New Redball .45 acp mag won't seat.

I purchased 2- 20 round redball mags to go with my new 4595 TS.
I loaded them and took to the range. One seated and had a couple of issues loading,
new gun, new mag no great concern, but the second mag wouldn't seat in the gun. The mag release button would act like it would push out and seat but not quite.

Before I contact the manufacturer, I thought I'd throw this out there and see if anyone knows any quick fixes.

 

On the first trip to the range, it was fully loaded. `I thought it was seated dropped bolt it loaded pulled trigger second round jammed and mag fell out a little. It would not seat not matter how hard I hit it. So it would've had 18 rounds. Since then I've tried open bolt, mag empty and mag 7 rounds won't seat. Have tried closed bolt mag empty and mag 7 rounds no go. Smacked hard enough. So wondering is the notch on the side of the mag could be an issue.

 

No that I can see by eye, but when you shove it in you feel the mag release button start to catch it, but it just doesn't quite get there. The first mag runs flawlessly. Might be send back to Red Ball time.

 

I figure it's got to be something stupid like the notch not quite right. But 2 range sessions, 200 rounds, I love this carbine and .45 is my sidearm, so ammo is a snap. Wanted a Thompson 1927 m1a1 but for a cool grand less, this will do just fine.

 

Ok, here they are, probably too many but here ya go.
Thanks in advance.

 

I thought I named them. The first 2 are the bad mag, the second 2 are the functioning mags. The last 3 are side by side.

 

I took your advice, here was my final sight picture.

 

Thanks for advice. 40 minutes of scrape, scrape, scrape, check fit..scrape etc... later (about 1/16") it was seating with very little force. Took it the range today, ran a full mag with no hiccups.
Took another pic I thought I'd post that shows the stamping was too low from the factory on the one on the right.
Maybe it can help someone else.