Heckler & Koch MP5K/SP5K/UMP Folding Stock

Heckler & Koch
$99.00 $90.00
(16 reviews)
Current Stock:
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Heckler & Koch MP5K/SP5K/UMP Folding Stock


Factory Heckler & Koch side-folding stock for H&K MP5K & UMP type rifles as well as all B&T APC model rifles.

OEM Stock for European H&K SP5Ks.


  • MP5K
  • SP5K
  • SP89
  • MP5K Clones & Other Custom Builds
  • B&T APC9 / APC40 / APC45 / APC10 / APC223 / APC308


  • 4
    H&K B&T folding stock

    Posted by Jack on 11th Jan 2023

    A local dealer has this same part for $250, so I was pleased to find the AU price. I had to hit the top and bottom of the hinge with a file a few times so it would fit in my SB Tactical brace mount. After that I drilled the hinge out to the correct size. It is a good fit, very tight lockup. It puts my cheek weld about 3/8" higher than the SB brace but I can still use the iron sights.

  • 5
    HK MP5 UMP folding stock

    Posted by Dan on 8th Dec 2022

    Stock was shipped fast, arrived in great shape and the fit and finish was great ! No issues would purchase again !

  • 5
    Best value $$

    Posted by FVS on 25th Sep 2022

    The real deal. Looking for this quite awhile. Too expensive or OOS everywhere else. Always fast shipping and no nonsense response on email inquiries.

  • 5
    UMP Stock

    Posted by Anthony Trahan on 11th Apr 2021

    AU has the best price and fast shipping. Stock fits amazing on my SP5k with the B&T adapter

  • 5
    Great Price / Authentic Product / Perfect Fitment

    Posted by Peter Fong on 8th Apr 2021

    Fast shipping, HK quality and superb price.

  • 5

    Posted by CR on 30th Mar 2021

    Just what I needed for my A3 tactical adapter for my Scorpion. Item was in great shape, like new!

  • 5
    HK SP5k stock

    Posted by Alfred Lozano on 15th Feb 2021

    Fits great and looks great!

  • 5
    HK ump folding stock

    Posted by Devan Foshee on 11th Feb 2021

    Usual great products from HK and great price and service from Arms Unlimited

  • 5
    Mp5 stock

    Posted by bd on 10th Jan 2021