Shot my SU-16CA for the 1st time today. It's an 09' with about 500-600 rds from previous owner. I put about about 300 + rds of Rem UMC FMJ (.223), some JHP, and about 80 of PMC X-Tac (5.56) thru some 20rd PMAGs. Didn't even bother with the Kel Tec mags. All I did was give it a good cleaning and lube (Frog Lube) the night before and the gun
performed like a CHAMP on range day!
Zero issues 
..Zeroed the scope up to 100 yds today and was dead-on til I tired of shooting.
My only dislike. Taking the short hand guard on/off. I think it's missing a rear retaining clip, so it was a pain in the *$$ to put back on. It might just be me too

I should of left it alone, but I wanted to switch the sling swivels to the other side. I ended up going sans sling, since i just couldn't jive with it.