i purchased my PC9 new..i still have, and WILL KEEP IT. i have a close relative who has the PC9 & PC4 and who will NOT part with, too...
right now it's wearing a vortex, strike fire, red/green dot that works very well.
my experience with the trigger and accuracy are all good.
the trigger, from the factory, weighs in at a 6.5 lb pull as per my RCBS trigger pull scale...no worse than my AR. some polishing and lighter springs (if they were available) would lighten the pull even more if wanted.
while it's not a 'tack driver' it's certainly accurate enough to be able to hit all, but the most minute of, targets at almost any range out to 100-150 yds. i have not worked with handloads to get optimum accuracy from it but i am confident it may reach levels of accuracy that's guaranteed to surprise.
the weight? well...i was trained with an M1 Garand...i find some weight as being desirable. even my M4 has some "weight" to it...
the PC9/4 is, IMHO, a very fine carbine, that should not be underestimated for ANY application. it's too bad it didn't sell better.