This pts Masada was fully upgraded from the ground up by fox customs. Everything from the gearbox up has been upgraded including the barrel which is a 509 mm 6.02mm tight bored barrel with a professionally installed r hop. The pts Masada also come with a quick spring change system which allows the user to change the fps with different weight springs in about 5 mins. As it is configured right now it has 1.77j or about 440 fps with 0.2g bbs. If you have any other questions don't be afraid to ask Note hand guard has a small crack next to the take down pin PayPal only