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9/22/2017 12:11:25 AM
Posted: 8/31/2005 7:07:30 AM EDT
[Last Edit: 8/31/2005 7:08:00 AM EDT by ar556223]
Will someone please tell me if this is correcthandguards6721: Larger diameter than 6920, uniform diameter for the entire length
6520: Narrower than the 6920, uniform diameter entire length

Thanks
Link Posted: 8/31/2005 9:08:32 AM EDT
Model 6920: M4 government profile, 0.640 under handguards, 0.750 under FSB, 0.610 M203 notch and 0.710 to 0.750 front of FSB.

Model 6721: IIRC it's a HBAR heavy barrel profile, approx. ~0.8 to 0.9 under the handguards, 0.750 under FSB and forward.

Model 6520: LW barrel profile, 0.625 uniform dia. entire length.
Link Posted: 8/31/2005 9:50:14 AM EDT
Thanks,
Alpha-Romeo3!! hug.gif
Link Posted: 8/31/2005 10:22:57 PM EDT
how about the colt 20" USGI profile ?
0.750" at the FSB and 0.740" before ?
Link Posted: 8/31/2005 10:40:58 PM EDT

Originally Posted By exocet:
how about the colt 20" USGI profile ?
0.750" at the FSB and 0.740" before ?


How about my Colt M16A2 20" barrel, should be exactly USGI.

There's a slight taper under the handguards, 0.675 near the chamber down to 0.600" dia. behind the FSB.

At the FSB it's 0.750". Forward of the FSB it's 0.720" and right next to the FS it's 0.700".
Link Posted: 9/1/2005 7:46:05 AM EDT
thank you.
Link Posted: 9/1/2005 7:52:23 AM EDT
20" gov't profile barrels have a slight taper under the handguards.

If I remember, I can measure an M4 gov't profile barrel for taper later today.
Link Posted: 9/1/2005 8:36:00 AM EDT
[Last Edit: 9/6/2005 2:59:40 PM EDT by Alpha-Romeo3]

Originally Posted By mongo001:
20" gov't profile barrels have a slight taper under the handguards.

If I remember, I can measure an M4 gov't profile barrel for taper later today.





I got my M4 barrel dims from this drawing rather than actually measuring it.

On the 20" govt profile I actually measured my Colt M16A2 barrel.


ETA: Tried to enlarge the photo but my photo hosting won't allow it.
Link Posted: 9/1/2005 10:08:11 AM EDT

Originally Posted By Alpha-Romeo3:

Originally Posted By mongo001:
20" gov't profile barrels have a slight taper under the handguards.

If I remember, I can measure an M4 gov't profile barrel for taper later today.


i6.photobucket.com/albums/y232/Alpha-Romeo3/Hunting/M4riflebarreldwgMedium.jpg


I got my M4 barrel dims from this drawing rather than actually measuring it.

On the 20" govt profile I actually measured my Colt M16A2 barrel.


ETA: Tried to enlarge the photo but my photo hosting won't allow it.



OK. I'll measure my Colt barrels when I get home. I have a 14.5" and a 16" (6920????). I measured two different gov't profile 20" barrels (a Colt and an EMCO) and both have a slight taper.
Link Posted: 9/3/2005 1:56:57 PM EDT
I have a 20" colt and can measure it for u if you call 480-367-9540
Link Posted: 9/3/2005 5:20:09 PM EDT

Originally Posted By JPSBARRELS:
I have a 20" colt and can measure it for u if you call 480-367-9540



that would be great if you can post your results here so people can have access to it as well. Thanks !!!
Link Posted: 9/3/2005 7:36:20 PM EDT
[Last Edit: 9/3/2005 7:39:18 PM EDT by theshootersden]

Originally Posted By exocet:

Originally Posted By JPSBARRELS:
I have a 20" colt and can measure it for u if you call 480-367-9540



that would be great if you can post your results here so people can have access to it as well. Thanks !!!



Yeah, whats up with that? Ive been seeing that number posted a lot around here lately... He's probably just doing it for barrel sales... 'FREE' advertisement maybe?

It would be nice though if he posts it for others to see also...
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