I have been eyeing the 50GI conversion for about a year now. Two things have stopped me from pulling the trigger so to speak. The cost is more than I would have thought & the ammo is manufacturer specific. You have to buy the ammo from GI. They also will sell you the dyes & the cases to load it yourself, but the ammo isn't available out on the market. I just don't like the idea of having to buy the ammo from the gun manufacturer exclusively.