Hi,
I have a Puma 357mag 24" and I would rather have a recessed keyed lock so I can set the block when stored but have it off when not. The machining on the safety causes mine to be about 1/16" above the top of the bolt and will catch on anything that moves across the top of it. In trying to bend mine down a little, The little tip broke off and I have stoned it to a round profile. It doesn't catch on things as much.
Paul