We bought this for my stepson for Christmas brand new. On its first day out it chrono’ d at just 190fps, however the store we got it from was great and replaced it with a brand new one which we tested in store and came out consistently at 320fps with 0.2g bb's, so we are selling as new. I'm selling this as my stepson complains it's too heavy for him. It's not heavy at all, he just plays too much CoD and has no idea what a real gun weighs!
Included is a second XR-5 mag, although regular M4 mags fit fine. I've had several Nuprol flash mags in there without any issues. The gun comes fully boxed with a 1300 mAh 7.4 LiPo with tamiya connector. I really like the look of this gun and would consider keeping it and modding it if I hadn't already got a TM HK416.
Interesting fact: This particular model of gun is often used in Sci Fi TV and movies as a prop. Most recently I saw it in the latest season of The Expanse.