If you have been looking for a custom side folding stock for your Master Piece Arms 9mm gun, this is it! It offers our own designed rear stock, sling swivel loop, Ace folding mechanism and one of our billet rear stock adapters. Installs easily with an Allen wrench (provided) and a button head bolt. It can also be mounted to fold to the left. Your gun may require a tax stamp to register it as an SBR, please check with your local FFL for clarification. This part number only fits Master Piece Arms 9mm pistols and rifles. (gun and other parts sold separately) Fits MPA 9mm, also fits Mini 930.