Originally Posted by jackmountain
Originally Posted by MontanaMarine
Originally Posted by johnw
I guess I never considered a 7.62x39 in an AR.

Suppose I have a RR lower with a JSE 5.56 upper. Also a selection of mags for the 5.56.

What all would i need to do to put and operate a 7.62x39 upper on it? Or do I need a lower designed just for it?

All you need is an upper in 7.62x39, and magazines for the 7.62x39.

If you get an upper from Palmetto State Armory, it will come with an enhanced firing pin. It's a little longer to work with the deep seated and hard primers on steel case ammo.

For magazines you want the DuraMags.

The steel case ammo works best with a heavy milspec trigger. The heavy hammer and spring get the round on it's way.

Tried for months to get an upper from PSA, consistently out of stock. Wound up grabbing a 300BO upper for cheap since I had 1000rds of ammo. Have many 1000’s of rounds of x39 that’s relegated to AK duty now.


My 20" mid-gas 7.62x39 upper is from AR15Parts.com. I haven't had any issues with it either. They have a few in stock,

https://ar15parts.com/upper-assemblies/7-62x39-uppers-ar15/


I picked up my 16" upper from PSA a couple years ago. At that time they were on sale for $239, with BCG and CH.