well it really depends, the APEX tip looks like a small plastic cup in front of the barrel only black. You can always take it off though, so you can get any barrel and either buy a UMS APEX adapter or make one yourself with tape, eitherway you will need at least an 1 and half for the tape adapter and according to UMS 2 inches for their APEX adapter. Also you can always make an APEX tip cover out of PVC pipe and make it look like a silencer. And if you are creative enough you can even make it so you can still adjust the ramp and twist the tip.

btw you don't have to get a "APEX ready" barrel iun order to use an APEX tip, getting one of those just saves you the time of getting a UMS adapter or making your own with tape.

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