I just checked Numrich- they list 21 used barrels for 12 gauge M12’s (all std 2& 3/4" chamber)of those, 9 are either 28" or 30" mod or full (as stamped) and cut off- from 18 & 1/2" up to 27 & 1/2"–there were a few trench and 20" riot barrels listed in the remaining 12 barrels- prices all over the map- So– I have a 12 gauge barrel from a 1937 field grade M12- WPS- Full- that lost a few inches due to snow and mud while late season goose hunting- it is now 26" from threads to muzzle instead of the original 30- and cyl. bore- just the barrel, no magazine tube or other parts- For Sale at $60.00 plus shipping-Sold as of 7/25– but I have a 12 gauge Nickel steel solid rib from a 1924 field grade- marked Full but with a Deluxe Poly-Choke (vented) installed- 27" OAL white bead-complete barrel and magazine and forearm unit- bore is Mint- good original rust blue- 18 ring corncob style forearm 100$ intact $350.00 plus shipping-