Compare locking area on the barrels.
With some movement in the .22 barrel and not the .410, then it is like the locking catch area of the barrels are different, though miniscule.
"A well regulated Militia, being necessary to the security of a free State, the right of the people to keep and bear Arms, shall not be infringed."
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Former President of the ECPT (Eifel Combat Pistol Team)