Gas port size for Ar 15 pistol

[Deleted member 110089]

I bought this upper and didn’t realize it came with a .70 gas port hole. Would I run into in issues if I get a gunsmith to open up to a .750 so I can run steel cases ammo or weak 223 brass ? I already tried different buffers to see if I could make it run 233 but no luck

UPPER CRANE SPEC | 10.3 INCH PARTIAL UPPER | ANDRO CORP

UPPER CRANE SPEC | MK18 CLONES | 1 MOA Guarantee | Do You Run Suppressed | Reduced Gas | Partial Upper for those who have a rail already |

androcorpind.com

 

[KOMRAD]

Try a lightened BCG, with light buffer and spring.

 

[Deleted member 110089]

Try a lightened BCG, with light buffer and spring.

I did, I ran carbine weight, H1 and H2

 

[Dirty J]

Try a lightened BCG, with light buffer and spring.

Meh. A lightened BCG should be reserved for gamer guns only. Just an added failure point.

A hassle.. but much preferred over the typical over gassed barrels!.

 

[NWSharpshooter]

I've opened up undersized gas ports in the past.

.070 on a 10.3 is optimal if you want to shoot suppressed, so not optimal for you.

.075 will not be an issue. Daniel Defense 10.3 comes in with a .083

 

[Dirty J]

Or just follow their recommendations and use a suppressor.

 

[KOMRAD]

And the upper currently runs good with 5.56 M885 & M193 but not steel case?

 

[NWSharpshooter]

I see the undersized gas port on the 10.3 a lot because "milspec" is .070 or .071. The problem is "milspec" in that barrel length is intended to have a can hanging off the end of it. At least that is my thoughts.

Contact cmshoot . He'll get you running.

 

[November Sierra]

Use a can

 

[DeathBat]

I've opened up undersized gas ports in the past.

.070 on a 10.3 is optimal if you want to shoot suppressed, so not optimal for you.

.075 will not be an issue. Daniel Defense 10.3 comes in with a .083

Kinda late but I’m also having questions with this, what would be a good gas port size for non suppressed? I’m wanting to run both and shoot steel/brass but not sure if I’ll run into issues