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Operation Dumbo Drop.
The very earliest M4s delivered to the US Army in had fixed carry handles and were known in Colt's catalog as the Model
Rage and Honor II.
This is a very attractive feature for enthusiasts, who often purchase a number of upper receivers often in different calibers and interchange them with the same lower receiver.
With and without M grenade launcher.
An even shorter-barreled M4A1 Carbine, it has a
Modeled with reassembles to the Canadian C7 rifle, noticing by the handguard and the small rails attached beside the front iron sight.