I'm also looking for mags for p10c for CO, but I'm worried about maybe over inserting a p09 mag. Are there any extensions for p10c/p07 length mags to get to 140?
(I understand with their custom 10 coil kit or the Grams 11 coil 23 rounds of 9mm should be expected in a 140mm mag)
1)
I've seen CZC has +4 extension, but I'm not sure what overall length that is (probably significantly short) SKU: 10237
They have +1 extension for the p09 mag which fills the space up to the p10c grip, but again no length specified. SKU: 1001100
They have the 140 length p09 extension but don't say how many + rounds it gives (as some kind of rough comparison to the above)
Then there are +5 extensions from places like Shield Arms and True Precision (but again no length listed) https://shieldarms.com/cz-p10-c-magazine-extension
I own 2 p10c mags, so I'd like to at least use them instead of buying complete p09 mags.
Maybe the best option is to grab a Springer + Grams pack for my p09 mag, start the match with it in the gun for 23+1, then have my p10c mags with the +5s so 21ish with follower?
2)
What follower does better between the Grams 11 coil and follower kit vs the CZC 10 coil and follower?
I've heard the CZC doesn't lock back but heard nothing either way about the Grams kit.
As an aside, I believe the p09 mag with the factory +2 extension is over the allowed length for CO because of its shape.
