I was burned a couple years back on a rifle built on a Yugo kit with the flip up rifle grenade sight that also disables the gas system. The best advice I can give is to be sure that the builder has a good reputation, and a little research is never a bad thing. Take a look at the country of origin for the kit the rifle was built on, what type of ammunition do they use (corrosive/non) are the barrels chrome lined, etc?
Good Luck.
Blake
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