This adapter and extension combo is a direct replacement for the standard fixed AK-type stock. With this adapter installed, the user will have five stock positions, a watertight storage compartment that is accessible from the rear and an ambidextrous single-point sling mount, located near the firearm's receiver. This kit is the adapter/extension only, stock or QD sling-swivel not included. Will fit sheet metal AKM variants only, except the Yugo or the Iraqi Tabuk. The adapter/extension has a mil-spec outer profile and will only accept Colt or Vltor dimensioned buttstocks.