Need recommendations for gas port size to get 7.5in 300blk running

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[ARCHIVED THREAD] - Need recommendations for gas port size to get 7.5in 300blk running

Posted: 5/19/2015 1:02:42 PM EDT

I have a Wilson combat 11.3 in barreled 300blk upper I'm cutting down to 7.5. As it stands I cant get last round bolt hold open with factory ammo. I figure after the chop the problem will only get worse. Figured I'd have the Smith open the gas port while its there. What size should I go with? Standard bcg, standard dpms buffer and spring.

Posted: 5/19/2015 1:09:45 PM EDT

[#1]

.125 1/8

Posted: 5/19/2015 1:48:16 PM EDT

[#2]

Quote History

Quoted:
.125 1/8

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Interesting, I thought .100 was huge. Guess not.

http://micromoa.com/300-blk-port-size-testing/

Posted: 5/19/2015 9:04:32 PM EDT

[#3]

I run .125 on sub and super pistol gas blk. Works fine for both with standard gas block and standard weight buffer..

Posted: 5/20/2015 7:09:42 AM EDT

[#4]

Have you shot this setup suppressed?

Posted: 5/20/2015 7:52:04 AM EDT

[#5]

My Wilson 8.5" is
At .110. I added an adj. Gas block.
It cycles bunny fart subs now.

Posted: 5/21/2015 11:35:11 AM EDT

[#6]

Would it cycle factory rem 220grain subs without the adj gas block?

Posted: 5/21/2015 11:36:22 AM EDT

[#7]

Yes

Posted: 5/22/2015 3:23:39 PM EDT

[#8]

I'm running .125 with a Syrac adjustable gas block, and it will cycle with pretty much anything with a standard buffer & spring if the gas block is adjusted correctly.

Posted: 6/7/2015 8:27:17 PM EDT

[#9]

I have a 16" carbine gas opened to .125 and it cycles all 4 supers/subs and suppressed supers/subs with no issues. I have a 1/8 twist and can stabilize up to 220smks. 240 were keyholing at 25 yards.

Hope this helps

Doc

Posted: 6/19/2015 8:35:21 PM EDT

[#10]

Running .095 now with 11.5 in Wilson combat cut down to 7.5in and runs flawlessly. Even stabilizes Missouri bullet company 245g bullets.

[ARCHIVED THREAD] - Need recommendations for gas port size to get 7.5in 300blk running

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