AGM Scar L mag problem

[Barty88]

I have a agm scar l aeg rifle and I used it fine the other weekend for a full day of skirmish.

 

Just got it out to prep for next game day and the problem seems to be that the mag catch isn't closing on a couple of mags (all of which are the same brand dytac 300 round m4 mags), the problem is they won't keep the mags in place and I am hoping it is a quick fix, I tried tapping them in with a tad bit of force, but to no avail.

 

Any help would be much obliged.

[Russe11]

So it's just certain mags? Do the catches at the top of the mags move okay (the little slidey bit that holds bb's in)? if not then you may need to lube this.