It needs to be fed with at least good quality 0.28 BB's, because mine was very inaccurate with 0.20 indoors, without any air movement (can't imagine how it would performed outside). And you might need the CQB bolt for it, or less powerful gas, because with heavy BB, it can creep well beyond 1.5J which could be too high, especially in CQB games. Other than that, this is a very well built, nice and fun replica. It is light, small, powerful and have options to being modified and/or upgraded, thanks to the rails and aftermarket parts (like Wii-Tech) and no fixed front grip. The magazines are extremely sturdy and have very high gas capacity. RoF in full auto is brutal, you can send out the whole mag of BB's in no time. Trigger has a bit high backlash for my taste, but you can also tune that with aftermarket parts or some mechanic skill. Buy a few spare parts (#151, #153 and nozzle/cylinder with springs) and you will be happy for a long time!