I don't think the piston retrofit kits (Adams Arms.etc etc) are as well refined as the piston rifles made complete from some of the manufacturers. From the reading i've done about these "kits" they suffer from many of the ailements that pistons are known for having. Those big manufacturers like (LWRC. POF etc. etc.)have worked out all the kinks.
no put put your words in doubt, but for educational reasons, what are those problems that pistons are known for having?