Includes: FAL Receiver Block (#FALRB), M4 modular stock (M4M (color), CAR stock adapter (#PN), Lock ring (#LR), 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 the stock varies from ~ 8" fully collapsed to 11 3/4 fully extended in six 3/4 increments. This measurement is taken from the front edge of the CAR stock block (#PN), to the mid point of the butt. Fixed stock kit does not include Folding Mechanism (#FSM). 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.