For starters:
I REALLY hate the look of Van Buren Magnum models. That's why I've tried to make those two my way. I don't know if you guys will like it, but I guess it was worth a try. I've changed textures only, since speedloader is an additional part, that won't be seen while the gun is used.
Stock:
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Speedloader:
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Please, comment, while I'll work on 223 and 14mm guns
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Edit:
Hmm... I've modified those textures - not sure if I did it right though.... I've also made the 14mm's handle a little bit smaller as suggested some time ago.
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BTW - Those Magnums have about 240 tris.