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It doesn't make much sense to use a .22 LR conversion for a weapon that's already shooting 5.56mm
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1/4 or less the price...
The military and federal LE agencies in general do not use rimfire. They prefer to practice with "duty" ammunition identical to what is used in the field. Not their money, so an easy decision. Of course, we occasionally get a post here about a military unit burning through excess ammunition as fast as possible at the end of the fiscal year so they get the same allotment the next year. No reason to worry about practice cost if you are doing full auto mag dumps until the barrel melts just to use up your allotment.