This is a UTG PRO AR-15 Ops Ready S4 Mil-spec Stock Kit molded from impact resistant high strength matte black polymer. It is complete with Mil-spec extension tube" buffer" buffer spring" receiver end plate" and castle nut. Its unique 4.28" length with 4 position adjustability provides comfortable length of pull and ease of shouldering firearm when wearing a load bearing vest or plate carrier system. It is built for heavy duty use with the tightest tolerance controls to provide the most secure fit and function. Flat dark earth finish.

Features:
FDE finish
Ops ready S4
Mil-spec stock kit
Compact
Includes extension tube, buffer, buffer spring, receiver end plate & castle nut
Fits AR-15