Aero Precision M4E1 Threaded 16" 5.56 Mid-Length Complete Upper Receiver with ATLAS R-ONE Handguard, Adjustable Gas Block, VG6 Epsilon Muzzle Device, BREACH Charging Handle, & PRO Series BCG - Anodized Black - APSL100388

Aero Precision APSL100388: This complete upper includes Aero Precision's new ATLAS R-ONE Handguard! The R-ONE handguards are designed with size and weight in mind, while still providing plenty of real-estate to accommodate any attachment needs the end user may have. Aero Precision's proprietary ATLAS attachment system is a durable and dependable mounting platform, maintaining a slim profile while still providing the strength and stability customers have grown to love from Aero Precision handguards.

Includes:

• M4E1 Threaded Assembled Upper Receiver
• 15" ATLAS R-ONE Handguard
• 16" 5.56 CMV Barrel
• Low Profile Adjustable Gas Block and Mid-Length Gas Tube
• VG6 Epsilon Muzzle Device
• BREACH Charging Handle
• PRO Series 5.56 BCG
• Product comes assembled

M4E1 Threaded Upper Receiver Features:

• New enhanced forging that gives the upper receiver a "billet look"
• New picatinny profile that blends seamlessly with our Enhanced Series Handguards
• M4 Feedramps
• .250 takedown pin holes
• Laser engraved T-marks
• Includes port door and forward assist installed

ATLAS R-ONE Handguard Features:

• Full top picatinny rail for optional attachments
• Quick disconnect sling socket at the 3, 6 and 9 o'clock positions
• Compatible with low profile gas blocks
• 1.3” Inside diameter
• 1.5” Outside diameter
• Compatible with mil-spec AR15 upper receivers and barrels

16" 5.56 Mid-Length Barrel Features:

• 5.56 NATO 16" Midlength, 1/7 twist, 4150 CrMoV, QPQ, gas port drilled
• .750 gas block journal
• Mid-length gas system, .0785 gas port
• M4 Feed Ramp Extension
• HP and MPI tested
• VG6 Epsilon Muzzle Device