I just bought a cheap $89. 16" barrel from Sportsman Guide. It looks like it would be a good candidate to cut down to around 11" (M4 profile) and re-thread.
Might be a good project for next couple of weeks.
NRA Instructor: Pistol, Home Safety, Personal Protection, RSO, Reloading.
NRA Life Member, NRA-ILA Sustaining Member, AZ CCW training org. & instructor, AZ HE instructor.
JWsGUNs.com FFL-07, NFA SOT-C2.