|Perfect fit for my RRA AR15.
Would have been nice since I am not a gunsmith for some instructions, but I figured it out.
There is a small Allen screw that holds the switch together that I thought was rivet, I finally stuck a small Allen wrench in there to find it was a screw. Other than that I looked on you tube, all AR15s are basically the same. I put a little blue thread lock on the screw before final assembly. Happy shooting.|