Can be adjusted to work, but not worth the effort - Pro Mag Ruger Mini-14 .223 Rifle Magazine

First I have to agree with Joe that they insert more easily than my OEM mags. The latch "block" is folded metal like the Ruger 5-round style rather than the welded on block like the Ruger 10-round.

The thing with these rifles is that they're very sensitive to how high the top round in the mag is. Too low and the bolt slides over the top. That's obvious. Too high and it pushes up on the bolt as it's trying to eject and can cause ejection problems. (The bolt has some slop in it to allow for it to work dirty, and if it's being pushed up and to the right, like when it's extracting the second casing, the ejector tab can barely scrape the edge of the empty casing rather than knock it loose from the extractor claw)

These can be adjusted by bending the top tabs with pliers to get it right, but you're wasting ammo and range time until you get it right. Maybe you could get it set by manually cycling dummy rounds, but you can't really simulate the way the bolt gets violently thrown around.

The nickel ones do look classy on a stainless rifle though.