Is there a threaded barrel that will work with the S&W M&P compact 3.6".

If not, will a S&W M&P compact 4" work in the 3.6 and give enough length to thread? I'm thinking it is too short since the .4" difference is not 1/2" as in 1/2x28.

If that won't work due to the length for threading, would a full size barrel work and be able to be cut down?

Thanks.

TED