What is the purpose?
Cheap plinking ammo?
Recoil would be different than other calibers the kit changes the pistol not to shoot.
Seems like it is only cheaper to shoot but if used in any of the other calibers it originally comes in ,it might screw you up as far as being familiar with the higher caliber round you might be depending on for dark thirty , home protection purposes.
I'd say use it for fun at .22 , but burn a few rounds of the other caliber your gun was made for too.
Just to make sure your 2nd chest or whatever shot in the higher cal. does go where it needs to go,not through a wall in your kids room because the recoil or whatever different round put your aim off.
I wonder if since the maker of the conversion kit,being in CA. (30 miles away from me) is trying to make it so people who convert from 9mm or whatever to .22 can keep their pistol if the laws change.
I'd guess conversion kits might be over looked technically by law on a cal. law if the owner said they converted to .22 and had gotten rid of the other cal. stuff.
Basically a come and prove my .22 conversion isn't all I own...
The state,CA,tried to make the sale of ALL 9mm ammo illegal a few years back.
Feds might try it this time.
I don't know.
The feds are trying to sell the new gun laws as what a lot of states already have in place.
I wouldn't be at all supprised if they are only advertising that and will actually make a lot of stuff illegal with add on crap that gets added on too.