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This Bushmaster upper receiver is made of carbon steel with carbine length hand guards. Its barrel i..
This popular complete upper features a light weight, chrome lined 16" barrel in a M4 "cutout" profil..
This Bushmaster upper receiver has a chrome-lined barrel made of 4150 chrome-moly-vanadium steel fin..
The Optics Ready Carbine upper has a 16" 4150 chrome-moly-vanadium barrel with an M4 profile and har..
Adapted from the very accurate and successful 24" Varminter, the Predator Complete Upper Receiver/Ba..
This complete upper assembly features a 24" Fluted Extra Heavy Barrel in 5.56mm/.223 Rem. caliber wi..
This Bushmaster 300 Blackout upper receiver is made of carbon steel and finished in black teflon. It..
This is a comlete upper in .450 Bushmaster Caliber with 20" barrel and Izzy Suppressor. Includes 4 R..
The Gen-II Pro Series carbine upper is an evolution of the M4 model, adding a 7.8" free float alumin..
The Gen-II Pro Series Rifle upper is an evolution of the M4 model, adding an 11.8" free float alumin..
CMMG Upper Complete that is built off of the standard forged A3 receiver with M4 feed ramps. The bar..
9mm M4 CMMG Complete Upper. Featuring Mil-Spec A3 Receiver, 4140 WASP Barrel with 1:10 twist. The 9m..
This is a complete upper 300 AAC Blackout. Featuring a carbine length handguard, "F" marked front si..
CMMG basic upper, the Mk4 LE features a nitrided 16.1" 4140 CrMo steel barrel in a M4 profile. The s..
When modularity, affordability, and quality are all important the Mk4 T is the upper of choice. The ..