Will 870 mag extension fit a norinco m37

[wrinkles]

Will a 870 mag extension fit a norinco m37? What I mean are threads and diam the same?
I know that the lug welded at the end of my currrent mag tube gets in the way but if it wasn't there will the mag extender work?

 

[dfariswheel]

No, different threads and mounting system.

During the Vietnam War, the US Naval Weapons Lab at China Lake built the first extended magazine Ithaca Model 37 shotguns for Navy SEAL use.

In order to extend the magazine, it was necessary to add a longer, one piece magazine tube, and to move the barrel mount forward to the muzzle.

This took some doing, since the barrel mount is brazed in place.

Bottom line is, unless you're up to some VERY heavy-duty gunsmithing, altering your gun just isn't practical.

One "possible" option is to find out if a genuine Ithaca barrel will fit the Norinco, buy a Ithaca extended magazine and a new extended magazine barrel, and install them.

I rather doubt the Ithaca barrel and tube will interchange with the Chinese copy.

 

[wrinkles]

OK, I hoping the threads were the same. I've done serveral pistol, and rifle mods so I wouldn't feel uncomfortable cutting the lug and moving but I don't want to have to weld the extenstoin tube too.