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Old 07-20-2012, 21:50   #16
Iraqgunz
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Join Date: May 2010
Location: Wisconsin BCM territory
Posts: 152
A gentleman by the name of Ned Christiansen makes a 5.56 chamber gage. If you insert the gage into a chamber (must be clean) and it falls free, then it is a 5.56. If it sticks or otherwise doesn't fall free then it is a .223 and needs to be reamed. He makes a true 5.56 reamer that does this.

Bushmaster, DPMS, Stag Arms, CMMG and a host of others are well known for having chambers that were too tight.

Every one of the 500 Bushmaster carbines we had in Iraq exhibited issues with the chambers and I had to hand ream each one with the reamer. Then I added the extractor upgrade and the malfunctions dropped to almost nil.

I even did side by side comparisons with a Colt 14.5" upper and an LMT 10.5" upper that I had in the armory. When I ran them side by side with the Bushies using the same ammo (M855, Prvi Partizan SS109 and Bulgarian SS109) they all functioned as they were supposed to. The non-reamed Bushies exhibited about a 40% failure rate (either a failure to extract or primers blowing out).

Currently in the U.S market there are only a few companies that make barrels (chrome lined) that are even close to being reliable. FN, Daniel Defense, Colt and Noveske round that list off.

Quote:
Originally Posted by Gene Econ View Post
OK -- now I am curious.

What process did you use to inspect the chambers and how are you sure the chamber was the problem and not the gas system / timing?
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Old 08-02-2012, 12:02   #17
gus7
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very true!

Quote:
Originally Posted by The Reaper View Post
Loose primers are generally a pressure or overworked brass indicator.

The chamber issue can cause it as well, via pressure spikes.

Do not shoot 5.56x45 in .223 chambers.

TR
above quoted is part of it now the rest is a scandal in the making ... Badly made ammo ,one of the leading causes of this one ,yes BADLY MADE AMMO like the early days of the m-16 in 'nam ...we playing the blame game again ...but both causes go to the manufacturers of the ammo and weapons equally .......you don't cut corners ever !Q/C please!!!
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