So a couple of things. First, since your man likes AK's, you should consider a 300 blackout AR15 pistol. It will be very comparable to his AK is many aspects. Second, depends on what state you live in for all of this, so that is important. Anyways, get a 30 cal brake with an out the front cover. It will help reduce the kick, and also send sound down range rather than to the side. Next, arm brace, but add on a folding stock attachment. As for barrel, get a nitrided barrel. They will be more accurate than the chrome ones, and last as long if not longer. That's been a back and forth battle for years which is better. Most people don't shoot 10k rounds of both to compare. I like to buy parts on deltateamtactical. It's the walmart of gun parts, so not the best quality always, but none of my guns have failed me. If you've shot enough, get a 3 pound trigger. It makes everything complete. Good luck. You will shoot better with an AR if you get a scope, compared to his AK. They are usually pretty worn out by the time normal people own them. So usually not the most accurate.