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Old September 20, 2008, 10:08 PM   #1
Senior Member
Join Date: August 2, 2001
Posts: 4,988
AR-15 caliber list

How about an AR-15 caliber listing challenge?

I'm going to ask each person who reads the thread to add a post with one single factory caliber which is available for the AR-15 and the trade name of an AR or upper in that caliber.

Please don't repeat calibers that were already mentioned or list a bunch of calibers in your post.

It's OK to count military and civilian calibers as 2 different ones (but please only list one in your post) and its OK to include single shot factory uppers. But no wildcat uppers please unless you know a factory which makes them. For the oddball calibers weblinks would be appreciated.

I'll go first with my favorite:

6.5mm Grendel, rifles made by Alexander Arms.
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