Sylvestre Sports in Bonneyville is bringing in the Jard J180 build kit later this month. It uses direct gas impingement from a gas tube instead of a piston to activate a 180 style recoil harvesting system, so you would be able to re-use more parts, like the barrel, gas tube, and handguard from your M and P 15; pretty much everything outside the receiver proper. The Jard trigger is also supposed to be nice, but you could likely swap the trigger in as well, if you wished.
Spectre Ballistic International (aka SBI, not to be confused with Spectre LTD, Wolverine's first partner on the MCR), is intending to release their own DI 180 upper, but the release date is to be determined. It will sit on the WK/MCR/AR180B lower they just released. (SBI released their lower early when, to add to the confusion, Spectre LTD released their own custom 180 lower).