Originally Posted by fupuk
I was just wondering what other caliber I could make with the lower if I got it
Any/all of the above! The upper assembly is usually the only part caliber specific. Not counting things like mag blocks for the pistol mags and special mags for 6.5/6.8. 6.5/6.8 also takes a different bolt head on a stock carrier.
5.56, 6.5/6.8, 22lr, 458/50 are the most common. Probably 95% of all AR's are in these calibers. Most of the real oddballs are a PITA to find parts for at the best of times. Lots of custom gunsmithing to get them to work. Good luck, and have fun building!
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Last edited by dwmiller; 12-10-2013 at 04:32 PM.