If the barrel and hop up fit loosely -you will probably have an air leak , which is slightly less popular than an STD. People will tell you to wrap teflon tape or dental floss around your rubber to try and get a snugger fit. To my way of thinking thats like eating Rice krispies with a coke spoon- almost a complete waste of time. My advice is to buy a hop up Rubber that has a ring or rings around the outside to prevent airleaks. For example the PDI W Hold that Stealth sells
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