First out of spec fire control group

Helped my father in law build his first AR (he's an AK guy, and what a better way to earn brownie points), he bought the lower from a friend that owns a shop (FFL). It is a spikes lower with an unknown LPK. With the safety select in safe, trigger pulled back (not even hard) hammer releases! Good thing I did a safety check first, although he's a safe firearms owner and a avid hunter he knows and respects firearms. Since i use all geissele triggers, i swapped out the FCG and that fixed the problem.

Lesson is never assume that all parts are within spec, always perform a safely check!