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1/25/2018 7:38:29 AM
Posted: 1/4/2006 6:48:09 PM EST
I would to know if the R0977 upper is the same as the LE6921upper?
Link Posted: 1/4/2006 7:17:01 PM EST
[Last Edit: 1/4/2006 7:19:42 PM EST by theshootersden]
By no means am I a COLT expert but do know that both are the same...

Flat top with 14.5" chrome lined 1/7 twist barrel...
Link Posted: 1/5/2006 2:49:08 AM EST

Originally Posted By theshootersden:
By no means am I a COLT expert but do know that both are the same...

Flat top with 14.5" chrome lined 1/7 twist barrel...



I agree with shootersden, and would add that the only difference may be the bolt carrier and I emphasize may.

But the bolt and carrier are not necessarily parts considered when referencing complete upper recievers.

One other thought.

The RO977 may have a heavier barrel under the handguards. LE/.mil types may offer insight here.

Paging: Ekie, Tweak, Mr Ryan........................
Link Posted: 1/5/2006 4:16:02 AM EST
[Last Edit: 1/5/2006 7:41:59 AM EST by theshootersden]

Originally Posted By redfisher:
The RO977 may have a heavier barrel under the handguards. LE/.mil types may offer insight here.

Paging: Ekie, Tweak, Mr Ryan........................



Your right come to think about it... I do believe the R0977 has the SOCOM type medium weight barrel... The LE6921 has the government profile, lighter under the hand guard barrel...
Link Posted: 1/5/2006 8:05:29 AM EST
[Last Edit: 1/5/2006 8:05:58 AM EST by scottryan]
It depends

The LE6921, RO920, RO921, RO979, and RO977 will have the same upper.

The safe-semi-full variants of the above could have the midweight barrel after 2001 while the others have the regular M4 barrel.
Link Posted: 1/5/2006 5:25:21 PM EST
I have a dumb question . How does the medium barrel help the M4A1 , M4 R0977 ? Wouldn't it hold in more heat?
Link Posted: 1/5/2006 7:34:05 PM EST

Originally Posted By WILDBILL756:
I have a dumb question . How does the medium barrel help the M4A1 , M4 R0977 ? Wouldn't it hold in more heat?



Beefier barrel for sustained full auto use.
Link Posted: 1/31/2006 8:07:56 PM EST
Any new information?
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