Things I liked: I like the manly size of this gun and its replication of the real steel. It is heavy and feels real with kick back. You will want some extended mags if you plan on using the full auto which is nice. My son is a sniper and uses it for close engagement. He has been getting more hits with this than the sniper rifle.
Things I would have changed: I would keep more in stock. I would stock extra magazines (regular and extended). I would make sure that Co2 mags and gas mags can be used. Co2 for outdoors and 134a in gas mags for indoor courses that are restricted to 300fps.
What others should know: Extra magazines are hard to find. Had to order mine from overseas. Gas magazines fit this gun but I am not sure if it would mess the gun up. Would be nice to know.