Hey everyone.
I just got an M-223 scope for my AR and I'd like to buy a 24" upper for it so I can keep my Eotech on my 16" and swap out the upper with the M-223 for long range shooting.
Here is the question...the M-223 has an elevation adjustment for a 55gr .223 round for 100-600 yards. Id like to use this adjustment to its fullest capability so id like to shoot a 55gr bullet. From my research, I see that a 1:9 twist is best for 55gr but I am having trouble finding a long barrel 1:9 twist.
Can you guys help out? I'm thinking longer is better so a 24" complete upper in 1:9 twist would be nice. Any suggestions? Thanks.
I just got an M-223 scope for my AR and I'd like to buy a 24" upper for it so I can keep my Eotech on my 16" and swap out the upper with the M-223 for long range shooting.
Here is the question...the M-223 has an elevation adjustment for a 55gr .223 round for 100-600 yards. Id like to use this adjustment to its fullest capability so id like to shoot a 55gr bullet. From my research, I see that a 1:9 twist is best for 55gr but I am having trouble finding a long barrel 1:9 twist.
Can you guys help out? I'm thinking longer is better so a 24" complete upper in 1:9 twist would be nice. Any suggestions? Thanks.

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