AR-15 Upper for Big Bore Calibers – .450 Bushmaster, .458 SOCOM, .50 Beowulf
If you’re planning a big bore build for your AR-15, one area that often goes overlooked is the upper. The brass from .450 Bushmaster, .458 SOCOM, or .50 Beowulf, won’t fit through a standard AR-15 upper’s ejection port. Luckily, Aero Precision makes a forged upper receiver that solves this issue, with a port door sized for larger brass casings.
The XL Upper is just like your standard forged upper, with two key differences. One, the enlarged ejection port opening, plus a laser-engraved “XL” on the rear tang. Just to make it easy to distinguish from your other upper receivers.
Forged From 7075-T6 Aluminum
Just like the other Aero uppers you can trust, the XL is Type III Class 2 hard coat anodized or finished with Magpul FDE Cerakote. The 7075-T6 aluminum forgings are completely within spec in every other way, ensuring compatibility with other dust covers, forward assists, handguards and more. The only real difference is the ejection port opening, and the distinguishing “XL” on the tang.
Features:
- Port door opening enlarged to enhance larger diameter brass ejection (.450 Bushmaster, .458 SOCOM, .50 Beowulf, etc.)
- Features Laser Marked “XL” designation on the upper receiver tang
- Compatible with AR15 Lower receivers
- Compatible with AR15 Port Doors and Forward Assists
- .250 takedown pin holes
- Includes port door and forward assist
Specifications:
- PLATFORM: AR15
- MATERIAL: Machined from 7075-T6 forged aluminum
- FINISH: Anodized Black or FDE Cerakote
- COMPATIBILITY: Works with all Mil-spec AR15/M16 components
- ENHANCEMENTS: Enlarged ejection port for big bore brass
- WEIGHT: 8.35oz
Products available on this page:
- Aero Precision Assembled XL Upper Receiver for Big Bore AR-15 - Enlarged Ejection Port - (DISCONTINUED) - Black - Color: Black | SKU: APAR611310AC | UPC: 815421027440
- Aero Precision Assembled XL Upper Receiver for Big Bore AR-15 - Enlarged Ejection Port - (DISCONTINUED) - Flat Dark Earth - Color: Flat Dark Earth | SKU: APAR611320AC | UPC: 815421028744
