M5E1 upper receiver is a one-piece design combining the handguard mounting platform with the upper itself. They have condensed the parts needed to mount a free-floated handguard to a mere 8 screws. Since the handguard mounting surface and upper are of the same forging, not only is it a stronger system, but we are able to make additional lightening cuts to save weight and allow for more efficient cooling.
 
Ease of installation - Simply insert your barrel assembly into the M5E1 upper, tighten it using the included barrel nut and slide your rail on and tighten the rail screws. Within minutes you have a modular, free-floated rail.
 
Features:
M4 Feedramps
.2795 takedown pin holes (DPMS size)
Laser engraved T-marks
Comes assembled, with dust cover and forward assist installed
 
M5E1 Specific Details:
Handguard mounting platform is forged into the receiver
Works with Aero Precision M5 Enhanced Handguards
Barrel nut included
Torque to 65 ft. lbs. with a standard AR15 Armorer’s Wrench