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Funny. I thought the definition of a dissipator was a barrel as short as would run reliably with a rifle-length gas system, so that much of the recoil was "dissipated".
Well, it seems to run fine with LC M193 ammo. I would prefer it works with .223 ammo as well given that LC M193 does not grow on trees anymore. Would opening the gas port up help any? Or should I just leave well enough alone?
I'd get it checked out. It should easily run .223 ammo. I wouldn't just open the port without determining for sure that it was needed.
Here is an update on the rifle:
I was unable to get any response from CMMG customer service by e-mail or phone. I decided to remove the FSB to see if there was any visible problem. While trying to drive our the taper pins I learned that CMMG does not use hardened steel pins. The pins were like butter and despite my best efforts and care they just became more and more deformed. I finally took a 1/16" drill bit and bored a hole half way through the pins. It was like drilling through aluminum. I then used the same drill bit as a punch. This put the driving force of my hits lower on the pins and they finally came out.
I could see where gas was leaking from the port under the FSB and toward the handguards. I surmised that because the CMMG pins were so soft, they were unable to make a tight seal between the barrel and FSB. The pins essentially push down on the FSB and up on the barrel creating a tight seal. The CMMG pins were doing nothing more than holding the FSB on. I re-attached the FSB using Colt pins I ordered from Brownell's. The pins were noticeably better in quality and while being driven in did not squish in place like the CMMG pins. Back to the range - cycled the .223 ammo without a problem.
While I will never buy another CMMG product again because of their customer service, I do feel that the barrel is decent - I get good groups with it, and it is made from CV steel. The FSB is F marked - looks to be a standard mil-spec part. The permanently attached FH was done properly and is properly timed. Headspacing is right on. I am a bit confused as to why CMMG would use something other than a mil-spec taper pin given that it is such an inexpensive part.
If I could have found another company that makes a lightweight 14.5" midlength barrel I would have considered them. The closest I could find was Noveske, but I wanted a lightweight profile. Live and learn.
Last edited by 1811guy; 07-02-09 at 09:51.
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