I have worked on a few and they were horrible. I tried to rebarrel one that was cut short and the op rod would not move without severe pulling.. A handful of others had op rods pop out of there track. Their Junk and this is first hand experience from someone who has handled them and has a great reputation for helping people for free in the Garandicon world. I rebarrel for free and had to take 5 apart in order to scrap them and put a real receiver on the barrel. Rick Bicon