I had a new to me, hk sear and 4 clone hosts. Couldn’t get 3 hosts to run right so I personally took them to Jeff at PCS. He took the time to stop what he was doing, looked over all 3 and could tell immediately what the fixes were for 2 of them. Replaced 2 parts, and did a lot of extra stuff; tweaked a few things; shelf height, springs, etc and smoothed out the bolt/receiver contact in one point. He took me to his range and all 3 ran 100% and remained 100%. Took less than 2 hours total.
He’s since answered a few questions over the phone on some more recent clone purchase issues too.
Have much respect for him!