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Spikes Tactical Upper Receiver STU5035-R9S
5.56mm NATO (accepts .223 Remington)
16" barrel
Chrome-moly vanadium mil-spec barrel
1:7" Twist
Mid-length gas system
Low-profile gas block
Spikes Tactical mil-spec M16 bolt carrier group
12" length SAR3 free float rail system
A2 Flash hider
Upper receiver is 7075-T6 forged flatto