870 help needed

[huddles]

Hello all, I bought an 870 express. the seller indicated it will take up to 3". The info stamped indicates it will take 3" in Magnum receivers. How can I tell if it has this?

serial number ends in M. is this important?

cheers,

P

[fknipfer]

My 870 is stamped on the receiver 870 express magnum, so I always assumed it meant it was good for magnum rounds. The barrel is stamped for 2 3/4 and 3 inch shells.

fknipfer