Anyone running the CZ P07?

[Bill]

I got my CGW stainless recoil spring rod and 15 and 18lb recoil springs today. I purchased them to try them out with the new comp coming out, thinking that they were lighter than the factory spring. . . But the 15lb spring feels significantly HEAVIER in the gun than the stock spring.

From what I read, the P07's used to come with the blue spring from the factory, and those were way too heavy. Mine has a captured guide rod and black flat wound spring from the factory. Anybody know what that spring is actually supposed to be rated at? Gun is an urban gray with sn # C1888xx.

Also regarding holsters: Can't speak highly enough about the iwb unit from HenryHolsters. Comes with the phlster tuckstrut on it, and is often in stock ready to ship immediately. Fit and finish is superlative.

[Greg]

Something that helps the cam go away is to tweak the trigger bar spring so that it is below the opening for the de-cocker. Smaller rollers also require more trigger travel to drop the hammer and seem to reduce the cam feeling. It gets to a point where it won't drop the hammer if it's undersized though.

THIS - works very well.

[Bill]

UPDATE: On the recoil spring question.

Spoke to Cajun, they still believe the P 07 Oem spring is 20lb (I'm thinking this info dates back to the Duty model)

CZ-USA Customer Service says the current OEM captured recoil spring is 13LBS! Which explains why it felt lighter than the 15lb cajun spring. Still slightly confused about the whole thing (as was Cajun when I called them back to pass along the info). How could a 20lb spring even run in the gun if could be replaced by a 13lb spring and still run the gammut of factor and SD loads?

[s0nspark]

CZ-USA Customer Service says the current OEM captured recoil spring is 13LBS! Which explains why it felt lighter than the 15lb cajun spring. Still slightly confused about the whole thing (as was Cajun when I called them back to pass along the info). How could a 20lb spring even run in the gun if could be replaced by a 13lb spring and still run the gammut of factor and SD loads?

Interesting... perhaps they finally are acknowledging that the guns were really over sprung.

BTW, this comes straight from the CGW website - it is helpful in understanding how to choose a recoil spring weight ;-)

https://cajungunworks.com/technical-support/

How to select the proper recoil spring

The recoil spring is one of the most critical springs in a semi-auto pistol, yet most shooters install the wrong spring the vast majority if the time. To understand the recoil springs function, we need to examine what it does and how it works.

The recoil spring performs 5 tasks, all of which are critical for reliable function:

1. Controls the velocity of the slide when cycling
2. Allows the slide to achieve a full rearward stroke
3. Ejects the spent case the correct distance from the ejection port
4. Picks up and feeds the next cartridge
5. Positively locks the slide into battery

Item #1: the optimal slide velocity will eject a spent case, on average, 6 – 8 feet away from the shooters stance. This is the ideal slide velocity for reliable extraction, ejection, and subsequent feeding. Pistols that eject a case 12 feet or more will prematurely break a slide stop, can produce excessive muzzle rise or lift, and can increase felt recoil. The majority of the time folks follow the bad advice given on YouTube videos and on the internet telling folks to use a 10 or 11# recoil spring, which is incorrect unless you are using very light loads.

Item #2: the slide must travel its full stroke so the slide abuts the frame, just as it was designed to do. There is no such thing as “slide or frame battering” and the installation of recoil spring buffers can prevent the slide from achieving its full stoke. Recoil buffers can cause ejection problems by short cycling the slide, plus when the buffer breaks, as they all eventually will do, will drop broken shards into your CZ’s lock work, rendering your pistol inoperative. A full slide stroke allows the spent case rim to contact the ejector with full force, producing a strong, long distance ejection, a critical function for a reliable running pistol. Obviously you can only determine the correct ejection outdoors, so if you only shoot indoors, you must find somewhere to do some testing.

