A developer has posted unfinished digital files for a Glock 19.3 PG-FCU firearm project so testers can try them while work continues. The release is not treated as complete or proven. Feedback is sought on whether the files open correctly in Bambu Studio, OrcaSlicer, PrusaSlicer, Cura and similar programs, plus reports of missing geometry, warnings, organization problems or documentation gaps. At least five shell designs are intended later, and separate conventional frames without the PG-FCU system remain only under consideration. The files are experimental with no claims of function or safety, users must follow the law, and a thanks document credits earlier public remixable work without implying those authors endorse this project.