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His solution was to space the magazine cap with a rather large lock washer - something I don't think is the wisest idea, since there will be less threads engaged holding the barrel on.
What I would do given this scenario, is modify the bayonet to suit the gun - not the gun to suit the bayonet.
Take that same lock-washer and bayonet down to your local machine shop, and pay a few dollars to have them weld it onto the back of the barrel hole.
I just bought my 590 a - boc - bayonet, its fit was very sloppy. I rectified this by taking my dremel tool with a small grinding stone, I ground out the factory peanning.I then filed the shoulder cuts down a little over an eighth ,tacked it and cleaned up said tack. Repainted butt cap with flat black touch up paint..... ta da perfect fit.
The sweetheart looks at me like I'm crazy because because ups just droped it on the porch...... Crazy Cool .... my Mossy is shaping up