Doesn't anything larger than .50 Caliber (approx 12.7mm) is a destructive device that will get you into the category of NFA stuff?
I thought that .50 caliber firearms and ammunition were the largest you could legally own in the USA as a civilian under the GCA...
http://www.xdtalk.com/forums/xdtalk-...-question.html
Marc
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Igitur si vis pacem, para bellum -
- Therefore if you want peace, prepare for war.