I would definitely not recommend these magazines.
They rattle cause the inner and outer case doesn’t match with the pins 100%.
Which isn’t really that big of a deal, cause this can be fixed with some foam and new pins.
But the biggest issue is that the holes on both inner case and outer case doesn’t align like Systemas magazines.
So they doesn’t feed properly (not at all) and they won’t activate the bolt stop. Which means the PTW just keeps firing air…
I tried by swapping inner and outer cases with Systema:
“Blackcat (inner) & Systema (outer)”
“Systema (inner) & Blackcat (outer)”
But since the holes for the pins on Blackcat Airsofts magazines are misaligned compared to MAG, Systema etc. no combo works.
I’ve tried them on 4 different PTWs and the results stay the same.
THEY DON’T WORK
So if you want magazines that actually do what they are supposed to do, just order MAG or Systema.