RECENTLY INSTALLED ON IN A "RUA" GM FRAME & IT DID REQUIRE SOME MINOR FITTING WORK WITH FILES & FINE SANDPAPER. BE SURE TO THROUGHLY DEBURR BOTH FRAME HOLES AS WELL AS THE INSIDE OF THE FRAME WHERE THE PART IS DESIGNED TO FUNCTION. ONCE THAT IS DONE, THEN FIT THE PART TO THE FRAME !!!! DID NOT COME WITH A SPRING OR CATCH LOCK. AN AWESOME QUALILTY PART FOR THE $$$$ SPENT--OORAH & S-F !!