Originally Posted By: PowerfisherThanks again for the replies. I have two magpul magazines and the issue happens with both of them. I also tried a metal magazine that I borrowed from a friend and it did not solve the problem. I am going to spend the weekend crawling through it, looking for burs and any other thing that may cause the problem and am going to clean it again using a chamber brush. I used gun scrubber and I will do it again and I will use break clean as well.
that eliminates the magazine.
Quote:I did the one shot test and the bolt does stay open but when I push the bolt release lever, it doesn't close all the way and I have to use forward assist. If the bolt is closed and I pull it back to chamber the first round, it shoots fine, but the next round needs forward assist.
so the bolt wont even close all the way with no ammo being loaded?
have you taken the bolt carrier group apart and cleaned it super well? the chamber where the gas rings slide along tend to build up a lot of carbon, and will often need to be scraped out to remove it. solvents usually wont get it all, especailly if its heavily built up. this is why i mentioned using a ultrasonic cleaner if you have one. TBH i think my Ultrasonic tank is one of the best small gun parts cleaning tools i own.
field strip the bcg - take the bolt, cam pin, etc out - and really give it a once over. you might be surprised what comes out from inside of it.
Quote:I do know that the buffer weight is not adjustable and that's why I am going to buy an adjustable one as well as new gas rings. I will assemble it dry, dry, dry and cycle the bolt manually a couple hundred times. I will also get as much information as I can about the upper and will let you know what I have. Thanks again!
do you have an adjustable "carbine" stock? or a fixed a1/a2? that will help us determine the base weight. you can always take it out and pop it on a scale to find out what you have.
do note, that with the DMPS LR308 system, you CANNOT use a standard ar-15 buffer, the 308 carbine buffer is SHORTER than a standard AR-15 Carbine buffer due to the standard buffer tube length but longer BCG.
i would not waste your $ on an adjustable weight buffer system for it, if you're gonna upgrade at all, go straight for an XH from slash's - once you have your cycling issue sorted out anyway. the system isnt under gassed (trust me, its a dpms 308 ar... lol), and is likely over gassed unless the block isnt aligned properly.