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Posted: 2/2/2006 2:10:06 PM EDT
Will the M4 RAS fit a heavy profile barrel?

I'm thinking no, but I'm hoping yes.

Thanks.
Link Posted: 2/2/2006 2:11:00 PM EDT
I know for a fact it fits a Bushmaster HBAR profile 16" carbine barrel.....
Link Posted: 2/2/2006 2:43:59 PM EDT
i dont see why not?

the problem will be with bull bbls.
Link Posted: 2/2/2006 3:33:11 PM EDT
yes. works fine with my bushy 11.5" hbar.
Link Posted: 2/2/2006 4:55:11 PM EDT
Well, I read on Quarterbore's website that it will only work on barrles that are "0.835 inches - 0.855 inches diameter just after the front sight tower". I measured mine with my caliper and it read 0.8775 inches. It is an 11.5 inch 7.62x39 barrel. Maybe the 7.62 hbars are thicker than the 5.56 hbars? I've ordered the RAS so I guess I'll find out if it fits or not. I may swap the RAS for the Surefire M73 that I have on my 11.5 5.56. I think the ARMS 38-ex on the 7.62 may interfere with the RAS anyways. The M73 is shorter and may fit better with the 38-ex.

Thanks for the help.
Link Posted: 2/2/2006 5:49:42 PM EDT
Fits a Colt 6721 upper just fine.
Link Posted: 2/3/2006 12:43:22 AM EDT

Originally Posted By Harv24:

I know for a fact it fits a Bushmaster HBAR profile 16" carbine barrel.....




+1

Installed with no problem on my "M-4gery Carbine-type thingy"...
Link Posted: 2/3/2006 2:06:19 AM EDT
[Last Edit: 2/3/2006 2:07:46 AM EDT by M4A2_L073754]
.
Link Posted: 2/7/2006 3:22:59 PM EDT
is this it?
Link Posted: 2/7/2006 3:33:04 PM EDT

Originally Posted By fq1234:
Well, I read on Quarterbore's website that it will only work on barrles that are "0.835 inches - 0.855 inches diameter just after the front sight tower". I measured mine with my caliper and it read 0.8775 inches. It is an 11.5 inch 7.62x39 barrel. Maybe the 7.62 hbars are thicker than the 5.56 hbars? I've ordered the RAS so I guess I'll find out if it fits or not. I may swap the RAS for the Surefire M73 that I have on my 11.5 5.56. I think the ARMS 38-ex on the 7.62 may interfere with the RAS anyways. The M73 is shorter and may fit better with the 38-ex.

Thanks for the help.



Hey, how did that work out?
Link Posted: 2/7/2006 7:02:51 PM EDT

Originally Posted By Hellhound:

Originally Posted By fq1234:
Well, I read on Quarterbore's website that it will only work on barrles that are "0.835 inches - 0.855 inches diameter just after the front sight tower". I measured mine with my caliper and it read 0.8775 inches. It is an 11.5 inch 7.62x39 barrel. Maybe the 7.62 hbars are thicker than the 5.56 hbars? I've ordered the RAS so I guess I'll find out if it fits or not. I may swap the RAS for the Surefire M73 that I have on my 11.5 5.56. I think the ARMS 38-ex on the 7.62 may interfere with the RAS anyways. The M73 is shorter and may fit better with the 38-ex.

Thanks for the help.



Hey, how did that work out?



The 7.62 x 39 HB definately seems to be thicker than the 5.56 HB (although I didn't measure it). I moved the Surefire over and am going to put the RAS on the 5.56. It should arrive Friday (I believe). I'll try and remember to post the results.
Link Posted: 2/9/2006 7:38:51 PM EDT
Got the RAS today.

Someone had IMed me and gave me a hint on how to get this to work.

The RAS wouldn't quite fit the HB as it came. There is a hooklike part that fits into the barrel nut and is tightened down by a screw. The RAS fit when I removed this part. It still feels rock solid, but I probably won't mount any optics on it since there isn't anything keeping it from spinning if enough pressure was applied.
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