This is our new NO SHOW rear stock design. It offers a solid stock design and with the folding adapter weighs just over 1.3 lb. with the folding adapter. It measures about 9" from the rear of the receiver. Finished in jet black anodize. Replaces the factory push button OEM parts with a slide in adapter and a threaded, machined inside block. Folding adapter can be switched to fold to the left or to the right. Instructions and Allen wrench included. This adapter fits Mac-10 SMG only. (gun & other parts sold separately) **NEW Flat/Matte black coating.