Dr1620 Posted September 29, 2018 Report Share Posted September 29, 2018 Hi guys my name is David and I'm just checking out there to see if any of you guys can help me. I bought a new 308 Upper from Aero precision and I built a lower also Aero precision and have a bolt carrier group and charging handle Aero precision. My issue is I bought 147 grain PMC and every single case I put through it gets jammed either from the tail or straight up on the neck. I read someone else's issues with the 308 also doing the same thing and they said 168 grain fix their problem, so I went and bought 168 grain to see how it work. The first two rounds ejected perfectly but then I start again the same jams again. I ended up getting five clean injections out of the 20 rounds I purchased of the 168. I'm curious if I'm either under gas or over gas which I wouldn't really think so seeing how it's brand new upper built by Aero precision. Maybe it's the buffer and spring maybe it needs to be heavier or lighter if anyone can help me with that and maybe they have some information I know how to fix this problem before I go spending a bunch of money on other parts that I probably don't need. Thank you for your help in advance David Quote Link to comment Share on other sites More sharing options...
sketch Posted September 29, 2018 Report Share Posted September 29, 2018 clean new parts and lube them. dont rush in to a contest format, take your break in as a get to know your rifle period and keep us up to date in the intro section.. David Quote Link to comment Share on other sites More sharing options...
edgecrusher Posted September 29, 2018 Report Share Posted September 29, 2018 4 hours ago, sketch said: clean new parts and lube them. dont rush in to a contest format, take your break in as a get to know your rifle period and keep us up to date in the intro section.. David The forum is doing that, something is up there. We need more info. Buffer, spring and receiver extension measurements. Length, coil count, internal depth. Also barrel details too. How much lube? These large frames tend to like lots during break in. Welcome to the forum and feel free to do an intro Quote Link to comment Share on other sites More sharing options...
shepp Posted September 29, 2018 Report Share Posted September 29, 2018 13 hours ago, Dr1620 said: Hi guys my name is David and I'm just checking out there to see if any of you guys can help me. I bought a new 308 Upper from Aero precision and I built a lower also Aero precision and have a bolt carrier group and charging handle Aero precision. My issue is I bought 147 grain PMC and every single case I put through it gets jammed either from the tail or straight up on the neck. I read someone else's issues with the 308 also doing the same thing and they said 168 grain fix their problem, so I went and bought 168 grain to see how it work. The first two rounds ejected perfectly but then I start again the same jams again. I ended up getting five clean injections out of the 20 rounds I purchased of the 168. I'm curious if I'm either under gas or over gas which I wouldn't really think so seeing how it's brand new upper built by Aero precision. Maybe it's the buffer and spring maybe it needs to be heavier or lighter if anyone can help me with that and maybe they have some information I know how to fix this problem before I go spending a bunch of money on other parts that I probably don't need. Thank you for your help in advance David Welcome David, feel free to tell us about yourself in the intro section Quote Link to comment Share on other sites More sharing options...
survivalshop Posted September 30, 2018 Report Share Posted September 30, 2018 Photo of the rifle ? What stock system ? & as Edgecrusher posted , we need Buffer Spring total length , coil count , & was it designated as a 308 Buffer & Spring , also Buffer length & weight ? We see a lot of miss matched Buffer components that cause issues & its not always the Builders fault . Quote Link to comment Share on other sites More sharing options...
Dr1620 Posted October 2, 2018 Author Report Share Posted October 2, 2018 Thanks guys. I've been in bed with back pain but will get up tomarrow with the information you guys are requesting. Thanks for the help. David Quote Link to comment Share on other sites More sharing options...
Dr1620 Posted October 2, 2018 Author Report Share Posted October 2, 2018 Okay guys here's what I have my buffer is 3.8 Oz and 2 and 1/2 inch the spring is 11 inch with 26 coils. Yes it was designated as 308 spring buffer tube and buffer. The buffer tube itself is 7 inch. Hopefully this will help you guys help me please respond as soon as you get a chance appreciate all the help I can get thank you. David Quote Link to comment Share on other sites More sharing options...
survivalshop Posted October 3, 2018 Report Share Posted October 3, 2018 Spring seems short should be 11.5" , I have a DPMS 308Carbine Spring & its well used & is 11 1/4" & has 29 coils . Buffer is OK for a DPMS based 308 Carbine . Brownells has the Spring you need . https://www.brownells.com/rifle-parts/receiver-parts/recoil-parts/recoil-springs/308-ar-buffer-springs-prod42988.aspx Quote Link to comment Share on other sites More sharing options...
Dr1620 Posted October 3, 2018 Author Report Share Posted October 3, 2018 TY. I'll give it a try. David Quote Link to comment Share on other sites More sharing options...
98Z5V Posted October 4, 2018 Report Share Posted October 4, 2018 15 hours ago, Dr1620 said: TY. I'll give it a try. David Don't skip this thread, David... It's worth reading through, in your circumstance... Quote Link to comment Share on other sites More sharing options...
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