UPUR-1A Billet Upper Receiver - 458 SOCOM Compatible
Billet AR-15 upper receiver, relieved for .458 SOCOM and other large-bore cartridges. Forward assist, ejection port cover. Not serialized — ships direct to you.
Limit 5 per order.
Part no. CMT-UPUR-1A
The UPUR-1A billet upper receiver is machined from 7075-T6 billet aluminum and finished in black Type III hardcoat. The barrel extension bore and the receiver face are cut in the same setup, so the barrel seats square and the extension indexes without the witness-mark guesswork that comes with a receiver machined in two operations. The port and feed path are opened up for large-bore cartridges such as .458 SOCOM.
Configuration
- Forward assist installed boss, machined
- Ejection port cover pin bosses machined
- Standard right-hand eject
- Flat-top MIL-STD-1913 rail, T-marked
- Accepts any free-float handguard that uses a standard barrel-nut thread
What is not included
This is a stripped upper receiver. Barrel, bolt carrier group, charging handle, forward assist and ejection port parts are sold separately. It is not a firearm and does not require a transfer.
Installation. Support the receiver in a vise block designed for uppers. Torque the barrel nut to the handguard manufacturer's value and confirm gas-tube alignment before firing.
| Platform | AR-15 |
|---|---|
| Receiver type | Stripped upper receiver |
| Serialized | No — ships direct to you |
| Top rail | Flat-top MIL-STD-1913, T-marked |
| Forward assist | Yes |
| Ejection port cover | Provision machined |
| Ejection | Right-hand |
| Charging | Rear |
| Large bore | Relieved for .458 SOCOM and similar |
| Material | 7075-T6 billet aluminum |
| Finish | Type III hardcoat anodize (MIL-A-8625 Type III, Class 2), black |
| Origin | Machined in Tennessee, USA |