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Features and Specifications:
Manufacturer Number: STU5025-R9S
Spikes Tactical Upper Receiver
5.56mm NATO (accepts .223 Remington)
16" M4 profile barrel
Cold hammer forged, Chrome-moly vanadium mil-spec barrel
1:7" Twist
Carbine Length gas system
Low profile gas block
Spikes Tactical mil-spec M16 bolt carrier group
9" mid-length BAR 2 free float rail system
A2 Flash hider
Upper receiver is 7075-T6 forged flattop
Made in the USA
Weighs 6 lbs
Fits:
Standard AR-15 lowers