The gas piston for the AKM Jack from WBP (Wytwórnia Broni Jacek Popiński) can be used with WBP series weapons, in calibers 7.62×39 and 5.56×45, as well as with many other variants of the AK47 and AKM rifles from various manufacturers. There is a possibility that some weapons may require individual fitting.
WBP is a family-owned company from Poland with an interesting and long-standing tradition. They pride themselves on the high quality of their products and their in-house development and manufacturing. All weapons are produced from the first screw to the last piece of wood in the stock at the WBP family business, so to speak, under one roof. They control the entire production process. About 90% of the one thousand weapons produced monthly at WBP are intended for export to the USA.
All internal components of the weapons must meet precise manufacturing tolerances at WBP. One of the company's main advantages is its collaboration with members of special forces units, who test and provide feedback on the AK/AR systems for the company. This gives the most qualified individuals a voice, and WBP's production and development continue to rise in professional standing and popularity.