Bought aluminum and steel mags. Both fit perfectly. No problems with round feed. Would purchase again. MagShack shipped quickly.

Great and fast service, will order again in future

Overall fit and finish is good has a nice shine on it. Took apart to see the internals has a light grey anti tilt follower and stainless spring. FYI says made in Korea on the bottom floor plate. Functions good inserting and releasing in my ar 15. Side note has bolt hold open on empty magazine true test would be to shoot to see if it stands have not used yet. Not bad for the price especially if you prefer steel over aluminum and polymer.

I've not had a chance to use them.
But they are well made. Made out of metal well built

I went to the steel magazines because I had experienced problems with the polymer/plastic one. The steel magazines fixed that problem at a reasonable price..