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Easy to install the balance of weight and physical extension make them a great addition to the magazines. Just make sure you don't let the plunger and pin fly across the room during installation process.
These maybe considered a requirement if you have added oversized grips to your Ruger Mark IV/III made of metal that helps eject magazine when wanted. Once installed the magazines feel solid and as if they were OEM. A bit tricky to install but once you've done 1 or 2 you'll get a feeling for how to do it without sending the spring across the room. Never try to install theses without wearing eye protection. Once installed you can forget about them, they will just work and work well. I've used a different product made of plastic and they are much trickier to get locked in place. Find one of several YouTube videos on how to install them.
I use these exclusively in all of my High Standard pistols. I seldom have a misfire that isn't the fault of the pistol. High Velocity ammunition should never be used in any of theses pistols and the CCI Subsonic are extremely reliable.
Installed on 2 completely different types of pistols, 1 HK P30L the other Ruger Mark IV Competition. After a lot of zeroing in (MY Fault not the Products) these work exactly as expected. I used a mounting plate on both pistols I'm thinking about having the HK slide milled for the RDO, but at this point I don't think it's necessary.