If you're trying to find an improved housing for the original FI-eggs SCS files with a 5.5mm pin, this is the file that you're looking for.
If you're starting from scratch and haven't ordered from SCS yet, I would advise instead using the "Sqweeeeeeee Branch" files on my profile, which has improved SCS files and uses a more readily available 5.5mm pin.

20260215_Rev4 - Added hole for a forward stop. Place a paperclip here and bend both ends into the slots to keep it in place. This will keep the lever from falling too far forward as it loosens up, which can bind under the firing pin and block the bolt carrier from moving rearwards.

20250915_Rev3 - Removed the wedge, and replaced with a hole for a 0.3x3mm OD compression spring. Rev3.1 added the small hole in the rear of the housing to apply epoxy. This version does not require custom filing for individual rifles like the wedge version tended to, and has run flawlessly for the several individuals that have tested it with me.

This is my modified version of Fl-Eggs’ modified version of the Kabuto Trigger Usage Reset Device housing, and is designed to be used with Fl-Eggs SCS design (sailing on the sea). It addresses the issue of the cam lever going too far backwards and getting hung up on the bolt carrier. Included a couple of reinforced selectors as well.

LBRY Tags: kabuto; turd; frt; fosscad