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10/20/2017 1:01:18 AM
9/22/2017 12:11:25 AM
Posted: 9/13/2005 5:22:33 PM EDT
I never really fooled around with the carbine length barrels till now (have had and still do have a few 20" guns).

What's the feed channels I occassionally read about.? What differentiates an M4 barrel from the standard lenth (other than length and weight!)
Link Posted: 9/13/2005 5:31:19 PM EDT
feed ramp cuts in the reciever and extension allow for less chance of failure to feed, etc. The bbl has a step cut for mounting the M203 grenade launcher.
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