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This is a Rock River Arms R4 Entry Tactical Complete AR-15 Upper Receiver. For those looking for a no frills, all business tactical carbine upper receiver, Rock River has what you're looking for. This upper is equipped standard with R4 double heat-shielded handguards and front sight tower, as well as a forged flattop A4 receiver to permit the mounting of optic sights or scopes. The barrel is 16" chrome-moly steel with a 1 in 9 twist rate, along with an R4 profile and standard A2 flash suppressor. Comes complete with semi-auto bolt and bolt carrier, simply install on your standard AR-15 lower and shoot away! Manufactured in the USA.
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