20 gauge M2 questions

[CollectingDigits]

I own a 26" M2 20 gauge in apg, I have found conflicting info saying they only made 24 26 28 inch barrels but I have seen people selling M2's with a 21" barrel,  I world like to have a 21" barrel and a compact stock installed, is this possible? If so where to buy? Thanks!

[kwild835]

24" is the shortest barrel made for the 20ga M2.
They did make 21" in 12 gauge.
You have to have the barrel cut to go less than 24"

[CollectingDigits]

Thanks, a good friend of mine educated me on this briefly after posting. i appreciate the feedback. any thoughts on locating a apg 24" ?