The Original CZ Forum
GENERAL => CZ Gunsmithing => Topic started by: z0mbi3 on May 20, 2022, 08:47:29 PM
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Hello everyone!
I request your input. I would like to try a grip-chop on a P-07. The aim would be to utilize a P-10S 12-round magazine.
Please keep this thread on-topic by commenting on the technical aspect of the grip reduction. If you want to comment on whether or not it’s a good idea, you’re more than invited! However, there’s already a thread for that in the following link.
https://czfirearms.us/index.php?topic=118551.0 (https://czfirearms.us/index.php?topic=118551.0)
Now, what would be the best way to do this? I have two theories myself!
Theory No. 1: Just cut the difference on all related pieces.
Measure the mag height difference between the P-10C/P-07 mag and the P-10S mag. For example, 0.6" ( I don't know yet because I haven't bought a P-10S mag yet) cut the frame, hammer spring, and hammer strut by .6". Leave the hammer spring plug untouched.
The benefit of this is a very standardized process. Everything is known in length. I understand the life of the hammer spring is reduced as soon as you start shortening it. Therefore that would be the drawback.
Theory No. 2: When reducing, remove as much hammer plug material as possible
When chopping the grip, try to save as much of the hammer spring as possible while reducing the amount of space the plug takes up. This theory will require taking three measurements:
P-07 standard uncompressed spring length
P-07 standard compressed spring length
Modified compressed spring room available
I would use these three values and some math to find out the value of the 4th measurement, which would be the modified uncompressed length. Once found, I would then cut the hammer spring to that value. In theory, this second process will keep the same compression ratio before the grip-chop while still retaining as much hammer spring as possible. Therefore, the longer hammer spring should also keep a longer life than the first theory. But this is not a standardized process and opens the window for more possibilities of error. And this would take some work to standardize.
Maybe you have a much better idea than these two listed above? Maybe I'm just making this way too complicated?
I'm just a dude who works on airplanes, so I don't have a solid background in working firearms. I know there's more to springs, spring physics and that all things aren't equal when cutting a spring. But again, I'd like your input.
Thank you for your time!
z0mbi3