Aero Precision M4E1 Threaded PRO 12.5" CHF 5.56 M-LOK Midlength Complete Upper
Out of stock
The PRO Upper Receiver Group built around our PRO 5.56 Cold Hammer Forged Barrel that is paired with our PRO 5.56 BCG. Included ATLAS R-ONE Handguard, BREACH Charging Handle, and VG6 Delta muzzle device round this assembly out into a premium turnkey solution for your next build.
NOTICE: The muzzle device on this upper receiver is not pinned or welded. All NFA rules and regulations apply.
Includes:
- 12.5″ PRO 5.56 Cold Hammer Forged Barrel
- PRO 5.56 Bolt Carrier Group
- M4E1 Threaded Upper Receiver
- ATLAS R-ONE Handguard
- VG6 Delta Flash Hider
- Mid-Length Gas System
- AR15 BREACH® Ambi Charging Handle w/ Large Lever – Black
About Cold Hammer Forging
Cold hammer forging differs from other common barrel manufacturing processes. Rather than drilling a blank and using cutters, buttons, and reamers to machine the chamber and rifling into the barrel, a cold hammer forged barrel is made by forming the barrel around a mandrel that has the rifling inclusions precision ground into it. This process is referred to as “cold” hammer forging because the process is done at room temperature and the metal is not heated.
| Weight | 56.3 oz |
|---|---|
| Dimensions | 24.5 × 5 × 5 in |
| Barrel Finish | Nitride / Melonite |
| Barrel Profile | Government / SOCOM |
| Gas System Length | Midlength |
| Barrel Length | 12.5 |
| Cartridge Compatibility | 5.56 NATO |
| Twist Rate | 1-7 |
| BCG / Charging Handle | Included |
| UPC | 17435 |
Compliance
NFA (National Firearms Act) compliance is crucial for legal ownership and transfer of regulated firearms and accessories like short-barreled rifles, suppressors, and certain types of ammunition, ensuring adherence to federal regulations to avoid legal penalties and ensure responsible firearm ownership.
