If you are looking for new tactical rear stock set up for your M-11 Cobray Semi Auto 9mm, this is for you! This black aluminum stock is only 7-1/5" long and lightweight. Includes an extension tube, sling swivel, foam over tube, and a 1/2" recoil pad. The sling swivel can be relocated to any of four different locations. (photos shows it on lower rear) The stock has been machined to fit with our rear stock adapter designed only for the M-11 Cobray Semi Auto 9mm. This set up will NOT fit Master Piece Arms guns. Includes rear stock adapter, bolt and ACE rear stock, ONLY. (gun & other parts sold separately) NFA rules apply, Addition of this item may require additional paperwork to be filed with the ATF, check with your local dealers.