Item #3: there are 2 criteria for determining the correct recoil spring poundage: an ejection distance of 6 – 8 feet, and for competition shooters, how quickly your muzzle gets back on target. To heavy of a recoil spring can cause the muzzle to “dip”. To light of a recoil spring can make the muzzle rise to much and puts added stress on the slide stop pin. So finding the optimal spring can be trial and error. The OEM recoil spring weight in a full size 9mm CZ pistol is 17#’s, this includes the CZ-97 in .45 ACP. The compact 9mm metal framed CZ’s use an 16# recoil spring. The CZ P07 & P09 both use a 20# recoil spring. Each pound change in the recoil spring will change the ejection distance 1.5 – 2.0 feet. EXAMPLE: your out of the box SP-01 with a 16# recoil spring produces an ejection distance of 2.5 – 3.0 feet. To get this distance into the preferred 6 – 8 foot range, you would need to use either a 13# recoil spring (ejection distance would be 8.5 – 9.0 feet) or a 14# recoil spring (ejection distance would be 6.5 – 7.0 feet). Either would work fine.

Item #4: if your CZ has the correct recoil spring to match the pressure of your load, then mis-feeds, jams, and improper feeding are virtually eliminated. With the correct recoil spring installed, the main issue will be reduced to the magazines or the ammo. You DO NOT select the recoil spring based on bullet weight. You select the recoil spring based on the operating pressure of the load. A 115 grain bullet can produce a much higher operating pressure than a 124 or 147 grain bullet, with the powder charge being the determining factor. However, bullet weight can definitely affect operating pressure, if the same powder charge is used. The wrong recoil spring can produce double feeds, stove pipes, and angle jams where the slide has “crashed” into the case, pinching the cartridge. Very light recoil springs can result in failure for the slide to return fully into battery.

Item #5: since all semi-autos are reliant on quality ammo with the proper case crimp, sizing, and proper overall length, to light a recoil spring will allow a marginal cartridge to not fully chamber. However, in this instance, a marginal cartridge would have allowed the round to fully chamber with sufficient recoil spring poundage. It has been proven that to light a recoil spring can cause inconsistent lock-up, which can result in reduced accuracy. Remember, for any semi-auto to be accurate, the barrel must lock-up consistently, shot to shot. The correct recoil spring will ensure a positive lock-up.

As a side note, we get asked all the time, “if I change my recoil spring won’t I need to change my hammer spring”? Absolutely not. There is no relationship between the hammer and recoil spring. Let’s see why:

Some years back an enterprising individual mounted a motion sensor on a 1911 slide. With full power 45 ACP loads the slides total cycle time was 6 thousands of a second. This means the time the slide made actual contact with the hammer was even less. Much less. So in essence, you select your hammer spring for reliable ignition first and foremost, then you tune your recoil spring last to match the pressure of your load.

[Bill]

Oh yeah, I'm aware of the proper way to adjust recoil springs and tune the guns, but my question pertains to users knowing whats in their gun to start with. Critical to tuning is knowing if you want/need to go up or down in spring weight and you need a baseline to do that.

I ordered 18 and 15 springs thinking they were REDUCED power from OEM to tune the gun for use with a comp if need be, but its seems like I may have purchased two springs that are ENHANCED power, which are of no use to me for my purposes. Trying to fill in the gaps so others don't make the same error.

I have a message pending to the CZ armorers to see if they can confirm the factory spec sheet. Customer service at CZ was very polite and professional, but couldn't find any other info in their system to verify the 13lb oem p07 recoil spring spec. Not even in the parts department where replacement units are stocked. Questions also remain as to whether the P07 and 09 use the same springs and why the P09 would be sprung more heavily than its compact brother.

I'll update the thread when I hear back

[s0nspark]

[timotab]

How do you like the comp?

[s0nspark]

How do you like the comp?

Initial impressions are favorable - I have yet to shoot it, though ;-)

I should have a range report up sometime over the next week and I'm planning to put a few different kinds of ammo through it so... I'll let you know

[timotab]

Initial impressions are favorable - I have yet to shoot it, though ;-)

I should have a range report up sometime over the next week and I'm planning to put a few different kinds of ammo through it so... I'll let you know

I'm looking forward to hearing how it does. It looks slick. I've been thinking about getting another P07, have a Gen1 with all the CGW goodies installed except a hammer. Want to try a Gen2....someday I guess.

[backtrail540]

Does it fit in a p09 holster or does it need to be open ended?