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On a full size 9in PTR9C, extended is 27 1/4, collapsed is 24 1/4.
This Spuhr Stock Assembly will be compatible with the ZF-5P.
Always find out for yourself by learning your states firearm laws and or contacting the ATF. If your PTR9 is the compliant version without a threaded barrel and a 16.2 length, it will bump your firearm into the assault category of two or more features, (pistol grip and telescoping stock). Read bellow....................................................................................................................................... Generally, a semiautomatic, centerfire rifle with a detachable magazine that has two or more features—such as a folding/telescoping stock, pistol grip, or threaded barrel—is restricted, with exceptions for items owned before August 1st, 2024.
No, the compatible version can be found here: https://www.opticsplanet.com/spuhr-stock-assembly-for-g3-mp5-hk33-53.html