It's a direct replacement for any standard hopup bucking. If the hopup chamber takes a standard bucking, it'll take this. In a nutshell, I don't see why any commonly available AEG should not be able to use it. Most, if not all GBB's, NBB's, AEP's and bolt actions don't use the AEG type hopup system (sleeve & bucking assembly) so it will not work in those. Nor would it work in a PTW as the hopup system is very different with no compatible parts to AEG's
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