If I recall correctly, there are 2 versions of the Double Eagle L96.
First version is a completely proprietary, non compatible version, meaning you basically can't do squat with it. I think it's almost like an AGM L96, but with even weirder parts or something.
The 2nd version is a V.1 L96. This has crappy sears, the "jesus pin" aka "golden pin of death," and an easily removable orange tip that hides a black tip underneath. The removable orange tip and black tip underneath is, I believe, the best way for you to tell which one you have. If you can remove the tip and there's a black tip underneath, odds are that you have the V.1 L96, and that means you can put standard APS2 parts in it.
DE may have come out with a V.2 clone though (aka, the one that UTG and Well produce now) and I might not have known, simply because I don't personally follow DE, which is sort of dead now. A V.2 will have a glued-on and nearly unremovable orange tip, hardened sears, and no "golden pin." The golden pin and orange tip are the best ways for you to tell the difference.