9MM0362X Rock River Arms 10.5" Chrome Moly A4 Pistol Upper Half 9mm CALIBER 9mm Luger Chamber UPPER RECEIVER Forged A4 BARREL Chrome Moly 10.5", 1:10 Twist MUZZLE DEVICE A2 Flash Hider / 1/2x36 TPI HANDGUARD...

CALIBER .223/5.56 UPPER 10.5 Inch Chrome Moly A4 Pistol Upper Half BOLT CARRIER GROUP Chromed Bolt Carrier Group HANDGUARD Standard R4 CHARGING HANDLE Standard Charging Handle GAS BLOCK Gas Block Sight Base...

This is the shortest upper you can get from RRA. These uppers are custom made for us by Rock River Arms master gunsmiths. The barrel is 14" in length with a perminently affixed extended A2 flash hider for a legal total...

16 inch 1:8 Bead Blasted Bull Barrel A4 Varmint Upper Half, .223/5.56, complete with bolt, charging handle, Hogue Free Float Handguard and Gas Block Sight Base.

20" inch 1:8 Bead Blasted Stainless Steel Bull Barrel A4 Varmint Upper Half, .223 Wylde Chamber for 5.56mm & .223 Cal., complete with bolt, charging handle, RRA Aluminum Free Float Handguard and Gas Block Sight Base...

20" inch 1:8 Heavy Match Stainless Steel Air Gauged Barrel, A4 Upper Half, .223 Wylde Chamber for 5.56mm & .223 Cal., complete with bolt, charging handle, RRA Aluminum Free Float Handguard and Light Varmint Gas Block with...

16" inch 1:8 Heavy Match Stainless Steel Air Gauged Barrel, A4 Upper Half, .223 Wylde Chamber for 5.56mm & .223 Cal., complete with Chromed Bolt Carrier group, charging handle, RRA Aluminum Free Float Handguard and Light...

MODEL AR0590 CALIBER 223 Wylde Chamber for 5.56mm & .223 Cal. UPPER RECEIVER Forged A4 BOLT CARRIER GROUP Chromed Bolt Carrier Group CHARGING HANDLE Standard Charging Handle HANDGUARD Hogue Overmold Free Float...

AR0840x Rock River Arms 16 inch A4 Entry Tactical Upper Half 5.56/.223, Dominator 2 rear sight, A2 front sight, bolt carrier group, charging handle, Chrome lined 16" Barrel.