Flashman, I run the shorter MDT steel mags in all the rifles here that take them.
They are single-feed double-stack, unlike other brands that are single stack and too long-for-capacity. In fact they are way better than the Brit-made AI original mags and shorter and more developed, and 1/3rd the price.
There are two versions of steel, one with a binder plate and one without.
The "binder plate" a thin strip of steel in the front of the mag that spot welds the join together. This is normal in all AICS steel mags.
They make one without a binder plate, where the join is laser welded and this allows you to seat your projectiles out to just miss the rifle's rifling, if that's your thing.
This is only good with reloads and match ammo where you are playing with projectile jump. Which I find, can make a huge difference.
This is the main reason that I will not or ever buy a brand of rifle that is designed and comes with a cheapie moulded plastic magazine where it's cramped and I cannot play with projectile seating depth.

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The plastic ones have thicker walls, because plastic is not as strong as thin HT steel, and so need to be quite longer for their capacity. I do not like the plastic single-stack 10-shotters that are as long as the 20-shot double-stack P-Mags in another rifle we use. Can't stand them.
I did try them, but quite quickly, the magazine catch tabs moulded into them wore down, and when I'd fire a shot the mag would drop out. F*ck that.
I bought a few when they were on special for under $30 and was that a waste of money.
Yes, they are cheaper and if you don't use them much, maybe they'll perform well for you. For us, they fail.