OK so I just got a mini 14. It came with a 20 round mag (maybe 2) and I bought 2 factory 30 round mags directly from ruger.
So empty both the 20 round mags and the 30 round mags can be inserted flawlessly.
I just got some 223 remington 55 grain ammo today.
Put 20 into the 20 round mags and...