Take note of the bold word for future questionable parts reference.
If it isn't on this list, it isn't SSP legal.
PERMITTED Modifications (Inclusive list):
1. Sights may be changed to another conventional notch and
post type (see “sights” in glossary for further information).
2. Grips may be changed to another style or material that is
similar to factory configuration (no weighted grips; see
“weighted grips” in glossary for further details).
3. A slip-on grip sock and/or skateboard tape may be used.
4. Internal action work may be used to enhance trigger pull as
long as safety is maintained (no visible external modifications
allowed).
5. Reliability work may be done to enhance feeding and
ejection.
6. Internal accuracy may be worked to include replacement of
barrel with one of factory configuration and original caliber.
7. Plastic plugs may be used to fill the opening behind the
magazine well.
8. Custom finishes may be applied.