[Rotting]

I recently purchased 2 MAG brand 100rd SiG series magazines. Today I recieved my speed loader and tried to load the magazine to the brim, and it struggled trying to force in about 30 rounds. Today I also put in a new inner barrel, and decided to get some test shots going. I made a few shots, all were blanks.

I brought the gun back inside and looked at it to see if it was jammed somehow, and the gun is fine. I took the magazine out, and I didn't even get the typical 1 or 2 rounds that spill out. The magazine doesn't seem to be feeding them, and when I manually pulled back on the part that keeps them in, they didn't end up coming out, and normally they should have just all flown right up into the air, no?

Anyone able to give some advice on what to do? Thanks in advance!