[ARCHIVED THREAD] - Yet another M4 question...

Posted: 11/21/2001 1:04:44 PM EDT

Hi:

Does anyone out there care to enlighten an M4-newbie? I'm seeing reference to the "M4 feedramp cutout" in some old topics.

What does that mean?

Thanks,
SAB

Posted: 11/21/2001 1:13:08 PM EDT

[#1]

The upper reciever has 2 slight cuts inline with the feed ramps, supposedly helps the bullet feed and reduces jams.

Posted: 11/21/2001 1:19:21 PM EDT

[#2]

Thanks, JoshD!

Follow-up Questions:
Does the chamber end of the barrel also have a cut-out?

If so, do the barrel and receiver have to either both have the cut-out or neither have the cut-out in order to be compatible?

Thanks,
SAB

Posted: 11/21/2001 5:09:05 PM EDT

[#3]

Closeup of Colt extended feed ramps, which they have added to ALL their carbines, including the M4 series. The feed ramps are extended from the barrel extension onto the upper receiver. "Standard" feed ramps end at the edge of the barrel extension.

The rifle on the left has the extended ramps on both the barrel extension and upper receiver, as intended. The rifle on the right has the extended ramps on the barrel extension (i.e., cut at a shallower angle and designed to match up with a 'cut' upper receiver), but a standard upper receiver with no feed ramp extensions.

-Troy

Posted: 11/21/2001 5:15:20 PM EDT

[#4]

Troy:

Thanks for the excellent explanation (with visual aids, even). Above and beyond the call of duty, for sure!

SAB

[ARCHIVED THREAD] - Yet another M4 question...

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[ARCHIVED THREAD] - Yet another M4 question...

[ARCHIVED THREAD] - Yet another M4 question...