Bayonets on shotguns are nigh useless.
Zero your shotgun with slugs. Mount a bayonet. Check your zero. Chances are, your shotgun is now not shooting to the sights.
Next, pitchfork a hay bale the way folks use a bayonet. Recheck zero. Note you're not shooting to the same Zipcode.
Shotgun barrels haven't enough metal to maintain zero under those conditions.
Note that while the news footage from the War On Terror shows lots of shotguns, none have bayonets mounted. Now you know why...
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