Aero Precision 5.56 Assembled Upper Build Kit w/ Atlas R-One M-LOK Handguard

Why buy a complete rifle, only to discard parts as you customize it? Aero Precision AR-15 Upper Bundles include the three core components: the receiver, barrel, and an extended M-LOK® handguard.

This kit includes:

• Aero Precision mil-spec, flattop, M4-type upper receiver with forward assist and ejection port cover installed
• Laser-engraved T-marks on the Picatinny rail
• M4 feed cuts for reliable feeding
• Ballistic Advantage 16" government-profile 5.56 barrel (gas port drilled for the selected gas system)
• Atlas R-One extended free-floating M-LOK handguard with full-length Picatinny top rail, multiple rows of M-LOK slots, and QD sling swivel sockets at 3, 6, and 9 o'clock positions
• Atlas R-One uses Aero’s Taper Lock Attachment System (ATLAS) with two locking nuts for solid, low-profile mounting

Compatible with mil-spec lowers and many billet AR-15 lower receivers.

Available options:

• Barrel drilled for CARBINE-length gas system
• Barrel drilled for MID-LENGTH gas system

Variant notes:

• The gas system length option changes only how the gas port is drilled; both options use the same 16" barrel.