Jody, please clarify…are you proposing to market 80% lowers specifically for the 15 22 for the purchaser to complete, or are you offering the machining service to complete an available existing 80% lower to 100% for the S&W 15 22 application?

If it is the first option, go for it, I wish you the best of luck.

If it is the second option, have you considered…

All the 80% lowers I’ve ever seen have the pivot pin holes already drilled, which precludes using a stock S&W 15 22 upper since the front pivot pin hole is lower and farther forward in the S&W 15 22 upper than in a mil-spec AR upper.

Also, the magazine wells are already broached in an 80%, so that means the 15 22 mag will have more “wiggle” room fore and aft since it’s body length is just slightly smaller in the cartridge length direction than a 223 magazine body.