I would say it's custom built....
I'm not actually sure on the brand of my rifle either. All I know is that it's custom built cause the seller didn't have any info on the internals for me or anything.
Also, you shouldn't say your rifle is a SystemA. In my eyes that implies that it's a PTW. You should probably say that it's built with SystemA AEG internals.
Just like if you had an Aftermath but swapped every single part it's not really an aftermath anymore. Sure it may have been the base gun but if everything inside is Prometheus for example, and the externals have all been swapped out (ie. body for an Element receiver, furniture is new, etc. (except maybe a few random screws)) it's not really an Aftermath anymore and more akin to building a gun from scratch IMO.
ಠ_ಠLess QQ more Pew Pew
READY TO >> RACE