"I don’t know what Gms88’s problem is. Obviously there’s a difference in material. The M704 (6in barrel) is lighter by half a pound than the Sport 708 (2.5in barrel). You can read the information on products before purchasing them on airsoftmegastore.com. I actually like to know what I’m about to buy. I will mention I didn’t understand why the M704 was so light until I held it in my hands. The frame around the cylinder and THE HAMMER is made out of a light metal alloy of some kind. It’s light like aluminum, but overall, sturdy, and strong. The barrel and the cylinder are made out of a high grade polymer plastic. If you look close enough in the pictures you can tell the texture differences. I owned a WG Sport 708. Before I compare the 708 to the M704 let me make it clear that the M701, M702, and the Sport 708 are all the same gun with different barrel designs and lengths. Comparing the 708 to the M704 there are some noticeable improvements, as well as some faults. First off, it’s not full metal. I don’t mind this fact, but it could be perceived as a fault. Second off, it’s sold with this cheap plastic grip. I immediately switch this cheap plastic grip (that slides out of your hand) with the black rubber grip I had on my 708. Then I sold the 708 LMAO. Looks and feels much better with the black rubber grip. Does airsoftmegastore.com sell pistol grips separately? Well they should if they don’t. I have to say I like the fact that it is lighter than the 708. With a longer barrel you would assume it would be heavier, but no. Instead it’s lighter, easier to aim, more accurate (I use .25’s), and more powerful. Instead of the BB’s getting loaded into fake shells then being loaded into the cylinder, you will notice this is not the case with the M704 and the M705. Instead the BB’s are loaded into a speed loader disk, and that disk is loaded into the back of the cylinder. This is a very big improvement. You cannot put fake shells in these two guns. The holes in the cylinder are smaller. The cylinder is built to contain the burst of co2 better than previous models. This is why the M704 and the M705 are more powerful, more accurate, and quieter than previous models. airsoftmegastore.com ONLY."