4. A semi-automatic center-fire pistol that expels single or multiple projectiles by action of an explosion of a combustible material that has the ability to accept a detachable magazine and has one of the following characteristics: (i) a folding or telescoping stock; (ii) a thumbhole stock; (iii) a second handgrip or a protruding grip that can be held by the non-trigger hand; (iv) the capacity to accept a magazine that attaches to the pistol outside of the pistol grip; (v) a shroud that is attached to, or partially or completely encircles, the barrel and that permits the shooter to hold the pistol with the non-trigger hand without being burned; (vi) a manufactured weight of 50 ounces or more when the pistol is unloaded; (vii) a threaded barrel capable of accepting (a) a silencer, (b) a flash suppressor, (c) a barrel extender, or (d) a forward handgrip; or (viii) any characteristic of like kind as enumerated in clauses (i) through (vii);