I had a PSA parts kit come with a cracked mag catch. I emailed and they dropped a replacement and an extra in the mail to me the next day. I'm sure everyone makes a bad part now and then, seems that PSA will make it right when it happens.
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I've got a PSA rifle and an LPK in my Noveske chainsaw gen 1 lower. Only issue I've had is that the bolt catch was tight on the Noveske. A few hits with some fine sandpaper and a good dose of CLP took care of it. Like other have said, their triggers are pretty bad, but after shooting a Geissele S3G, I'm a little spoiled. :)
I think it's safe to say the general consensuses is that the parts will work, just be prepared to have to swap out the trigger. I didn't throw mine out, but then again I don't have tons of disposable income, so I've made it work. :)
I didn't care for trigger and selector lever on their cheapest parts kit.
In my opinion, PSA can't be beat for an inexpensive budget build that is still high quality. I have multiple PSA rifles that I've built and they have all been completely reliable so far and good quality. They probably aren't on par with a BCM, Colt, DD, etc., but for a milspec gun at a crazy low price, they beat the hell out of DPMS, BM, Oly etc.
I agree that their triggers aren't great, but I've just swapped those out and kept them as back ups. Like others have said, they do offer different quality parts though, so read the parts list thoroughly.
I have two psa lpk's and think both are smoother than my 6920 trigger.
Read carefully before you buy their premium line is good to go. I am very happy with my purchases.