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Custom Arms ST-EF-74 foldable triangle AK stock extender

Custom Arms ST-EF-74 foldable triangular AK stock extender.

  • Made of reinforced fiberglass
  • Basic part adds 2cm (0.78′) length to the buttstock
  • Two additional spacers can add 1cm (0.39′) each
  • Allows stock to fold and lock
  • Uses it’s own locking latch mechanism


Russian made Custom Arms folding stock extender. Basic extender adds 2 cm (0.78′) to the buttstock. Two additional spacers can add 1 cm (0.39′) each. So you can add total 4 cm (1.57′) to buttstock length. The extender allows the stock to fold and lock. It has it’s own locking latch mechanism. Made of fiberglass, so it can take much aduse both in cold and hot enviroment conditions.

Additional information

Weight 0.3 g

Custom Arms



2 reviews for Custom Arms ST-EF-74 foldable triangle AK stock extender

  1. tsuga_silva (verified owner)

    Cheap! Yes it will extend the stock on your KR-9, but it is made of hard plastic with sloppy molding / cheap casting. Screw holes do not line up with existing holes on KR-9 folding stock so you will be drilling about 1/8″ alongside the existing holes to make it fit. Screws that are sent with it are too long, so although not immediately noticeable, they do stick out too far. If there is another option, take it.

  2. custom arms

    Hi! I advise you to read the instructions and product description: the holes must be expanded, they are too small for fasteners. If we took a small size of fasteners, we would not find enough length and it would not withstand the loads. The screws are designed for a different number of spacers from 1 to 3 pieces. That is, this back cover can be equipped with spacers of 1 cm and lengthen it from 2 to 5 cm. After fitting, you saw them off and that’s it. The product description says that it is glass-filled polyamide. This is not a soft material. And the Saiga 9 does not need a shock absorber.

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