MAG 100rnd midcap SIG 55x mags

[Fly 9]

I just purchased 2 MAG 100rnd Midcaps for my Sig 552 and have a bit of a feeding problem with them.
When I load them I can only get about 50 or so in with my speedloader before it stops. When i tried releasing them from the mag only one or two come out at a time and the others don't get pushed up.
Anyone have any ideas?

[JTF27]

Spring could be jammed.

[Naglfar]

Silicon oil.
Open them up and lube up the spring.
My MAG M4 midcaps worked good out of the box but flawless after I lubed them up.

[Skladfin]

the same thing happened to me when I used MAG Midcaps. I used the Madbull BBs when I had the problem. I changed to BB Bastard and it worked again.

[Fly 9]

Alright, I got them working just to let people know with the same problem.

It would appear that the "oil, load, unload, repeat" method seems to work. You might also want to take the spring out every few reloads and give that a spray down using your basic silicone spray. I still have a bit of trouble with them not unloading but it's getting much better.
What I did was sat for a bit using this method in front of the tv and then loaded one last go into it, left if for a couple of days, forgot about it, went back before a game and tested them and they worked pretty much flawlessly.

Went to use them for the game and they bunged up on me again.

Anyway, it seems this is the method to use as it's yielded the best results.

Thanks to those who responded, it was of great help.