If you have the Umarex H&K MP7, you gotta get spare mags! And these are by far the best quality gas gun mags I have come across. Extremely durable and well built, these are made to last! When fully charged with gas, they can easily last close to 2 mag fulls of ammo! Some minor issues with the seals and retaining gas, but nothing a quick purchase of spare seals can't fix. Fantastic buy, 4 outa 5!
Very durable quality, all metal
Satisfying "clack" when loaded into gun
Great heft and weight to them
Amazing gas capacity
Some minor issues with bad seals
Weight MAY be an issue to others
Rating: [4 of 5 Stars!]