A.J. from United States, NV Public Profile

This is more of a +3 than a +5. Try going to +4 and the spring gets tangled / goes limp for the remaining cartridges and you gotta shake it to HOPEFULLY release the tension.

I own several of these for different 9mm magazines and this was the worst experience to add to my P 10-C. Strike says it fits and is compatible, and both are true, but the spring stacks on itself and even gets tangled. Realistically, this ADDS THREE ROUNDS TO THE P 10-C.

This was the ONLY Strike extension that took me longer than five minutes to install, simply for function checks because I stripped the first round and the rest of the rounds became limp since the spring got caught in itself and didn't give tension.

Strike Industries: if you're reading this, I support and love my local Las Vegas NV small businesses. This CZ P-10 C "+5" mag extension was not your best work. The OEM CZ 15-round magazine that I used your product on is now damaged, as I had to pry the follower out after the stuck spring released and shot it out of its original, natural position.

Other reviews state this doesn't load the extra five rounds, but it 100% does when you use the stock / factory spring. DO NOT USE THE LONGER SPRING STRIKE PROVIDES UNLESS YOU ONLY WANT THREE MORE ROUNDS INSTEAD OF FIVE.

Very easy to install & no issues functioning during use.