I had an Interarms MkX .223.
It was OK, about 3/4" - 1 1/2" 5 shot groups @ 100, a 5.56 chamber with a 12" twist. The magazine was long enough that I could seat bullets out to 2.29".
It was a nice, light, handy rifle, death on groundhogs.
The magazine spring broke, and boy was that tough to replace!
