Difference between a Cz 75 Pre B and a CZ 75B recoil spring

[JROC]

Okay I recently bought a CZ 75 from Wideners. It's a surplus gun, as they sent me a 1993 model, and it's one of those CZ75's where it's almost a CZ 75B, but the slide still has 9 PARA stamped on it, there is no firing pin block, and the slide stop and safety are Pre B. Other than that it seems to be just like a B model. The frame is a B models frame, and houses there squarer B model magazines just fine, the slide looks like a 75B's slide other than there is no firing pin block or hole in the serrations for the pin, the sights are 75B dovetail sights.

The thing is when I order the gun it looked to be advertise as a 100% Pre B gun so I order a few mods for it, and one of them was a Wolff 16lb recoil spring. Wolff offers both Pre B and B model springs and naturally I took the Pre-B spring.

What's the difference between the Pre-B, and B model recoil springs? Is it actually putting more than a 16lb spring weight in the gun?

The one they sent me is quite a bit longer than the factory one, and racking the slide feels quite a bit heaver than what most gun with 16lb recoil springs feel like. It almost feels as stiff as the 22lb Wolff spring I added to my Glock 20's.(not quite but it's stiff) It also bows real bad, but it seems to rack just fine it's just stiff for the weight of the spring. It's been in the gun for a couple of weeks and has kind of loosened up some. I haven't fired the gun yet, but it seems like a little more than you need for a 9mm. It may do good for some of the +p+ ammo I have.

Here are some crappy pics to show what I'm talking about.

 

[railroader]

Factory recoil springs are 14lbs. You can cut a couple of coils off of the 16lb. spring. Mark

 

[Pilot]

I have a 1996 75B, and bought a factory standard Wolff spring for it. I think they are 14lbs. However, they indicate they are designed primarily for the Tangfolio/EAA guns, and I've read some discussions there are differences. Mine also seems a bit too long, and bends just like yours, but it works fine. I had a stronger than factory Wolff spring previously which I did not like, so I went back to factory strength, but again, with a Wolff spring not a CZ factory spring. You may want to try a recoil spring from CZ USA instead as a test.

 

[txgunsuscg]

I bought a "factory" CZ extra-power spring for the 75 (the CZ website only has a 75 spring, not a B and pre-B) and it was way too long and bound up in the gun. I have a Wolff pre-B spring coming (standard 14 lb.), I'll see if I have the same problem.

 

[JROC]

Good advice guys. I'm going to go shoot it here in a little while and see how it works. I have regular 9mm, +p, and some +p+ rounds, and I think I'm going to see how it handles all of them.

 

[txgunsuscg]

I just received my springs after that last post. The 14 lb spring is still longer than the one in the gun, but not near as bad as the 16 lb one. I attribute this to the spring in the gun maybe taking a "set". Once I get a chance to shoot it, I'll report back.

 

[JROC]

Okay I went and put about 125 grounds or so of several different types of ammo through it today and I have to say that the 16lb recoil spring really makes the gun one smooth shooter. I was putting everything from cheap range ammo, to +p, to +p+ through it and it was shooting very well. My dad came over while I was shooting it, and he shot it some, and he was very impressed with how nice a shooting gun it is. Very smooth and manages the recoil of the higher power ammo very well.