Boss Firearms - BossFirearms.com
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    LMT Defense M203 Leaf Sight L2B/L2X Mounted

    LMT Defense

    Now: $243.90
    Was: $251.55
    LMT Defense Leaf sight developed exclusively for use with the LMT® rail mounted M203 launchers.  This sight mounts via the rear rail screw of the launcher receiver.
    Now: $243.90
    Was: $251.55
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    Now: $243.90
    Was: $251.55
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    LMT Defense M203 Rifle Length Mounting Kit - LMP300B - 815415011059 - Boss Firearms - BossFirearms.com
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    LMT Defense M203 Rifle Length Mounting Kit

    LMT Defense

    Now: $440.10
    Was: $461.70
    LMT Defense M203 Mounting hardware kit with leaf sight assembly. Mounts to standard M203 for a standard A2 rifle with 20″ barrel.
    Now: $440.10
    Was: $461.70
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    Now: $440.10
    Was: $461.70
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    LMT Defense M203 Carbine length Mounting Kit - L4B1 - 815415010960 - Boss Firearms - BossFirearms.com
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    LMT Defense M203 Carbine length Mounting Kit

    LMT Defense

    Now: $342.00
    Was: $352.35
    The LMT M203 Carbine Length Mounting Kit mounts to a standard M203 for a standard or M4 type carbine. Includes M203 mounting hardware and leaf sight assembly.
    Now: $342.00
    Was: $352.35
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    Now: $342.00
    Was: $352.35
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  • LMT DEFENSE M203 QD MOUNTING BRACKET - 12973116 - Boss Firearms - BossFirearms.com
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    LMT Defense - M203 Quick Detach Mounting Bracket - C-12973116

    LMT Defense

    MSRP: $348.00
    $322.65
    The LMT Defense M203 Quick Detach Mounting Bracket (C-12973116) is a quick-detach mounting bracket for LMT M203 grenade launcher systems. This QD bracket enables faster installation and removal of the M203 from the host rifle without tools, providing...
    MSRP: $348.00
    $322.65
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    MSRP: $348.00
    $322.65
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    LMT Defense - Short Rail Mount Pistol Grip Frame - L2X1PG - Boss Firearms - BossFirearms.com
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    LMT Defense - Short Rail Mount Pistol Grip Frame - L2X1PG

    LMT Defense

    Now: $823.50
    Was: $940.50
    LMT Defense Short Rail Mounted M203 Grenade Launcher Pistol Grip Frame. Does not include receiver or barrel. Allows for mounting of L2X launchers.
    Now: $823.50
    Was: $940.50
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    Now: $823.50
    Was: $940.50
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  • LMT Defense Barrel Mount Complete Frame - L2H1PG - 815415014807 - Boss Firearms - BossFirearms.com
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    LMT Defense - Barrel Mount Complete Frame - L2H1PG

    LMT Defense

    MSRP: $1,329.00
    $1,232.10
    The LMT Defense Barrel Mount Complete Frame (L2H1PG) is the complete mounting frame for the LMT rail-mounted M203 grenade launcher system. This frame provides the structural mounting interface between the M203 receiver and Picatinny rail, including all...
    MSRP: $1,329.00
    $1,232.10
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    MSRP: $1,329.00
    $1,232.10
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    LMT Defense - Short Rail Mount Complete Frame - L2X1S - Boss Firearms - BossFirearms.com
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    LMT Defense - Short Rail Mount Complete Frame - L2X1S

    LMT Defense

    Now: $1,196.10
    Was: $1,232.10
    Short Rail Mounted M203 Grenade Launcher Complete Frame.  Includes pistol grip and PDW buttstock. Does not include receiver or barrel. Allows for mounting of L2X launcher
    Now: $1,196.10
    Was: $1,232.10
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    Now: $1,196.10
    Was: $1,232.10
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  • Out of stock
    LMT Defense - Full-Auto 5.56 Bolt Carrier - L7D3A - 815415011424 - Boss Firearms - BossFirearms.com
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    LMT Defense - Full-Auto 5.56 Bolt Carrier - L7D3A

    LMT Defense

    $224.55
    The Lewis Machine and Tool AR-15 bolt carrier is a full auto rated, M16 cut carrier designed for long term durability and reliability. The manganese phosphate carrier is machined out of 8620 Carpenter steel and has been magnetic particle inspect to...
    $224.55
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    $224.55
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    LMT Defense - Semi-Auto 5.56 Bolt Carrier - L7A3A - 815415011394 - Boss Firearms - BossFirearms.com
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    LMT Defense - Semi-Auto 5.56 Bolt Carrier - L7A3A

    LMT Defense

    Now: $116.10
    Was: $119.70
    Standard semi auto carrier assembly - carrier only. Does not include the firing pin, cam pin, or firing pin retaining pin. As with all LMT bolts/carriers these are test fired at the factory and will show evidence of such. Weight:0.566 lbs Caliber: ...
    Now: $116.10
    Was: $119.70
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    Now: $116.10
    Was: $119.70
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  • LMT Defense - 5.56 Enhanced Bolt - L7Q3B - Boss Firearms - BossFirearms.com
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    LMT Defense - 5.56 Enhanced Bolt - L7Q3B

    $404.55
    If our standard bolt is the infantryman of the gun industry, then our enhanced bolt is the delta operator.  This bolt was designed to function effectively in full-auto, suppressed, and short barrel weapon systems, and it is made of materials far...
    $404.55
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    $404.55
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