W&S Rapid Fire Kit - for GHK AK GBB Rifle Standard Version

Great product, but only use it with W&S bolt! The normal bolt can slide too far back and thus out of the guide rails on the side (in the position you would put it to take it out of the receiver). If misaligned at "reentry" into the guide rails, the bolt can be seriously damaged. I recommend using the Hephaestus simulation recoil spring guide (enhanced version) as it offers similarly hard recoil without the drawbacks of this product. Cheers