I don't think there is anything special about acraglas other than it is marketed for gun work, and very expensive per unit volume, and usually mail order for most of us. I have not been overly impressed with it.
Most all epoxies comes from big chemical suppliers and are then packaged under various brand names: West System, Mas, Raka, Simpson, Devcon, Acraglas, etc. I believe 3M manufactures their own (called System 3). They are all very similar.
For what its worth, you can get quality epoxy for much less cost per unit volume by buying it at a wood working store (Woodcraft, Rockler, etc), or better yet a marine store (West Marine for example).
You will end up with way more than you need, but the packaging is also better and you can mix it with handy pumps. The shelf life is very long (years). You will find all sorts of uses for the stuff.
The 5 minute variety in the twin syringes is not any good.