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Mr. Maim - I went ahead and pulled out a burst pack and a FBI pack for comparison. GM is right there are differences in the boxes. I won't go into a discussion of exactly what is different because, frankly, I don't understand all the internal goings on in a burst pack. See photo.

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The reduced notch in the burst pack behind the trigger is required to keep the sear latch axle in place. Any of these boxes can be converted to another type with a bit of machining and maybe welding. So if you can't do those, be sure to get the right frame. But in all my years, I've never had a reason to order an empty frame.


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