I have a umarex 416 D and at the moment it has all standard parts except for a 6.03 mad bull barrel I was wondering what would be the best choice of hop up unit to improve the performance of the gun.
I am fairly new to airsoft, and I am in the process of obtaining my UKARA once I do I am looking at purchasing an M4. I was wondering If any one had any advice on a decent one to get, my budget is £250 also I would quite like the gun to have ris rails.