16" M4 contour barrel

5.56 NATO chamber with 1:9 twist rate

A2 front sight gas block

Glacier Guard carbine handguards with heat shield

Effective A2 flash hider

A3 style flat top receiver

Includes bolt carrier group and charging handle

The DPMS AP4 Upper is a lightweight, reliable, and surprisingly affordable upper receiver perfect for your next build. The heart of this upper half is the flat top A3 upper receiver, cut from the same 7075-T6 aluminum as traditional MIL-SPEC receivers. The drop in Glacier Guard handguards feature a effective double heat shields to keep your hands cool during extended strings of fire. This receiver is equipped with a fixed A2 front sight gas block.DPMS Firearms offers a wide variety of AR-10 and AR-15 components as well as complete rifles. Every component is made to strict standards by experts in order to provide you with an accurate and reliable rifle. Founded in 1985, DPMS has been around for a while, so they know what it takes to bring high quality firearms to the market.