-Small compact that it doesn't interfere with aiming down
-3,000 round capacity
-Takes a 9V (easy to find replacement batteries for it anywhere)
-Plastic gears; easier to strip
-Pressure switch connector broke off easily. Needed to be re-soldered together
-Winding is a bit on the loud side
Conclusion: For the price, it does it's job, WHEN it works. It feeds fine since it auto winds with the pressure switch. But the quality on this thing adds to the headaches you may encounter while during a match. I would honestly spend the extra money for a more durable solution to a drum mag. These problems are easy to fix with either super glue, hot glue, and solder, but the stripped gears are nearly impossible to fix and would require you to get new gears.
Rating: [3 of 5 Stars!]