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Posted: 1/29/2016 1:34:05 PM EDT
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Built my first AR and went right to 7.62x39 because I like the round. Just finished the build and planning to go to the range this weekend to function check it and get it zeroed on my cheap red dot. Going to try and run ASC 30 round mags, Have dry lubed the spring and follower and considering shaving down the front lip of the mags as I have seen people do that to limit the edge of the case catching.
Running an Anderson Lower with a PSA lower kit and a PSA polished trigger group. Bought a complete PSA upper with BCG and CH 18" barrel PSA stock kit Carbine Buffer My question is what modifications are a good thing to do if I have feeding issues- I have read about polishing the feed ramps and even dremmeling out the feed ramps to form one ramp. Are these things that many of you do or is it crazy talk? |
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If you have feeding issues, try modding the magazines as well as buying some of the "gen II CPD magazines".
If you turn your frustrations to your upper receiver, start off with polishing. Unless you're 100% competent that you won't f*ck up your barrel extension trying to do that scalloped feed ramp. |
| I have a new ASC mag as well as the new GenIII CPD mags. I couldn't see any difference in the front of the mags, at the feed area. I went ahead & ground that area down, maybe a 1/16th of an inch, just so I wouldn't have any hangups. While both brand mags look very similar the spring on the CPD is much longer, where the ASC uses a flat wire spring for what that's worth. I really want to get this build up & running, so I can find out for myself what mags work. Trying to research 7.62 mags is like the .45acp/9mm wars. I hope I can go with the ASC mags. I hate anything that's Teflon coated. I'd like to paint my mags to match my rifle, without having to blast the damned things. I'm getting to the point where I need to look at the feed ramps. Don't know if they just need to be polished, or if I should hog them out, like Bushmaster did. Oh well, that's what makes this so much damned fun. |
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I would test fire all your mags before modifying them as most setups don't require ASC mag modifications with production from the last few years. I would also test fire your system, as is, because it may work just fine as you have it.
Test firing will allow you to identify then fix any issues the system may have, such as light primer strikes or feed ramp angles, etc. |
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I have the latest gen C-Product mags. All I have done to mine are add Wolf extra power AK 47 springs and I also cleaned off any defects on the feed lips with a small round diamond file. This is the round surface where the case rides along. I have a Sprinco blue spring in my M4 buffer tube. I can't see how cutting the front of your mag will make a difference. If they are nose diving, they will still do so, unless I am missing something.
I will also add that the two DPMS franken mags that I bought years ago have always run like gang busters. I wish they still made them. |
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My 7.62x39 is built with an A2 upper with the old rifle feed ramps.. In theory, I would think it would be more prone to feeding issues than one with m4 feed ramps. I've had zero issues with it. I use ASC mags.
I'd go out and put it through the paces before you go nuts with tweaks. We've built two now, (the other has m4 feed ramps on the upper) and they both have worked reliably right out of the gate. To be honest, I'm a bit confused by the conventional wisdom that 7.62x39's have feed issues. |
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Quoted:
My 7.62x39 is built with an A2 upper with the old rifle feed ramps.. In theory, I would think it would be more prone to feeding issues than one with m4 feed ramps. I've had zero issues with it. I use ASC mags. I'd go out and put it through the paces before you go nuts with tweaks. We've built two now, (the other has m4 feed ramps on the upper) and they both have worked reliably right out of the gate. To be honest, I'm a bit confused by the conventional wisdom that 7.62x39's have feed issues. +1 When using most new components these days, there shouldn't be any issues. I built my most recent one, and used ASC mags (I like the 20 rounders). Besides for my first bolt breaking a lug off (damn you Tactical Ambush) it has been 100%. Only ran about 250 rounds through it, but no typical mods needed. |
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Quoted:
My 7.62x39 is built with an A2 upper with the old rifle feed ramps.. In theory, I would think it would be more prone to feeding issues than one with m4 feed ramps. I've had zero issues with it. I use ASC mags. I'd go out and put it through the paces before you go nuts with tweaks. We've built two now, (the other has m4 feed ramps on the upper) and they both have worked reliably right out of the gate. To be honest, I'm a bit confused by the conventional wisdom that 7.62x39's have feed issues. Both of mine did with CP mags. I would say that higher than 87% of CP mag users in 7.62x39 had feed issues. There are tons of threads around here about it. I am glad you have two unicorns. 
