Forged from 7075-T6 aluminum, this assembled upper is precision machined to mil-spec M16/M4 specifications and features an enlarged ejection port. The enlarged ejection port is for reliable function with wide cartridges such as 9mm, 40 S&W, 45 ACP, 10mm, 7.62x39, 6.5 Grendel, .458 SOCOM, .450 Bushmaster, .50 Beowulf, etc.
Bexar Arms offers receiver face squaring for an additional $10 charge. More information on receiver squaring can be found below.
- Port door opening has been enlarged to fit wide cartridges such as 9mm, 40 S&W, 45 ACP, 10mm, 7.62x39, 6.5 Grendel, .458 SOCOM, .450 Bushmaster, .50 Beowulf, etc.
- Works with AR15 lower receivers
- .250 takedown pin holes
- Laser engraved T-marks
- "XL" portion of Aero Logo on Tang
- Compatible with AR15 port door and forward assist
- 100% Made in USA
Squaring the Receiver Face
At Bexar Arms, we offer you the option to have the face of your receiver squared. Squaring the face of the receiver is an essential step in accurizing your AR pattern rifle, and ensures your barrel seats firmly and completely with the receiver face and is perfectly inline with the BCG raceway in the upper. This allows for a more consistent bolt engagement which evenly distributes force among all of your bolt lugs instead of only a few. This consistent lockup and complete barrel seating can help increase your AR's maximum accuracy potential as well as extend the life of your bolt. While squaring your receiver face is 100% unnecessary for your rifle to function, if you're looking to squeeze the absolute most performance out of your AR pattern rifle, we highly recommend it!
5 Reviews Hide Reviews Show Reviews
Excellent fit with the 50 beowulf barrel from Davidson defense and handguard from Firefield.
Aero is top notch. Bexar was fast with my shipment. Just wish they had more stuff in stock so I can support a small business.
As described thanks for fast shipping
I'm still in the middle of a Franken gun build but this upper should do well on my 40 s&w build. Shipping was faster than what I'd expect in these covid days. And there was a nice personal touch on my invoice where they thanked me for my purchase. An should I have issues don't be afraid to reach out to them. I'll definitely continue to do business with you guys.
As advertised, high quality and I would have never thought to face the barrel end, Thank you for making it known, great job BTW. Raymond