Fmtreading Posted October 5, 2020 Author Report Posted October 5, 2020 So I did read that post again there is no information relevant to front take down pins.As I stated thats where issue is gonna be no need to be disrespectful im not wasting your time as you choose with your own free will to answer.All parts are stock from dpms factory buffer assembly has never been moved or changed i have given much details and ill add more to waste time sure here's the information you requested.you already have the measurements for bcg also stock as the whole rifle is stock.
blue109 Posted October 5, 2020 Report Posted October 5, 2020 (edited) Can you measure the inside of the buffer tube? It looks too long for your DPMS buffer. The inside is the important measurement. Edited October 5, 2020 by blue109
Fmtreading Posted October 5, 2020 Author Report Posted October 5, 2020 It must of not went threw i thought I sent it.
blue109 Posted October 5, 2020 Report Posted October 5, 2020 (edited) How does the alignment pin look on the barrel? How does the slot look on the upper that the pin slides into? If either one of those are messed up I can allow the barrel to twist and the bolt lugs might hang up. Edit after looking at pics on first page again...upper notch and bolt lugs look pretty good from what I can see. Edited October 5, 2020 by blue109
Albroswift Posted October 5, 2020 Report Posted October 5, 2020 (edited) @Fmtreading To eliminate the lower, Clean the chamber and extension really good and try charging the upper without the lower attached. Round will probably be sticky, probably need to mortar it out but shouldn't be too hard. (Mortar it onto something softer then concrete floor. Or use a rubber mallet on the charging handle, that works for me) f you had a go gauge that would be even better then a live round. We are trying here to determine how difficult it is for the bolt to rotate into and out of battery. New 308 chambers can be tight. Different ammo can make a big difference. A lot of rounds that are difficult to extract manually fire and eject just fine, especially in a new chamber. Hopefully you didn't damage the barrel extension with the reaction rod and all that torque. The scratches look like drag marks from the lugs on the barrel extension, wouldn't worry about them. Probably take some time, be safe and keep after it. PS after converting g to oz I think you are going to find out that buffer is way too light. need 5.4 oz 153 g Edited October 5, 2020 by Albroswift
blue109 Posted October 5, 2020 Report Posted October 5, 2020 He said the gun ran fine before he beat on it, so im tentatively eliminating the usual "308 tight chamber" as the problem. The mystery here to me is that it hand-cycles fine with an empty chamber, and hand-cycles on the first chambered round but locks up tight on subsequent rounds. Was this repeatable? Did you do this a bunch of times to verify? It just doesnt really make mechanical sense. if its going to hang up with a round chambered, it should do it on every round.
Fmtreading Posted October 5, 2020 Author Report Posted October 5, 2020 Its 3.9 oz after converting from grams i was tired didn't even realize it wasn't on oz.@blue109 I've done this test approximately 6 times and everytime same thing happens.I've never seen anything like this and I can't find it online anywhere so I came here.im gonna try without the lower but that will be a single round at a time it always works fine on first but locks forward on 2nd round.
Fmtreading Posted October 5, 2020 Author Report Posted October 5, 2020 And I've ran test 4 times with a pmag and twice with a stock metal mag.
Fmtreading Posted October 5, 2020 Author Report Posted October 5, 2020 @Albroswift Is this what you had in mind. https://www.wingtactical.com/firearm-parts/ar-10-lr-308/ar-10-lr-308-buffer-buffer-tubes/kaw-valley-precision-ar10-ss-tungsten-carbine-buffer/
Fmtreading Posted October 5, 2020 Author Report Posted October 5, 2020 Ok im just throwing a guess out there is this normal in order for it to line up it needs to be slightly off barrel and gas tube.
Fmtreading Posted October 5, 2020 Author Report Posted October 5, 2020 New problem now buffer tube comes off everytime i try and pull charging handle the spring come off.
Fmtreading Posted October 5, 2020 Author Report Posted October 5, 2020 Does it seat with pin touching the buffer or not and is flat end down or round?
Fmtreading Posted October 5, 2020 Author Report Posted October 5, 2020 I figured out the buffer tube situation spring needed to be seated first i was doing it after I tighten it down.
Albroswift Posted October 5, 2020 Report Posted October 5, 2020 2 hours ago, Fmtreading said: @Albroswift Is this what you had in mind. https://www.wingtactical.com/firearm-parts/ar-10-lr-308/ar-10-lr-308-buffer-buffer-tubes/kaw-valley-precision-ar10-ss-tungsten-carbine-buffer/ Yes, exactly what I'm running in my 12.5 in ar308. Better yet replace the entire tube, buffer, and spring with the Armalite 7-3/4" setup when back in stock.
Albroswift Posted October 5, 2020 Report Posted October 5, 2020 alignment: gas key should line up with alignment pin in barrel extension. With the bolt all the way seated will the key line up?
COBrien Posted October 5, 2020 Report Posted October 5, 2020 2 hours ago, Fmtreading said: I figured out the buffer tube situation spring needed to be seated first i was doing it after I tighten it down. If the buffer tube is installed correctly, there should be no way for your buffer retainer and spring to come out. The buffer tube should cover/catch the edge of the retainer and keep it in place. How were you installing the retainer after installing the buffer tube?
Fmtreading Posted October 5, 2020 Author Report Posted October 5, 2020 I figured the buffer situation out.I put the spring in first then tighten down until it sat over piece so pin is whats stopping it i know can charge freely back and fourth no issue besides charging handle locking on 2nd round.
Fmtreading Posted October 5, 2020 Author Report Posted October 5, 2020 It no longer moves its installed correctly now.
Fmtreading Posted October 5, 2020 Author Report Posted October 5, 2020 @Albroswift first pic is what im assuming you mean by seated like this it wont line up.
Fmtreading Posted October 5, 2020 Author Report Posted October 5, 2020 @Albroswift like this it lines up perfectly.
blue109 Posted October 5, 2020 Report Posted October 5, 2020 Thats the cam pin. Hes saying that little pin on the barrel should be lined up with the gas key on the carrier. The chamber section at the rear of the barrel is threaded on and "glued". Its always possible you twisted it a little, but id think the slot in the upper would look ragged if that were the case, and it doesnt explain why the first round unlocks fine. I was also thinking maybe you crushed the front of the upper a tiny bit allowing the barrel to seat deeper into it shrinking the headspace enough to lock it up with a round chambered. No fix if thats the case. Its hard to troubleshoot this one over a computer.
blue109 Posted October 5, 2020 Report Posted October 5, 2020 (edited) When you incredible hulked it the first time....was the BCG in the gun? If so...pull that cam pin out. Does it look dinged up or heavily worn anywhere on the shaft? How about the slot it rides in? Edited October 5, 2020 by blue109
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