|
If you must..........
The original military development of the Remington 870 used the front of the factory magazine extension as a bayonet mount.
The latch part was welded to the underside of the factory extension clamp.
This is why the factory extension tube has a groove in it.
The barrel clamp screw interlocks with the groove and prevents the clamp, from shifting on the barrel under recoil.
It also, positions the bayonet latch and prevents the clamp and latch from shifting.
All you'd need to do is buy a gun with a 20" barrel and a factory magazine extension kit.
The 20" extension is the only one that positions the groove and clamp in the right place for the bayonet, so you can't use an 18" barreled gun.
All you'd have to do is make a latch lug or cut a latch lug off an M14 flash hider or M16 front sight base, depending on which bayonet you want to use the M6 or M 7, and weld it to the bottom of the factory clamp.
Note that this was found to be a rather weak setup, and it's easy to tear up the clamp and/or the extension tube if the bayonet is actually used.
This is why the military designed and built the special shroud/extension unit with the bayonet mount.
There is a man on the AR15 forum that has seriously discussed making an updated Marine type extension with the bayonet latch, and went so far as to design one, but I've heard nothing more about it for a month or so.
So, if you have a 20" 870 and a factory extension, the easiest method is to weld an M14 or M16 latch to the bottom of a factory extension clamp.
|