In armed service parlance, the letter “X” connected to an item’s nomenclature normally means experimental. In no way is… Subsonic Ammo: When You will need a quiet shot in the sphere, trust in ammo that gained’t break the sound barrier. Subsonic ammo creates a lot less sounds than conventional ammo. https://emiliorjyoe.bloggazzo.com/25892114/considerations-to-know-about-38-bullets-for-reloading