LBE Unlimited Assembled AR-15 Upper Receiver

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Battle Arms Development WH556-URS-ODG Workhorse Upper Receiver Aluminum OD Green Anodized Receiver for AR15/M4

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Radian Weapons R0027 Complete Upper 300 Blackout 9" Black Barrel, 7075-T6 Aluminum Radian Black Receiver, Extended with Magpul M-LOK Handguard for AR-15