Includes: FAL Receiver Block (#FALRB), folding stock mechanism (FSM). Skeleton Stock (#AKFX(length)), 1/2" Recoil Pad (RP1/2), 1 1/4" ambi sling mount (#UM 1.25) and all hardware needed to install this stock. No modifications to your FAL are necessary. Length of Stock is measured from the back edge of the receiver block to the end of the stock butt, with recoil pad installed. All ACE FAL folding and fixed stock sets require buying and converting your FAL to a "Para" type recoil system, not included, and not currently available through ACE.