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if you want to do what buddy is doing in that you tube video.
then 2 of our Mossberg 590a1 front sling plates togeather will work, this works better then a spacer as they have the ballbearing dedent an will lock the mag cap into place.
buddys idea will work, but its just a matter of time before it fails.
On another note
if you are trying to put a bayonet onto the 18.5 inch 590a1, that's not going to happen, even with a custom mag tube, the barrel is to short.
bbb