Nice pistols IMO. I had Model A, B, B Super, P(45acp), , CO (25acp), I (32acp),,probably some others I can't recall. As well as numerous .22rf models like the F, F-Sport, F-Target & Lancer .
I did have a PD,,but it had been modified by someone trying to shorten it's already short length frame and they ruined the thing. I bought it for parts and that's what it ended being. A shame really what someone had done to that pistol.
Never had a Model B/M. Shoulda bought one,,hind sight being what it is.
Yes they're heavy, they're all steel. The frames fit the hand nicely for most people.
They do not have an inertia firing pin. Neither do the A,B or Super models.
When the hammer is down,,it is down hard on the firing pin and the tip is extended from the breech face,,,or if a cartridge is chambered,the firing pin tip is resting hard on the primer.
A bad situation and ready for a discharge should the hammer be bumped/gun dropped.
Carry chamber empty.
Or carry loaded w/hammer cocked and thumb safety engaged.