Gas Block Help

**lahunter57** · 04-21-14, 08:59

A few weeks ago I ordered a barrel from Rainier Arms and a BCM gas block to go along with it. I had them pin the gas block to the barrel and when I received my order I noticed that the block wasn't fully seated against the shelf. In the pictures I've included you can clearly see the hole for the pin is seamless meaning that that's the location it would be in if I drove the pin in. I'm wondering if this is acceptable? I tried to remove the gas block but it's very tight and I don't have the proper tools with me (college apt). So what are your thoughts?

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**steyrman13** · 04-21-14, 09:04

That gap is for a handguard endcap if I'm not mistaken

**markm** · 04-21-14, 09:14

They pinned it perfectly.

**lahunter57** · 04-21-14, 09:18

Ok great! I was just checking as this is my first build.

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**markm** · 04-21-14, 09:27

It would probably still function if the block was flush on the shoulder because the inlet on the block is typically much larger than the port in the barrel. But where they've pinned it should put the block dead center over the port.

**lahunter57** · 04-21-14, 09:31

I see. That's why I tried to remove the block to see where the port on the barrel and the port on the block were but it's such a good fit that it wouldn't budge. Good to know though. I should have know Rainier knew what they were doing! Excellent work. Thanks for the help!

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**mpom** · 04-21-14, 10:04

The gap they left is there for a reason. Meant to accomodate a front cap used for plastic hanguards.
No need to change a thing!
What barrel did you get?

**lahunter57** · 04-21-14, 10:05

Rainier Ultramatch SPR

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**Ryno12** · 04-21-14, 10:11

Originally Posted by lahunter57

That's why I tried to remove the block to see where the port on the barrel and the port on the block were but it's such a good fit that it wouldn't budge.

Say what?

That's the whole point of pinning it... so it doesn't move.

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