Question fro Mr. Randall Rausch

AR/M4 AR Technical Discussion
1

Sir,

I am building a new Stainless Steel 12,5" barrel from a Delcour (Belgian barrel maker) barrel blank.

1/9" twist. 5,56 Target chamber (JGS reamers). Barrel diameter at the fsb. 0.750".

I will only use 5,56 NATO pressure ammunitions.

I would like to know Which gas port diameter you will recommend for that particular configuration?

Many thanks.

Marc.
Belgium.

2

Question answered and data removed now that the info has been passed on.

3

Yes Sir, the gas port will be drilled at the std. carbine location.
Many thanks for your very fast and accurate answer.
Your help is very appreciated and avoid me to made a mistake on a high grade barrel!
Again thank you.
Marc.
Belgium.