Originally Posted by
williejc
About the mag extension. Correct reassembly requires a specific sequence when reinstalling the two parts. Perhaps one of our l.e. armorers will provide the right info. Years ago I had the factory extension on an 870, loaded it, and months later I checked the ammo. Two had compressed enough that a ring formed above the rim area that prevented feeding and chambering. Ammo was Win. l.e., which in this example was defective. Mag spring pressure distorted the shells.
1187s are heavier than 1100s. With a fully loaded extended mag, you may find the balance to be unwieldly. In your rig if feeding problems occur, check the extended mag, which I consider to be a weak link. All won't agree here.
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