
Originally Posted by
sff70
I'm going to the F2/F4 SBR build through Rainier Arms.
For this particular rifle, I want to cut down the existing barrel (Stag M4 14.5" with perm attached phantom) to 10.3".
RA can do the cut and thread work, and enlarge the gas port.
I need an idea of what size the gas port needs to be . . . ammo will be Speer 55 GD, AE .223, PMC Bronze, and occasionally some M193 or M855. I do not use Tula, Brown Bear, Wolf, etc.
I have read that the MK18 spec calls for .070" and a H2. My best guess, having looked at this on different boards for months, is to go with 0.73", so it'll run .223 pressure ammo.
Suppressors I have are a AAC 556-SD and a 762 SDN-6. I can use whatever buffer and spring I want. I use Colt gold extractor springs and carbine (black) inserts.
Been looking through a lot of threads for months but not seeing an answer to my particular situation, hence I'm asking.
Thanks, guys.
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