I sold my FAL 'cause feeding it was getting to cost too much. I don't have space for reloading set up, etc. and 50c/r is a tad much to really enjoy shooting much.
So building an AR to shoot 762x39. Thought briefly about the PSA KS-47 (AR that takes AK mags) but while I could've gotten my desired config built up, it would've been rather costly. So economics overruled, and I went with a standard AR lower. I'll be running mags from CPD.
PSA standard lower, "Enhanced" LPK from JoeBobsWarehouse w/ the Ergo grip option (well worth it - nice trigger for a "milspec" type and I'd order an Ergo grip anyway). DoubleStar ACE ARFX stock finishes off the lower.
Upper starts with a Spartan non-reciprocating side charging upper, think they are made by Gibbz - certainly same design. Barrel is from bearcreekarsenal.com - they guarantee MOA or better from all 16"+ barrels with whatever ammo they specify (Hornady SST 123grn in the case of my barrel). Toolcraft bolt carrier group. Handguards are a no-logo deal I got from Primary Arms on a killer sale at just the right moment, KAC low-profile gas block and stainless gas tube, some UTG "slim" fixed sights (I have a set already - they are nice), a standard A2 style muzzle device, and a inexpensive red dot (AT3 RD50 - under $100, 2moa, and lifetime warranty).
As you can see the charging handle doesn't stick out too far - pretty cool set up. Manual of arms is VERY familiar if you are used to the FAL type

For those of you that play with tax stamps, the gate that is where the charging handle gap would normally be is supposed to do a better job of blocking gasses than a standard upper w/ charging handle in place.
Closer up