There was an extensive discussion of the ACT-MAG Cz75 Magazines here:
https://czfirearms.us/index.php?topic=105603.msg823004#msg823004In that discussion, I had tested the ACT-MAG Cz75 Magazines in various Pistols:
I finally made it to the Range to test out these Magazines. There is roadwork on the way to getting there, so access has been iffy.
Reliability Testing consisted of full Magazine (17 rounds) plus one in the Chamber to start, as sometimes the top round in a full Magazine can drag on the bottom of the Slide.
Testing went very well with no feeding issues in the Pistols listed below:
Tanfoglio TA90B Series 88
TriStar T120
Tanfoglio/RIA MAP1 FS
Tanfoglio/RIA MAP1 MS
SAR B6P
The RIA/Act-Mag Cz75 Magazines were also used in the above listed Pistols for some informal Target and Fun Shooting with no feeding issues.
Not tested was the SAR K2P, as the aforementioned Slide incompatibility issue could not be resolved and therefore, use with the SAR K2P is not recommended.
Instead , use the SAR K2P with the Mec-Gar Cz75B 17 round Magazines.
Also note that the 17 round Mec-Gar Magazine supplied with the TriStar T120 was tested with the other Pistols listed and performed flawlessly.
That TriStar/Mec-Gar Magazine also appeared to be a twin to the Mec-Gar Cz75B 17 round Magazine, right down to the Blue Follower.
Did not know that E-Lander was still making Cz75 Magazines, as I've not seen any for sale, as of late. The E-Lander Magazines do have a good reputation and I had some with my late Pre-B Cz75, the latter which was sold off to a Collector along with the E-Lander Magazines.
In further casual use of the ACT-MAG Cz75 Magazines, I've not had any issues with them. I do know, that for my own defensive use, I've always carried with the Mec-Gar Magazines, but that may be because they work with my SAR K2P or that the capacity of the 19 round Cz75B Mec-Gar Magazines are called for. When shooting USPSA/IPSC Matches, I always use the Mec-Gar 19 rounders.
If I needed Magazines and could not get the Mec-Gars, the ACT-MAG 17 round magazines are not a bad way to go. For a typical steel small frame Tanfoglio Pistol, they do work.