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My favorite is a MGI lower with an AK magwell. The upper receiver and carrier needs to be relieved, as the feed lips of AK mags are thicker. DI shoots softer than the AK long stroke piston.
Scott
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+1. With the RLL, I don't know why you'd bother messing with the 'franken' mags. Get your self some kind of lower that takes the unmodified AK mag. I have several MGI's as well the original AR47 before the MGI came out.
All work 100% with my RDIAS. Friend of mine has a RLL and runs an MGI lower also.
I started out back in 2001 running the AR/AK 'franken' mags back before the 7.62x39 ASC or C - Products mags existed.
I had some good 'franken' mags and had so much fun with it (back when going rate for 1000 rounds of 7.62x39 was around $75) that the party was just getting started at 30 rounds. I wanted to run a 75 or 100 round drum.
I now have (3) 7.5 or 8" 7.62x39 uppers, 10.5 and 16" Colt barreled (carbine gas) and a 16" Mid gas 7.62x39 uppers. Most are using DPMS Lo pro or 'hi rider' uppers that have been clearanced for the wider AK mags/drums.
But now you can get PSA KS-47 upper that is billet machined and already machined to take the AK mags/drums.
http://palmettostatearmory.com/psa-ks47-stripped-upper-receiver.html
BTW, they have some low cost 10.5" barrels also...$80...
http://palmettostatearmory.com/psa-ar-47-762x39-10-5-barrel-nitride.html
Worth considering since you'll be burning it out in full auto.