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Both of mine did with CP mags. I would say that higher than 87% of CP mag users in 7.62x39 had feed issues. There are tons of threads around here about it. I am glad you have two unicorns. Quoted:
Quoted:
My 7.62x39 is built with an A2 upper with the old rifle feed ramps.. In theory, I would think it would be more prone to feeding issues than one with m4 feed ramps. I've had zero issues with it. I use ASC mags. I'd go out and put it through the paces before you go nuts with tweaks. We've built two now, (the other has m4 feed ramps on the upper) and they both have worked reliably right out of the gate. To be honest, I'm a bit confused by the conventional wisdom that 7.62x39's have feed issues. Both of mine did with CP mags. I would say that higher than 87% of CP mag users in 7.62x39 had feed issues. There are tons of threads around here about it. I am glad you have two unicorns. That is prob with old CP mags not the new Gen3 CPD mags. I have been using 8 of them for over 3k rounds and they have not shown any problems, zero. |
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Built my first AR and went right to 7.62x39 because I like the round. Just finished the build and planning to go to the range this weekend to function check it and get it zeroed on my cheap red dot. Going to try and run ASC 30 round mags, Have dry lubed the spring and follower and considering shaving down the front lip of the mags as I have seen people do that to limit the edge of the case catching. Running an Anderson Lower with a PSA lower kit and a PSA polished trigger group. Bought a complete PSA upper with BCG and CH 18" barrel PSA stock kit Carbine Buffer My question is what modifications are a good thing to do if I have feeding issues- I have read about polishing the feed ramps and even dremmeling out the feed ramps to form one ramp. Are these things that many of you do or is it crazy talk? As all before me said - feed problems are magazine related 99% of the time. From what I've read, there is only one brand of magazine that actually works properly - C Products Defense. https://cpdmags.com/ I built a 7.62x39 AR using a Radical Firearms upper (not known to be the best in the world), a Bushmaster lower with RRA LPK, and a wooden stock (AK round - needs a wooden stock). I bought CPD mags and the rifle runs like a Swiss watch. 
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Quoted:
As all before me said - feed problems are magazine related 99% of the time. From what I've read, there is only one brand of magazine that actually works properly - C Products Defense. https://cpdmags.com/ I built a 7.62x39 AR using a Radical Firearms upper (not known to be the best in the world), a Bushmaster lower with RRA LPK, and a wooden stock (AK round - needs a wooden stock). I bought CPD mags and the rifle runs like a Swiss watch. https://c1.staticflickr.com/1/275/19029585116_b374794db7.jpg Quoted:
Quoted:
Built my first AR and went right to 7.62x39 because I like the round. Just finished the build and planning to go to the range this weekend to function check it and get it zeroed on my cheap red dot. Going to try and run ASC 30 round mags, Have dry lubed the spring and follower and considering shaving down the front lip of the mags as I have seen people do that to limit the edge of the case catching. Running an Anderson Lower with a PSA lower kit and a PSA polished trigger group. Bought a complete PSA upper with BCG and CH 18" barrel PSA stock kit Carbine Buffer My question is what modifications are a good thing to do if I have feeding issues- I have read about polishing the feed ramps and even dremmeling out the feed ramps to form one ramp. Are these things that many of you do or is it crazy talk? As all before me said - feed problems are magazine related 99% of the time. From what I've read, there is only one brand of magazine that actually works properly - C Products Defense. https://cpdmags.com/ I built a 7.62x39 AR using a Radical Firearms upper (not known to be the best in the world), a Bushmaster lower with RRA LPK, and a wooden stock (AK round - needs a wooden stock). I bought CPD mags and the rifle runs like a Swiss watch. https://c1.staticflickr.com/1/275/19029585116_b374794db7.jpg I have 5 20rd ASC mags and they have been perfect. Nothing I have read, first hand experience. No lies 
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All my 7.62x39 mag problems were due to rounds either not coming up fast enough or nose diving so low they couldn't clear the magazine. I did a lot of filing on both my ASC mags and my feed ramp on my first build, then I figured out my early ASC mags had the same springs as standard AR 5.56 mags. I dropped in some AK springs (lost two rounds of capacity) but by this time I had my mags reamed out so much they'd work 99% of the time.
When the new CPD mags came out I grabbed one, worked 100% first time, no mods. Later picked up a PSA AR-47, CPDs run 100% in that unmodifed rifle as well. The modded ASCs will still occasionally jam in the PSA AR-47. And the unmodified CPDs work every time in my reamed out first build. All my ASCs are over 4 years old so newer ones are probably MUCH better. But even the ACS 20s I picked up last year w/flat wound springs would occasionally jam in the PSA so I dropped in some springs from some old 6.5 Grendel mags. |
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