AK rifles are generally faulted for short sight radius. With Tech Sights, that’s no longer true. Their solution is a rock-solid rear aperture attached to the receiver, not to the dust cover. Dis-assembly is by removing a cross-pin. I first encountered Tech Sights sights on 10-22 rifles at Appleseed training events. They are the standard sight upgrade there.
I think it’s a worthwhile upgrade. They make two versions, one with a single aperture and another with a two-aperture flipper.