BLEM UPUR-1LH Left Hand Eject Billet Upper Receiver

Blemished. This part left the line with a cosmetic defect — an anodizing shade variance, a handling mark, or a light machining witness. It is dimensionally in spec and functionally identical to the first-quality part. We do not photograph each one, so the specific mark on the unit you receive is not shown above.

Blems are final sale: no returns and no exchanges for cosmetic reasons, because cosmetics are precisely what you are accepting a discount on. Manufacturing defects are still covered by the normal warranty.

The UPUR-1LH left-hand eject billet upper receiver (blemished) 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 ejection port and bolt clearance are mirrored for a left-hand bolt carrier group.

Configuration

• Forward assist installed boss, machined
• Ejection port cover pin bosses machined
• Left-hand eject; requires a left-hand bolt carrier group and barrel extension
• 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.