When I took the 522 carbine to the range first, I had a (broken) red dot sight with it — predictably, the results didn’t look useful until I removed it and used iron sights. The gun comes with several front sight posts (held in with a screw) but the one I had installed — a “big dot” type was not conducive to precision shooting. So I returned with a Primary Arms 1-4x scope.
I really like that scope: it’s cheap, sharp, fairly bright and holds more recoil than I am willing to experience myself. I’ve also been converting most of my rifles to Magpul type 2 slings.
For lack of a front sling loop, para cord around the sight tower had to do.
The ribbed surface is rubber and feels nice in hand. The charging handle would be a little longer.
The carbine has a good trigger. At 25 yards, I put most of a full 22-round magazine into one hole, losing my concentration on one shot. To me, this seems adequate for a plinker. Ammo: bulk Federal from 550-rd box. I did not have the time that day to re-shoot without a flinched shot. The gun runs with 30 or 40 grain ammunition equally well, and accuracy is also similar.