I don't know how well the G44 will or will not sell, but I don't think it makes much sense.
I had a .22 conversion kit for my 1911 and didn't like it. The feel of the gun was SO different, even with my same grips and trigger, it absolutely did not feel like I was training with my 1911 and just using cheaper ammo. It felt like an entirely different gun. Plus the thing we are usually trying to master when we practice is trigger control and flinching. Your trigger control and flinch is NOT the same when you know you're shooting .22lr vs .45 ACP or even 9mm.
I handled the G44 this past Saturday. Even if the weight of the mag were increased, the gun itself is like 6 ounces lighter than a G19--that's a major difference.
If you use .22lr for basic skill drills, that's fine. We all do it. But...if you're in the market for a .22lr, then get one that suits your intended purpose. I can't really think of a purpose where the G44 is the best choice.
