Thought I'd mention that over on The High Road a gentleman is running a comparison of the two rifles.

Spoiler - the Sport was out shooting the Colt every time and sometimes drastically so depending on what type/grain was used. Obviously the Sports 5R rifling is showing its superiority. Some folks were already disputing his findings!

Waiting for the Colt fanboys to get their panties in a bunch.

You wont have to wait long!!

__________________
Grover Oathkeeper

The OP at the High Road forum stated the Sport had a different throat than the mil-spec Colt. Does anyone have any info on the Sport throat?

Both barrels are marked 5.56, but the Sport throat read .14 on a merchant throat gauge and the Colt 6920 read .15. By comparison a Colt Hbar I have read .14 and a Bushmaster XM 15 read .11.

Matthew Courtney

Have you ever noted the throats or free bore to be longer on newer bolt action rifles chambered in .223 with twist rates in the 1 in 9 range.