Another thing, build your lower inside a clear freezer bag or trash bag.That when (not if ) something , (one of the spring loaded detents ) goes pinging it stays in the bag instead of getting you in the eye or getting lost.
Safety glasses? I wear them all the time at work and at home when working on my Jeep but not when I work on my guns. Just popped into me wee leetle head when I read that-safety first