AR Sponsor
Posted: 12/2/2007 5:03:05 PM EDT
|
Everything went together great, but I did use a slightly used Colt 20in barrel I had. All the rest of the gun is RRA. The problem I have is with the chamber, it will close over the "go gauge" but it is extremely tight, so much in fact that when you let it slam home, the charging handle can't be pulled back to "extract" the go gauge and the bolt actually has to be "smacked open" with a bras punch and hammer ? The same set of events on my Colt 6920, yields a different result. The Colt chambers, closes and extracts the "go gauge" without a single problem(it to, is Un-fired). Now, when I chamber a dummy round(a complete round w/no powder and no primer) it chambers, closes, and extracts from the magazine until there are no more "dummy" rounds ? I have checked all tolerances and specs on the used Colt barrel and they are exact to Colts "factory new" barrel specs. I even took the upper all apart and checked all tolerances for every part and re-assembled making sure everything lined up correctly and got the same result. Also, checked for debris and carbon build up, hell, I even cleaned it 6 times to make sure there was no issues with the lugs locking. So, I'm just guessing that its just tight tolerances ? Since it will chamber and extract the rounds, but doesn't on the gauge ? Just wanting an opinion before I shoot it. Any answers and help would be great ! |
| I miss worded that, I meant pushed shut and locks, but then won't unlock and extract. I half to force with a brass punch. But it will with the round ? The bolt is brand new ? So, you think its the bolt ? I took a look again today and if you go real slow and let it lock up slowly. it will lock half way into battery and stick, having to be popped back with the brass punch ? It will actually close and lock and extract with the "dummy" round with out a problem ? Measuring the gauge with a caliper it seems top be a hundredth of a thousandth bigger than five of the rounds I measured ? Could this be why the gauge hangs the bolt up after locking ? When the gun smith "fixes" the camber, doesn't he lengthen the chamber bore ? This would have little affect on the issue because just simply dropping the gauge in there, it seats fully in the chamber neck ? Also, I have been trying the gauges with all the extractor parts in it, coulkd that be my problem ? |
|
Definately remove extractor and ejector from bolt. Remove upper from lower and hand close the bolt on the go-gauge. It may have been the ejector pushing the gauge too tightly into the bore. Be gentle with it. There are threads about checking headspace here and there is info on two types of gauges 5.56 (commercial and mil) spec and .223 spec and wylde spec i believe. I believe that there slight differences with these and somewhere in DIYS there is some more info. Firmly closing/forcing the bolt closed on the gauge can scratch the chamber or damage the gauge (if it is a softer metal) |
Thanks for all the info guy's ! I went to my favorite AR dealer and he told me that the gauge I had wasn't right for the H-Bar barrel from Colt I was using it in because it was a "civilian" gauge and I needed a "military" gauge for it. So, he took it and checked it in front of me and to both our surprise, even the "military" gauges were tight ? He re-examined the barrel and told me I got a hell of a deal because the barrel had most likely only had 1 or 2 mags worth of ammo through it and the so called "issues" I was having, was simply do to an "almost new" barrel and lugs. So, we shot it at the range, and it functioned flawlessly dor all 200 rounds I put down range. Problem solved ! Thanks again for all the advice gentlemen, it was very helpful ! 
|
AR Sponsor
Win a FREE Membership!
Sign up for the ARFCOM weekly newsletter and be entered to win a free ARFCOM membership. One new winner* is announced every week!
You will receive an email every Friday morning featuring the latest chatter from the hottest topics, breaking news surrounding legislation, as well as exclusive deals only available to ARFCOM email subscribers.