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Posted: 9/25/2003 2:38:10 PM EDT
Hi,
I recently got a AR upper, RRA 9mm with A2 sites
same as one pictured here.
http://www.rockriverarms.com/9mm_parts.htm

I know there isn't the provision for the Gas tube on this upper, but beside that are there any other diferences that will stop me from drilling the gas tube detail(I have plans and a mill), then using this with a std .223 bolt/barrel, etc.

Thanks for your time
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