Things I liked:This gun is very well made. It has a lot of power and great fps. It's balance is excellent and it is not overly heavy. The bolt is smooth and the gun is easy to operate. It is very accurate with .25 gram bb's. I can hit someone through a 1 inch gap in a fence at 15 yards with it. It is made out of durable materials and it is very reliable. The rail is very good to have and gives you many options when choosing a sight for it. Things I would have changed:I wish this gun would have come with a better manual because I had to guess my way through the assembley. What directions it did give were poorly written in places. Also, in temperatures under about 15 degrees the hop up can have a negative effect on the guns performance. If the barrel is kept clean and the gun is operated in temperatures above 15 degrees it will work the best. What others should know:I mounted a BSA 42 mm red dot sight on this gun which works very well for long to medium range precision shots. I like it a lot because it gives me a wide field of view and it is easy to find targets. For airsoft, it is better than a scope because it makes it easier to shoot quickly. Also, .25 gram bb's work the best in this gun and they can be found at any sporting goods store.