There is a lot of data on here of full PSA rifles being fixed. Some of the guys have had good luck and gotten rifles that seem to function OK, but many have well documented issues that were easy to fix and PSA just doesn’t seem to want to change. Some of the parts you will need to stick with PSA on. You’ll want their upper receiver for certain and I’m not sure what other pieces they have that are proprietary. If you read through a few of the “fixing” threads, you should get a pretty good idea of what direction to go to make sure you get a well functioning rifle when you’re done. Get the right recoil system straight out of the gate, pick a decent barrel and you’ll be off to a good start. You don’t have to spend a fortune to build a solid rifle, but know what you’re buying before you get it and you’ll keep the headaches to a minimum if any at all.