Customizing your HI-capa is one among the simplest parts of owning such an iconic pistol! The Laylax hi-Capa 5.1 non recoiling 2-way outer barrel may be a good way to try to to just that. The non-recoiling outer barrel sets the inner barrel using 2 grub screws so as to repair the outer and inner barrels together so as to make a stable firing platform and reducing all movement between the outer barrel and slide (Blowback of the slide still performs normally). This barrel includes 11mm internal threads, with an adapter to 14mm, and a non-threaded adapter included as well!