CZ-75 Vs CZ-75B

[steveracer]

Hammer down, intertial firing pin.

You can't get it to fire that way. Slam the hammer with a mallet on a loaded chamber, hammer down.You aren't going to make the hammer hit the firing pin fast enough to force the inertial firing pin forward into the primer. Just not going to happen. It requires a full force hammer strike to ignite primers. Hammer down, the hammer is resting on the firing pin, but it's not able to make it touch the primer.
You guys need to look at your guns closely. A CZ-75B or Pre-B model doesn't have a firing pin long enough to contact the hammer and firing pin at the same time. It's designed to be struck by the hammer and travel forward into the primer, but only when the spring is overcome by the inertia of the strike. The hammer resting on the pin can't make the gun fire unless it is struck with enough force to move the pin past the breech face and into the primer. Have you played croquet? You use a big mallet to strike a big ball which is touching another big ball. Now, add a spring and a very low mass firing pin to this mix. Not going to move far, and not with much force.
Hammer down is totally safe. Cocked and locked is totally safe. The only problem I can think of is Half-cock, which is potentially more dangerous, because the hammer spring might be just strong enough to ignite the primer if the sear trips. The safety isn't engaged in half-cock, so the danger increases, slightly.

 

[atblis]

I wonder too

I'll check my older manuals to see what they say (not that that means much).

Your saying a gun could fire from the half cock, but not if dropped on its hammer on a concrete surface?
Let's align the planets and stars here
Longish firing pin
Short/Weak firing pin spring (broken even perhaps).
Soft primers
Really tall person (longer fall)
etc. etc.

 

[Stephen A. Camp]

Hello. I checked the firing pins on four CZ-75's. All of them were inertial.

Best.

 

[steveracer]

Measure your firing pin.

Now measure the firing pin channel. The pin IS NOT LONG ENOUGH to touch the hammer and primer simultaneously. Why is this even in question?

 

[Stephen A. Camp]

I agree with you. It was my intention to convey that but I failed to do so as I believed that "inertial" by definition implied a firing pin shorter than its channel, but did not clarify this. One can also check this on most any pistol by simply putting a flat edge against the rear of the firing pin. If the tip does not protrude past the breech face, it is safe to carry with the hammer down insofar as smacking the rear of the hammer will not cause the primer to be smacked. Several years ago, I satisfied myself on this by smacking a lowered hammer that was going to be replaced with a mallet. A primed case was in the chamber of the Colt 1911 pattern pistol. Several smacks against the spur of the lowered hammer in a row resulted in not even the least dent in the primer.

The "danger" is if the gun falls far enough and lands on a hard surface exactly on the muzzle. The gun stops but the firing pin moves foward and strikes the primer.

Most of my semiautos are w/o the internal firing pin lock which causes no worries on my part.

Best.