PROMAG MAG SIG P320 9MM COMPACT 15RD BLUED STEEL - 9mm Caliber, Aftermarket Origin

My first Bud's order. The exterior of the mags looks just like Sig Mags except hole placement on the front of the magazine, the holes on the side look like they are in the same position except for no round indicator number. The holes do not indicate how many rounds are in the magazine. The difference is on the inside the spring is not connected to the follower or the bottom plate. When loading at certain points bullets rattle then stop when the next round is loaded. Took 20 minutes to load two magazines; only took me about 45 seconds to load my Sig Mags. I bought these mainly for the range use. I would not use these magazines for defensive loaded out until range tested. They are not ready to go out of the box. The best thing about the magazines is the price, four magazines for less than two Sig Mags. I will updated after use.