Gas port Diameter
 

Greetings,
What is the gas port diameter on the 16" 300whisper?
I need to block off one and drill another.
Thanks in advance,
Gos.

.125-.130 I would go with .125 check the thread on Model 1 Sales they talk about it there. I think someone said it's a number #31? Don't quote me on that. Look it up on that thread.

SS33 8)

Gas port diameter should be about .120, as most of the gas tubes/blocks are also that diameter. I think mine went a little larger, as that is where the bit I used left it.

Joel

I started out with .076" since I figured that it's always easier to make the hole bigger than smaller. After some loading development, I opened things up to .086". Everything cycles just fine at that diameter without the action getting that "slamming" feeling.

Gos.

You put it in the pistol location didn't you? I think it works with a .125 in the CAR location and from what I've seen elsewere around .085 works for the pistol location.

SS33

Mine is .120 on a model one 16 inch barrel with an adjustable gas tube. I shoot mostly 150 gn bullets at 1050fps. Works without any malfunctions.

Nope,
I heat shrunk a SS sleeve around the pistol gas port and drilled another hole up at the front sight mount. I do have to offer a correction however. The barrel is not a 300whisper, but a wildcat that I've been working on. It is a .308 in bullet dia and 150gr weight. I'm able to reach 2,280fps out of this 16" barrel.
Gos.

Did you do this yourself?
 

When you opened up the gas port (Tony from Del-Ton advised me to do this on my upper that is arriving soon) did you do this yourself or did you take it to a gunsmith to have it done?

If you were able to do this yourself (I have a machinist's drill press available for my use) where did you purchase the drill bit (Brownell's??) and was it a special type of bit?

Thanks for helping me out.

tell us more!
 

Gos-

Would you care to share a little more info on your wildcat project? I would be very interested in a cartridge that can push a 150 gr bullet at 2280 fps.

Does it run on the AR15 platform? What is the COL? The 223 in the AR15 is 2.26.

What is the parent case?

320pf

Sorry for the quite late delay, but I did the "whole/hole" job myself. I have just a standard machinist drill set from #0-80, A-Z, and 1/16 - 1/2. That gets you close enough for just about anything. If your after a hole that you don't quite have, then use a smaller bit with a slice of shim stock of the proper thickness on one flute of the drill to make it run out of round, and thus drill out a bigger hole. Obviously, you need to do this when opening up a larger hole, not drilling one.
Hope this helps, and FYI I'm a tool and die grade machinist by trade.

Gos