Here are pictures of our M&P15-22 17 mach 2 conversion. The Labor is $150 without muzzle threads and $225 with muzzle threads, plus cost of the barrel which ranges from $100 – $400 depending on material and brand. Barrel pictured is 20 inch stainless Krieger , however we can do any Cerakote finish in most colors , and we can cut the barrel to any length between 16 inch and 24 inch. We are happy to use a customer supplied barrel blank however we cannot guaranty accuracy that way.