XCR Factory (and Custom) Port Specs

[Sean K.]

Are talking about the latest one I sent you? I think I held onto that one because it was one of the few type 3s that would actually turn off the gas on "0". There was a thread way back where I noticed the detents and the gas dial ports weren't lined up. Is that what your'e talking about?

https://www.xcrforum.com/forum/15-fi...ays-off-3.html

It is the latest one you sent, but I haven't looked to see if the detents and ports lined up. I hope that doesn't mean it's going to have cycling problems on super sonics since the ports don't line up

[navalbeaver]

It is the latest one you sent, but I haven't looked to see if the detents and ports lined up. I hope that doesn't mean it's going to have cycling problems on super sonics since the ports don't line up

I think they do line up because I kept it because the ones that lined up suppress better.

[Sean K.]

I think they do line up because I kept it because the ones that lined up suppress better.

Shoot. I wish you hadn't sent it to me if you wanted it for suppressed. Worse yet, I already modded it....so it wouldn't do any good to send it back (Unless you needed more gas on the higher settings).

If you want it though...let me know.

[navalbeaver]

Shoot. I wish you hadn't sent it to me if you wanted it for suppressed. Worse yet, I already modded it....so it wouldn't do any good to send it back (Unless you needed more gas on the higher settings).

If you want it though...let me know.

It's not a problem. Wouldn't have let it go if I needed it. I've been tinkering with the type 0 and 2s lately anyway

[Sean K.]

JFYI Nate,

Zero did NOT turn off the gas. Gun ran really well on zero with supers....55 gr. IMI M193.


You were right....no need to open any of the ports. It was chucking brass hard AF and 30' or more on setting 2. It was odd that it was throwing it 4-5 o'clock rather than forward or 3 o'clock.

[Sean K.]

Stock from Rob Arms Type 3 Dial Port Sizes in 6.5G with 11" bbl:

7=.082"
6=.076
5=.070
4=.067
3=.064

I don't have calibrated gauge pins for the smaller sizes....drill bit wise they are apparently smaller than .040 thou.


I believe this is the wrong dial for this caliber (or just as likely....the bbl length since it's already 15 thou bigger than the "small hole" dial in post #15). I'll have to contact RA to verify.


Bbl port is ~.078" currently....it will take both a .081 and .082 gauge pin in the beginning of the hole, but won't go all the way through.

Gas block port is .125".

***EDIT***Drilled my bbl port to .082"....hopefully that will help with the bolt over base malfunctions I've been having and the bolt not locking back on empty. Not super concerned about erratic ejection unless it's so weak that it might get stuck in the port.