The GAU-8 is about 20 feet long. The current M1 is about 32 feet long. It's easily doable. Extending the barrels past the current 32 feet mark is also no problem, if needed.
5 Legislative Days Left Until The AWB Expires
the M1 is 32 feet long counting the barrel!
counting the barrel its like 32.25 feet long... the gun sticks out like 6 feet. it would be hard to do