The new Spuhr G3/MP5/HK33/53 Stock Assembly

    The long awaited Spuhr stock assembly for the G3/MP5/HK33/53 is now finally available.

    I tried a fully working prototype during the summer, mounted to the AK4 (HK G3), including the Spuhr hand guard and an Aimpoint. It made the G3 very controllable.

    Photo by Eric Hsueh

    The part number is R-410 and it can be found in the Spuhr webshop: http://spuhrwebshop.com/en/upgrades/r-410.html

    The price is €260.

    Beware that they may not ship to all countries from that webshop, but there may be local distributors.

    The Spuhr stock is a 6-position stock assembly, with a replaceable cheek piece allowing for different sight solutions.

    Photo by Eric Hsueh

    Below: The Spuhr stock assembly collapsed

    The Spuhr stock assembly extended. The length, measured from the rear of the back plate, is between 180-260 mm or 7.09″-10.24″.

    Swedish AK4 (HK G3) with Spuhr hand guard and stock assembly. Atlas bipod, unknown main optics in Spuhr mount and side mounted Aimpoint Micro.

    Below: The Spuhr stock mounted on a HK MP5 with Aimpoint. Note the MP5/HK53 Forend as well, made from billet aluminum.

    Pictures of the prototype mounted on an AK4 (HK G3).

    A picture of a 3D printed prototype (3D Systems SLS) I took last summer, fully functional during testing and after several 1000 shots.

    Note that some of the pictures has the Swedish Armed Forces markings. The commercial model does not have these military markings.

    To install, you have to remove the factory stock from the metal back plate and attach the Spuhr stock adapter using the factory fasteners and the included washer or buffer collet (depending on buffer assembly).

    The stock will fit the Heckler & Koch G3, MP5, HK33 and HK53 provided the firearm has a metal back plate.

    Note the Swedish Armed Forces markings. The commercial model does not have these military markings.

    The weight of the stock assembly is 385 g or 13.6 oz.

    Below: Another picture I took last summer of the Spuhr parts (prototype). With the Spuhr stock you get a very good line of sight with the Aimpoint and excellent recoil control. Having tried this setup I have to say I feel these upgrades as “must haves”, at least the stock will give you a great advantage, but you cannot run the open sights with this solution.

    Luckily we got permission to use Eric Hsueh‘s excellent pictures for this article. Thanks very much, they really look great.

    That Schmidt & Bender really suits the HK G3 really well.

    The G3 in Eric Hsueh’s pictures has the Spuhr slim profile aluminum forend for the HK G3 (and clones).

    It’s made from a single billet of 7075 T651 and very lightweight at 190 grams, which is actually lower that the original plastic.

    The forend comes with Spuhr Interfaces on the bottom and the sides for attaching accessories.

    For more information also check the Spuhr HK G3 upgrade page.

    Again thanks to Eric Hsueh for letting us use his pictures.

    Eric B

    Ex-Arctic Ranger. Competitive practical shooter and hunter with a European focus. Always ready to increase my collection of modern semi-automatics, optics and sound suppressors. TCCC Certified medic.


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