Look at the front of the mag. You'll see 2 divots that are spot welds. Most people will tell you to drill them out to release the inner plate, then weld the remaining holes shut, and cerakote the mag to make it look good again.
It works a f* of a lot better to come from the inside with a die grinder or Dremel tool and grind the plate and weld away, leaving the mag body intact. You don't have to weld a hole shut if you don't make one in the first place.