I had the opportunity to talk to model 1 Sales about this question.
They said if the MP 10 is a Type 1( bolt release) DPMS pattern then their 308 Upper should fit and function.
They also said the return policy is 10 days minus shipping cost for refunds.
Has anyone used a Model 1 Sales Upper on a SW MP 10 lower?How did that go?
SW doesn't sell SW MP 10 bolts or uppers and I wanted a new configuration of 308 rifle in 20" with a few finer features. The 20" 308 that model 1 Sales has cost about $1200 full customized. If I'm going to spend that much I want to get as much info as possible