Aero Precision M4E1 Enhanced Complete Upper 14.5" 5.56 Mid-Length Pinned Epsilon 556SL 12" M-LOK Black

Aero Precision M4E1 Enhanced Complete Upper 14.5" 5.56 Mid-Length Barrel w/ Pinned Epsilon 556SL 12" M-LOK HG - Black This Complete Upper includes Aero's Gen 2 Enhanced Handguard! Key features include the addition of quick disconnect sling sockets, enhanced milling design for grip and visual appeal and a new profile for the picatinny top rail. Aero Precision has taken the pain out of building a legal 14.5" rifle build. These pinned and welded 14.5" complete uppers feature an Epsilon 556SL that is permanently affixed to the muzzle providing an overall legal length of 16". Worried you might want to change your gas block? No worries! The outer diameter of the Epsilon 556SL allows you to easily slide your gas block over the muzzle device making it easy to change or service your gas system. If you've had a 14.5" build planned, but didn't want to deal with the hassle of getting it pinned and welded or being stuck with a specific configuration, then our 14.5 pinned and welded barrels/uppers are for you! Includes: M4E1 Assembled Upper Receiver 12" Gen 2 Enhanced M-LOK Handguard 14.5" 5.56 CMV Barrel Low Profile Gas Block and Mid-Length Gas Tube VG6 Epsilon 556SL (pinned and welded) Product comes assembled This complete upper does not include BCG or Charging Handle. The muzzle brake that comes with this complete upper receiver is pinned this barrel. Per the National Firearms Act, the muzzle brake MUST be pinned and welded to achieve the necessary 16" as defined by the ATF for a rifle build. M4E1 Upper Features: Forged from 7075 T6 aluminum Precision machined to M4E1 specs M4 feedramps Matte black hard coat anodized Mil 8625 Type 3 Class 2 Laser engraved T-marks Comes assembled, with port door and forward assist installed Accepts standard AR15/M16 components Handguard mounting platform is forged into the receiver Works with Aero Precision handguards but also fits most BAR-system handguards Barrel nut and wrench are included Gen 2 Enhanced Handguard Features: 1pc free float design Built in anti-rotation tabs Scalloped rails Continuous top rail 1.78" inside diameter fits most muzzle devices and 1.5" suppressors Compatible with low profile gas blocks Gen 2 Feature - Quick disconnect sling socket at the 3, 6 and 9 o'clock positions Gen 2 Feature - Additional milling along flats to aid with gripping and add visual appeal Gen 2 Feature - New profile for the continuous picatinny top rail 14.5" 5.56 Mid-Length Barrel Features: Chamber: 5.56 Length: 14.5" Twist: 1 in 7 Threading: 1/2"x28 Material: Chrome Moly Vanadium Finish: QPQ corrosion resistant finish both inside and out Gas Block: .750 Gas Port: .0785 Gas System Length: Mid Weight: 26oz M4 Barrel Extension HP and MPI Tested