Chip McCormick Railed Power Mags

Chip McCormick of CMC Mags has been designing 1911 pistol magazines for decades. His latest development of the 1911 magazine is pretty interesting. What makes these mags different is the design of the feed lips. As you can see in the images, the metal in feed lip area is folded inward making it a stronger construction. The magazines with this folded feed lips are called Railed Power Mags (RPM).

CMC Mags claims that these new feed lips are at least twice as strong as the conventional ones and these magazines will have twice the service life of ordinary ones. The new feed lip design should let avoid or minimize malfunctions associated with bent or warped feed lips. Another advantage is that having a round folded edge instead of a cut edge makes feeding from the magazine smoother.

The RPM mags are made of laser-welded stainless steel tubes and come with CMC Tactical RPM followers. These new McCormick magazines are available either in 8 or 10 round capacity. Both versions are only available for the .45 ACP cartridge. The magazines are listed on the manufacturer’s website at MSRP of $36.95 for the 8 round magazine and $39.95 for the RPM magazine with 10 round capacity.

If you have been involved in a design of any new product, you will probably agree with me that the hardest thing is to come with the simplest solution. These folded feed lips look so simple yet nobody made it before. I won’t be surprised if behind this simple design there are hours and hours of prototyping and testing.

Hrachya H

Being a lifelong firearms enthusiast, Hrachya always enjoys studying design, technology and history of guns and ammunition. His knowledge of Russian allows him to translate and make Russian/Soviet/Combloc small arms related information available for the English speaking audience.
Should you need to contact him, feel free to shoot him a message at


  • retfed

    So, let me get this straight: The Best Pistol Ever Made has been limping along with defective magazines for 106 years, and nobody has fixed the problem till now?
    That Taft-era technology is really cutting edge.

    • Marc

      Kind of what I was thinking. I don’t recall hearing a lot of buzz about magazine failures in 1911’s.

    • Sunshine_Shooter

      “…twice the service life of ordinary ones.”

      Magazines are consumable wear items. They wear out and need replacing. These will need replacing too, just less often. Would you have the same snarky, dismissive attitude if someone introduced tires that last twice as long for the same MSRP as your current tires?

    • raz-0

      Oh there are efgfective mags.

      CMC power mags work reasonably well, but their main weakness is they are stainless and that stainless is a bit squishy. I used them for a few years competing, and they were fine as long as every thousand rounds or so I’d make sure the feed lips were still in the right place. But given that I could pick them up for about $10 a pop vs. $20-40 a pop for ones that worked better longer, I dealt with them.

      It’s less that they fixed the 1911 magazine design, and more that they fixed a shortcoming of their magazines. But it doesn’t pay to advertise like that.

      And I’m giving them the benefit of the doubt on fixed. The cartridges seem to be sitting a tad low, which can be nearly as problematic as the lips opening up and them being too high. Nosedives vs. stovepiping complete cartridges is a tomato/tomahto type situation.

  • Stuki Moi

    Oh Man! I thought the mags had pic rails, to make them more tactical….These are boring 🙂

    • retfed

      And they’re not even Flat Dark Earth! What a rip!

      • Jared Vynn

        It also isn’t 10mm.

        • Ryfyle

          I want 10mm Mag with contant force springs.

  • Jared Vynn

    At that price point I would rather stick to Ruger magazines, I lose out on two rounds but I have yet to have any issues with any brand 1911 with my Ruger Magazines. Every chip mag I have had needed tweaking to the lips or follower to work reliably, but this has just been my personal experiences.

    • Rodney Jenkins

      Shooting what make and model 1911?

      • Jared Vynn

        SR1911 government, Kimber custom II government, Sig railed government, RIA GI government, Springfield government and officer, and a Colt gi government.

        I haven’t tried them in a commander frame yet.

    • Bruce

      I run 8 round Mecgar mags. I’m not a high volume shooter with 1911s so perhaps I’m just not wearing them out. Anyway, as long as they work I’ll continue to be happy not spending an extra 10 bucks a mag.

      • Jared Vynn

        Mecgar is another brand I have had good luck with, but mostly with double stacks I don’t have any single stack magazines​ from them.

  • TVOrZ6dw

    Chip Mccormick power mags in both 8 and 10 round configurations have been working flawlessly in my 1911 for years. I’m a fan of CMC mags and will pick a few of these up.

  • Dougscamo

    Wish Remington or someone would do this with 742/7400 mag….the biggest piece of crap magazine ever made…

  • Gregory

    I fail to see how the lips will not spread apart just like any other magazine’s. The body will still flex and bend below the top fold of the metal. The lips will be stiffer from front to back but that still will not do anything to prevent spreading which is the problem.