Delrin bolt and trigger
Light and small
None except, maybe too small?
I just got it and it seems really light, it litterally drop the net weight of my gun in half (I used to have a 72/300 steel weight for a tank) I still dont know what my efficiency or consistancy will be from this tank yet, I will edit this back when i Get that information.
P.S.- If u already have a 68cu tank cover, it might not fit right on this one
Great light and small tank, have not put into full use yet.... I cant give it a 10 yet, but i also cant give it an 8 or 9, so i give it the benefit of the doubt and give it a 1... J/K 10