This is the complete M4 Barreled upper assembly from Windham Weaponry's unique "SRC" rifle. Its tack-driving 16" M4 profile barrel is chrome lined and machined from 4150 chrome moly vanadium steel - rifled 1 x 9" right hand twist includes an A2 flash suppressor. A picatinny rail gas block with sling swivel and bayonet lug allows the attachment of a variety of front sights. M4 dual heat shield handguards complete the barrel.
The machined aluminum flat top upper receiver is complete with: