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 - HK UMP (.40 S&W/.45 ACP/9mm) Paddle Mag Release - HKP-18773

    HK UMP Paddle Magazine Release

    $9.95
    UMP Paddle Magazine Release - US Made New UMP Mag release. This is a very common repair & replacement part as they are fairly easy to break on the UMP lower. Simple & easy to install no gunsmith needed or required. Compatible With: UMP .45 UMP ...
    HKP-18773
    $9.95
    Out Of Stock
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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.
    HKP-00246
    $0.00
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    Used - H&K 93/33/53 Paddle Magazine Release Set Complete-Used - HKP-00707

    HK33, HK53, HK93 Paddle Magazine Release Set Complete-Used

    H&K Heckler & Koch

    $0.00
    HK 93, HK33, & HK 53 Paddle magazine release set complete all pieces-Used
    HKP-00707
    $0.00
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