A several years back I decided to get rid of a Winchester M97 I had. The 30 inch barrel had been tastefully cut down to the "riot model" length, and my intention was to get a repro trench shield/bayonet lug attachment for it. However, I heard about the Mossberg M590A1, and found one at a local shop. I had been told these were overruns made for the government, having the thicker mil-spec barrel, metal trigger guard, and most importantly, a bayonet lug! In any event, I have tried several bayonets on it. The OKC 3s seems to fit, but is tight in fitting/locking the last 1/4 inch. Ran into the same problem with a Phrobis 3-line M9. A US M7 snaps on without a hitch, and so have three Lan-Cay M9s. I suspect the bayonet lug bay be @ maximum spec which has resulted in the interference experienced when attaching some bayonets...
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