New to the Contender world.....I am trying to understand if the Contender barrel's will fit both a G1 and a G2 or are they specific to each? If I have a G1 frame, can I only use G1 barrels? And vice versa. I found a video explaining the differences between the G1 the G2 and Encore frames, so I am thinking the barrels have to be generation specific. But, like I said, I am new to all this and just getting started.