Not sure if you know about it already, but with the the GM's bazooka, if it's anything like the Origin Gundam's bazooka, you can angle the handle so the bazooka will rest on the shoulder.
Unfortunately, even with the moving grip on the GM's bazooka, it cannot seat on the shoulder. It's also depicted this way in a picture on the side of the box, where they have it sitting off to the side of the arm.
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Not sure if you know about it already, but with the the GM's bazooka, if it's anything like the Origin Gundam's bazooka, you can angle the handle so the bazooka will rest on the shoulder.
Unfortunately, even with the moving grip on the GM's bazooka, it cannot seat on the shoulder. It's also depicted this way in a picture on the side of the box, where they have it sitting off to the side of the arm.
That's a shame, as the Gundam Origin ver didn't have that problem at all, and it looks like the GM shared many of the Gundam's parts.