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Posted: 5/10/2003 7:33:03 AM EDT
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Just got this e-mail. Any body know or can help with this question? Hi, I have a legally-owned and registered Frankford Arsenal XM-177 (M-16 shorty w/ 12" bull-barrel) that I am having ejection problems with. The cases are not being thrown from the breech, and it jams the action. The weapon has less than 1000 rounds through it - I don't shoot it very often. I tried cleaning out the chamber with a military-style chamber brush, but it did no good. I'm thinking if I polish the chamber, it MIGHT solve the problem. Who in the Houston-area of Texas will work on catagory II firearms? I could remove the upper receiver and the bolt and send it to someone (or leave it with someone in my area), as the lower receiver is actually the firearm. Any help would be appreciated. Thanks, Ralph =================== Ken Roberts RSA |
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...sounds to me like it is a gas tube problem. There are a couple different solutions. 1. The Pigtail tube (winds around the barrel) 2. MSTN on this board has a new type of tube that feeds more gas thru it. This is a common problem with short barreled ARs. Also advise him to dump it and get a Krink!  <----Krink wink...
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Don't do anything rash until he puts a M-4 extractor spring and insert in it. Sounds like the extractor is letting go before the ejector can punch it out. Failing that I would try a new ejector spring. www.sawlesales.com
Get one of these while you are at it as they are cheap. May not need it but it is cheap.
I would advise him to dump the 10 1/2 inch upper and get an M-4 upper. Thats how I fixed a pre-ban with I bought(Actually, it was a 16 inch pencil barrel and not a true M-4 cut barrel.). Try the stronger extractor, it is the cheapest fix and if as described is his only problem, it will proabally work fine. |
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yup. heavy knows. replace the extractor spring and insert...possibly the extractor claw, also...if the gun has hammered a lot of rounds thru it. those springs heat-soak and lose the strength required to grip the rim during the fast cycling action of the xm's short bbl.. if the gun were mine (weird, but i just was looking at an xm clone this morning!), i would weight up the buffer a tad just to slow it down a bit. if the extractor swapout fails to cure it, install either the adjustable gas tube or choke the gas by altering the fsb. i'll bet you a beer that the extractor spring and insert doctor it back to health. |
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...here i sthe part I was thinking about... www.ar15.com/forums/topic.html?b=7&f=22&t=162961&w=searchPop 
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