10mil. Just thought I would add my experience (limited so far) with the HiPoint pistol. So far only a couple of hundred rounds fired, but nary a single hicup. Pretty accurate too. I've shot both fmj and hollow points with zero problems and fun to shoot. Mine is the C9 compact 9mm.
BTW. I also have a SA 1911 "GI" upgraded and the S&W 22A and both are fun to shoot too.