eightmd Posted September 5, 2013 Report Share Posted September 5, 2013 Well I'm putting together my DPMS LR 308 style rifle, and I'm trying to fit my gas tube to my bolt. I mean it fits in there but the last 1/3 or 1/2 of an inch it takes a little push. Is that normal? I have been bending the tube a little to get it going in as easy as I can but it doesn't just fall in. Of cource when it is put together and the bolt slams with the force of the buffer spring it closes and is not a problem. Is this ok or should the bolt just drop completely into the gas tube? Also is it just the force of the bolt slaming home that rotates the bold into the barrel? And how can I make sure that my bolt is rotating all the way and completely in battery? Thanks for any help, this is my first AR style weapon. Quote Link to comment Share on other sites More sharing options...
survivalshop Posted September 6, 2013 Report Share Posted September 6, 2013 Not sure what you mean by gas tube fit ? Are you talking about the bolt fitment into the barrel extension ? Because the bolt carrier group , will need a slight amount of pressure to seat the bolt into the barrel extension when the bolt lugs cam into the barrel extensions locking lugs. Quote Link to comment Share on other sites More sharing options...
edgecrusher Posted September 6, 2013 Report Share Posted September 6, 2013 Please don't bend your gas tube, that will only give you problems in the future. I too am not quite sure if that's what you really mean. If you mean the lugs of the bolt going into battery (the barrel extension), then yes, like Survivalshop said, there should be some tension and resistance. Quote Link to comment Share on other sites More sharing options...
eightmd Posted September 6, 2013 Author Report Share Posted September 6, 2013 I'm talking about two different things. First is the gas tube fits into a cylindrical hole in the bolt carrier assembly. Is that suppose to go in effortlessly? I'm wondering is mine is lining up well enough. The second is the bolt rotating into battery. There doesn't seem to be anything that actually rotates the bolt. Is it just the force of the bolt going forward that causes the bolt to rotate into battery? Quote Link to comment Share on other sites More sharing options...
shibiwan Posted September 6, 2013 Report Share Posted September 6, 2013 (edited) I'm talking about two different things. First is the gas tube fits into a cylindrical hole in the bolt carrier assembly. Is that suppose to go in effortlessly? I'm wondering is mine is lining up well enough. The second is the bolt rotating into battery. There doesn't seem to be anything that actually rotates the bolt. Is it just the force of the bolt going forward that causes the bolt to rotate into battery? The bolt gas key should fit in the gas tube with minimal resistance. There's a possibility that your gas tube is bent. Yes, as the bolt carrier moves forward, the bolt rotates as the bolt cam pin rides in the angled slot in the bolt carrier (under the gas key). There should be a little extra "resistance" as the bolt carrier group moves in the final 1/2" or so. Try this -- remove the entire BCG, then pull the bolt out. Next push the bolt into the bolt carrier and you'll see it rotate as it gets pushed in. Pull it out and it rotates the opposite direction. -S Edited September 6, 2013 by shibiwan Quote Link to comment Share on other sites More sharing options...
98Z5V Posted September 6, 2013 Report Share Posted September 6, 2013 ^^^ With that, go one more step. Remove the bolt from the bolt carrier, and slide the carrier into the upper receiver. If it doesn't go all the way forward, it's binding on the gas tube, for whatever reason. Quote Link to comment Share on other sites More sharing options...
eightmd Posted September 6, 2013 Author Report Share Posted September 6, 2013 OK thanks guys. I had not disassembled the bolt carrier group. I'll do that and check it. It sounds like it is working correctly, I just want to make sure. I'm also new to the ARs so I'm figuring out how it works at the same time. Quote Link to comment Share on other sites More sharing options...
survivalshop Posted September 6, 2013 Report Share Posted September 6, 2013 Sounds like you have it & we were all new at this at one point or another . Wish I had the internet thirty years ago, or more , for that matter. Quote Link to comment Share on other sites More sharing options...
shibiwan Posted September 6, 2013 Report Share Posted September 6, 2013 We're all "new" at some point or other when picking up something we've never done before, but a wise person will learn from the mistakes and advice of others. :) BTW, Remember to oil the entire bolt carrier group well (WET!). It really helps with a new AR-style gun as the parts aren't broken in yet. -S Quote Link to comment Share on other sites More sharing options...
survivalshop Posted September 6, 2013 Report Share Posted September 6, 2013 Also check the gas block alignment , if not a tapered pin attachment . Of course its possible, that, that alignment could be off , but unlikely . You can look down at the inside of the stripped upper assembly( no charging handle or BCG ). Use something to gage the gap between the gas tube & the carrier keyway in the upper at the end or tip of the gas tube where it protrudes inside the upper receiver. Normally I can just look down at it & tell its off or not. Quote Link to comment Share on other sites More sharing options...
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