That's a decent page for reference but it isn't 100% accurate and is far from complete.

Yours is one of the transitional RSRs. It has a 3rd gen frame but a 2nd gen slide. Without seeing the right side, I can't tell if yours has the 2nd (screw) or 3rd (internal plunger) safety lever. Yours has a 3rd gen frame so it will take the same grips as a 5906, etc.

AIP means Automatic Improvement Program and is also the three letter prefix that one of the 'transitional' models carried. This AIP has seen it's share of use...