Awesome, glad it was a relatively simple mod! This chassis seems like the perfect suppressed FRT platform. Gonna be keeping an eye out for a full-size now.

Love the build! Is there enough space behind the slide to accommodate weighted backplates for suppressed FRT use?

The Stack-A-Gat19 by SCSM would be a pretty good start. A mostly milled Harlot seems doable since the side plates are printed flat. Honestly, a lathe may be a better option since it opens up making barrels, launcher hulls, anything cylindrical etc.