"射撃音を軽減する効果を持つサイレンサーだ ハンドガンに装着することができる "
"It's a supressor with the effect of reducing gunfire noise. It can be mounted to a handgun."
The Handgun Parts B (ハンドガンパーツＢ handogan-pātsu bī ) is an item which was intended to appear in Resident Evil 0 during its GameCube stage of development but was removed in the final release. You can get it in the Biohazard 0 TRIAL EDITION with the help of cheat devices such as Action Replay MAX or GameShark; however, it lacks a 3d model as well, and if combined with Billy's or Rebecca's handgun, it yields a Hatchet.