[SDU_Phil]

outer barrels for agm/wa are interchangeable. The one you listed will be fine, however if you are planning to use a prime rear adjust aeg hop up for it please keep it mind what a b*tch iit is to adjust it. trust me i know =(

If you are using a regular Knights type RIS with the bottom rail removeable, I'd recommend the AEG hop up by PGC instead as it is easier to access.

edit: what kinda build do you have in mind? also note that that some outer barrels have a thicker base and will affect how some rails mount to the gun.