"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 "
— Item examination - Japanese

"It's a supressor with the effect of reducing gunfire noise. It can be mounted to a handgun."
— Item examination - unofficial translation

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.

However, it very likely that this item was supposed to be combined with those handguns to create Handgun A Silenced or Handgun B Silenced.

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