Never had a problem with my MkII BV, mine is pre accurtigger but has a rifle basix trigger installed. Shoots one hole 5 shot groups with ease at 50 yards. Never had a problem with the mags and my rifle has seen probably a couple thousand rounds now, using the stock 5 round mag and a 10 rounder.
For a first rifle, I'd definately suggest getting the upgraded laminate stock, worth every penny!