Out on our first date. Ran through 300 rounds of 28 year old CCI MM that I had lying around. Only 1 FTF. I love this little gun. Definitely NOT a Marlin 60.
http://smith-wessonforum.com/smith-wesson-m-p-15-22/140262-adding-qd-sling-swivels-my-1st-gen.html
Going to do mine in a day or two. Probably best to use a drill press if you have one available.