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I can't recall a time that I ever bought replacement followers and springs for pistol magazines and I have been shooting pistols since 1984. If a magazine wears out or starts causing problems I don't bother trying to fix them. I trash them and buy a replacement.
The sand magazine issue is way over blown IMO and stems from the military's archaic need to parkerize everything inside and out even when a manafacture advises them against it. That is why the sand problems popped up with pre-2004 Checkmate mags. Once the finish was changed in post 2004 Checkmate mags there were no more issues but like the old "Beretta's slides will come off and bust your teeth out" nonsense that can still be heard in gun stores and on the internet today, the sand jamming up a magazine issue that happened briefly at the start of OIF still lingers on today on the internet and gun stores.
Those sand channels in the magazine are just over engineering and are completely unneeded. Take your grips off and insert a magazine into the frame of your 92. There is whole lot of empty space. More than enough space for mud, sand, blood, water, etc to move or be pushed out of the way when inserting or removing a magazine. In my opinion if anything those sand groves should be on the inside of the magazine helping prevent the follower from dragging on sand that moves in between the follower and the magazine body. This is what caused a problem with the pre-2004 Checkmate mags.
Glocks have probably one of the tightest tollerances when it comes to the fit of the magazine well and mag body as well as the fit between the follower and magazine body. In addition to that polymer catches and will hold sand. Especially as the polymer expands and contracts with heat. With all the cool guys all over the world carrying Glocks why isn't Glock producing a sand resistant magazine for the Glock?
Just my thoughts and opinions on the matter. For me I would rather have the extra capacity over some feel good grooves.
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I’ve always preferred to own things I can maintain rather than replace. I’ve lived through two magazine bans and countless threats for more. The ability to rebuild a magazine may never matter or it may be worth its weight in gold. Just because we’re currently living in “the good times” doesn’t mean things won’t change in the future.
As far as the box geometry goes, I don’t think you understand how this all works. The sand grooves, or at least the effects of them, ARE on the inside of the mag. Pressing a groove into the sides of the mag creates what is, in effect, a rail on the inside. The bullets column rides against the rail instead of flat against the inside wall of the magazine. Doing so creates space for debris to flow down past the cartridges instead of jamming them up as they rise during cycling. It has nothing to do with inserting the magazine into the pistol.
The sand resistant magazine was developed at the request of the Marine Corp because of beach sand, not because of bad Checkmate magazines (although I’m sure those stories helped make the case for a better magazine). The first several thousand magazines delivered to the Marines during final testing were blued. They asked if anything could be done about rusting and Beretta added the PVD coating. The blued mags were dumped on the civilian market and were sold by Sportsman Guide and CTD (I think). They had all of the features of the sand resistant mags, and were sold as such, except for the PVD coating.
The Checkmate mag problem was more than just Parkerizing, there was a spring issue as well. Glock magazines, like all magazines, will jam up if they get too dirty. People understand this and do maintenance to deal with it. The problem with the Checkmates was that maintenance didn’t help. You could maintain the daylights out of them and still sucked.
Mec-Gar makes a fine magazine. If the increased capacity of them is of value to you then they are a great choice.