I just purchased a Spyder Pilot (ACS) and its doing well. I recently upgraded the barrel to a LAPCO 14 inch. Now im focusing on getting rid of me 20 oz. C02 tank, and purchasing a nitrogen tank. I was looking at a Pure Energy 48 cu in 3000 psi tank. Also if you could, could you tell me wat the hell a 48 cu in 3000 tank means.