No I haven't purchased one yet! Once I fix this damn blazer I will! I don't like the cheapass commie side mounts. To expound a bit its a picatinny top rail cover replacing original. By all accounts so far Premo system,pricey but what is an accurate shot worth? AK 's can be made fairly accurate! PSL's very accurate!
Try a rail.If still not great try it with out hand hard.If that helps replace it. Also by most accounts PSL muzzle brake/flash hiders often deter accuracy.
Next up good trigger group. Or stone work your yours if your tight on funds like yours truly! My PSL is tight out of the box,every shot helps,same with Ak.If yours is already broke in good. Don't decide its a piece o shit till you pump a lot of rounds through it. Eliminate shit mags too,the source of problems with many autos. I just threw away a Master molder pc o crap mag so thin it was stupid!
Even though Ak's an Ak based guns are durable and reliable lube it up during break in!http://texasweaponsystems.com/
After TWS dogleg rail maybe Rhineland stock and hand guard for PSL.http://www.troupsystems.com/psl%20stocks.htm
All I need is money and time! Both in short supply! Good luck with your Ak and PSL's .THEY can be accurate no matter what AR shooters tell ya!