what mags do you use?
Just thought I'd share a pic of my build in 7.62x39
Runs like a dream
LAR 10 round pistol mags with couplers. In canada we can only have 5 round mags for centre fire rifles. Pistol can be 10 rounds. So the LAR pistol mags fit the bill nicely, coupler gives me 20 rounds ready to roll.