"I recently purchased this gun a couple of months ago and was surprised at the performance and durability of this gun. I'm not going to lie, it was a little weird to get used to at first because I have dealt mostly with M4's. In this gun, most of the weight lies at the back of the gun. After using it a bit, it felt very natural and was very easy to carry and move around with. This gun has great accuracy and range for such a compact gun and this is because of its bullpup design. The barrel is longer than most M4's and as long as some M16's, but the gun is still compact enough for close quarters. The ROF and FPS are good and the gun takes M4 and M16 mags. I have yet to have any complaints on the polymer body of this gun because it is made out of a very strong and sturdy material. Some people have complained about the seams running down the center of the gun but to see it in person, these seams aren't hardly noticeable at all. The only complaints I have on this gun are the flip up sights. The sights do what they are supposed to do but the rear one occasionally flips down. It has never been a major problem as it only happens about once or twice in a day's worth of using it. other than that, the gun shoots, sounds, and feels great and is well worth the price you pay for it."