Have you asked to use his barrel on your lv1? I use a empire nightsick which i was given with my first mini i baught, i think its .691 bore, only reason i use it is if i pull off a bum move and snap it, i wouldnt be upset. The debate of underboring, overboring and improving accuracy is never ending, but the only real performance changing things ive found is a clean marker and the paint i use... X