Mega 1:8 twist barrel for AR pistol build

[Nelson]

I was looking at a Mega Arms 223 upper kit that had their 10.5" barrel but it had a 1:8 twist. The quality looks great and I already have the lower but I wasn't sure if I should stick with a 1:7 twist. I will be mostly shooting 55 gr Federal. Any thoughts if I will be lacking with the 1:8?

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[B5Ben]

I think the 1/8 will be fine and give a little more flexibility if you decide to shoot anything heavier.

 

[mjbskwim]

I have had good success with 1/8 twist on the rifles I have built.
Usually the twist I try to buy

 

[Nelson]

I have had good success with 1/8 twist on the rifles I have built.
Usually the twist I try to buy

mjbskwim,

Does that include your builds 10.5" and under?

 

[jluck]

I think the 1/8 will be fine and give a little more flexibility if you decide to shoot anything heavier.

Faster twist for heavier bullets. Slower for lighter. Either one would be indistinguishable in a pistol application neither will keyhole.

 

[mjbskwim]

mjbskwim,

Does that include your builds 10.5" and under?

The 12in I did I shot with no problems. I did drill the gas hole out on the barrel a little,per watching some vids from ar15.com
My 10in build I never shot,but the guys who bought it made a couple adjustments and it did fine.
I can not say what the accuracy was on the 10in gun as I sold it before "I" shot it