ok, I shot two AR's today. A RRA 20"dcm with iron sights, and a m4 AR15 from bushmaster. The m4 was equipped with arms 51 mount and a Eotech.
At 100yards, I was shooting 1" groups with the RRA DCM. (winchester 45 grain 223)
At 50yards, I was shooting 6" groups with the m4. (LC XM193 from '02).
Now, I know the DCM has a floated barrel, and the m4 does not. The ARMS mount is not floated, but is an extremely rigid setup.
Has anyone every been unsatisfied with the accuracy of a non free floated arms 51 setup?