I obviously bought this for my ECHO 1 DSR and they are some pretty good magazines. The sides and the bottom are metal, however the trap door and the internal mechanisms are plastic. Considering these pieces are on the inside, they don't need to be metal. the trap door is pretty big. its about 1 inch long so its really easy to pour BBs into it from a bag. the wheel at the bottom of the clip is turned toward the stock. i kinda like it that way but thats my preference. using these clips for a while i have only had a few double feeds but its dosent happen often enough to be a con. one thing that is not mentioned in the description is that every one of these clips comes with a key. the key pokes in a hole on the right side of the clip and is used to turn the wheel without hurting your finger on the wheel teeth. it also winds up the clip faster so you can use it before you go out on to the battle field. overall its the best clip for a gun ive ever seen.
Metal outer construction
500 rounds(which is more than most other mags)
key to wind wheel quickly and easily
big trap door that stays closed well
looks cool in and out of the gun
made by ECHO 1
Rating: [5 of 5 Stars!]