It’s a basic budget build for a budget round. I didn’t want a high end build for this so I went cheap with a generic Cero Forge Upper/Anderson lower/UTG Forerunner (Titanium barrel nut) handguard. Gas block is a non-adjustable steel (.750 set screw type) from Luth-AR. I know some folks say you need an adjustable gas block for the round in an AR. I bought one and didn’t end up needing it for this build.
For reliability with steel case/comm bloc surplus you want extra power hammer spring (
https://www.blackriflearms.com/Enhanced-Power-Hammer-Spring_p_685.html) . That means no cassette triggers. I use a Larue MBT-2S and it sets off every time with the EP spring.
Use an enhanced firing pin that is a little longer to set off comm bloc/steel case.
BRA (
https://www.blackriflearms.com/7.62x39BoltandEnhancedFiringPinCombo) and RTB (
https://www.righttobear.com/7-62x39-ar15-bolt-completion-kit-enhanced-firing-762ekit/) sell them. I use the RTB bolt/pin and no issue. I keep a BRA pin as a backup if one breaks.
I’m using a Crimson Trace Series 3 1-5x24 FFP on top and accuracy is limited by the ammo I shoot (cheap stuff), so it’s been 1.5-2 moa at 100 yards with just blasting. I have no doubt the barrel is capable of better so I’ve recently picked up components to start reloading the caliber. I’d sworn I wouldn’t add another caliber to reload, but the POF barrel really impressed me even with crap ammo. I’ve recently picked up some brass cased ammo to see if I can get more out of it and I’ll use those empties to reload.
Magazines are another key component. The Duramag 28 and 10 rounders are all I use.