Originally Posted by VitSports6
not with anything in particular, Just some fine tuning of my mutt
Thanks for asking
I built three from Mod 1 Sales kits years ago. A 16" carbine and two 20" full size rifles. All 3 have ran 100% from day one with DPMS frankenmags and Yugo brass cased ammo. I built one of the 20" rifles for my oldest boy, so really I only have 2 but get to shoot all 3.
Over the years I have noticed a few things about mine. Don't know if any of this can cross-apply to the other makers or not?
First thing, ammo has not been an issue. All I've ever used in them is the Yugo brass cased military surplus FMJ. I bought a lifetime supply years ago on the cheap. I have tried mixing ammo, Russian hollowpoints, Chinese FMJ, E. German FMJ, etc. in the same mag and didn't like the results so I just use the Yugo fulltime in these ARs.
A few years after I built these, CProducts came out with their 7.62X39 mags. I bought a few 10 & 30 rd mags. These first gen. mags were junk but I did learn a couple things by trying to make them work.
The front to back slop in the magwell with these rifles really made a difference on dependability. When you push-pull on the bottom of the mag the tighter the fit, the better they ran. Side play didn't seem to matter much but front to back was a deal-breaker. Lucky for me I had used Superior Arms lower frames on two of them, they seem to have the tightest magwell fit, changed out the 3rd one and all are GTG.
I also noticed that when I tweeked the feed lips to get the mag to run 100% in one rifle, It might not be right for the other rifles. Weird, but thats the way it worked.
The latest gen of CProd mags pretty much just plug & play, if you have a tight magwell. I have had to do a minor tweek on the feed lips of a couple, no big deal. I should say too that the DPMS frankenmags have always been 100%, never had to mess with any of mine. I still pick them up when I can find them cheap.
With a good mil dot or range finding scope, 250 yds is no problem for the 7.62x39 yugo ammo thru a 20" AR and its very impressive at 100 yds.
I don't recommend these to anybody, but it seems like a lot of people who have shot mine end up with one or two. I think this is one of those things you buy just because you want it, then it grows on you and you keep it. I still have mine!