Very disappointed - SAM 04-06031-01 M&P SHIELD POCKET COMPENSATOR BK 040603101

This is a great looking compensator for a Shield/Shield Plus, and the mounting setup is also praiseworthy. I really wanted to like this. But the one I received was defective as the inside threads on the "thread protector" portion were poorly machined and it would not go on my SilencerCo Shield barrel. My barrel is not the problem, the threads on the Sampson comp were visibly defective. It looks like other people received good ones, and I just got a bad apple. But I'll move on and try a different brand - basic quality control fails on something is straightforward are a no-go for me.