Receivers / Flats / Uppers

Receivers / Flats / Uppers

Explore our premier selection of HK receivers, flats, and uppers at HKParts, perfect for building or upgrading your Heckler & Koch firearms. Our products feature precision-engineered MP5 receiver flats, HK 416 complete upper assemblies, and a wide range of custom options designed for tactical and precision shooting. Whether you are customizing an MP5, upgrading an HK416, or constructing a new firearm, our high-quality components provide unparalleled reliability and performance.

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    New - MM HK 21 (7.62x51/.308) Trunnion - HKP-00246 MM HK 21 (7.62x51/.308) Trunnion

    MM HK 21 (7.62x51/.308) Trunnion

    H&K Heckler & Koch

    $0.00
    US Made HK21 Trunnion By Michael's Machine (MM) These are the finest US-made trunnions available.
    $0.00
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    New - MM HK 23E (5.56/.223) Complete Feed Mechanism - HKP-17578

    HK23E Feed Mechanism - Complete - 5.56 / .223

    Michaels Machines

    $3,999.95
    MM HK 23E (5.56/.223) Complete Feed Mechanism New US manufactured HK23E feed mechanism complete with top plate and push pin. The complete unit a great spare to have on hand.  Compatible With: Factory HK23E and MM23E firearms
    $3,999.95
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