I was dry firing my beretta px4 storm and my sig sauer p229, both .40 cal and I noticed my px 4 has something i would describe as a 2 stage hammer cock, that my sig doesn't. as you first start pulling the hammer back it clicks and its partially cocked but not all the way back, then I can cock the hammer all the back...what is the purposes of that feature? I tried looking it up but no info. I could find on it...

Many SA/DA pistols have this feature. It is a half cock position. It makes the double action pull a little easier and shorter. It works well on guns with firing pin safetys because dropping the hammer won't fire the round. I have it on my CZ P01.

It is called a hammer drop safety.

 

It is a double safety. If the hammer somehow acidently falls, this will stop the hammer about a 2/3rds the way down. If somehow the hammer were to fall all the way down, then the firing pin safety will protect it from accidental discharge.

 

It is not intended as a half cock position, and should not be carried in this position. If it were in this position and you dropped your gun you could potentially damage the sear. It is discussed in your PX4 storm owners manual.

oh ok thats good to know, i just thought it was a little wierd, thats all to "COCK IT" like that... hehe...

Perhaps they are different than my CZ then. Lightly pulling the trigger puts it in the half cocked position. So does using the decocker.

If i have given bad info, i am sorry about that.

Different guns, different functions. On the CZ platform, the half cocked state is there for hammer down carry. The manual states that a manual decock should be done to the half cock notch and the decocker CZ pistols also drop to this state.