Front gas block canted - Range update p3

[teamja2]

Just got my new 16" thumper upper assembly and looking at it the front gas block is noticeably canted right compared to the rail on the upper receiver. Sent an email to bushmaster to see what the next steps are. Slightly frustrated because I want iron sights on this rifle and don't want to try adjusting myself on something unfired.

[commander faschisto]

I'm just an AR newbie here, but I definitely would not fire it just yet...it will probably short stroke on ya, because chances are that the barrel vent hole is not aligned with the gas block hole, eh. There are supposed to be dimples in the barrel to align the setscrews, so the fix is probably (???) realtively simple. Then again, some of those things were assembled with loctite, taper fit, etc., who knows?

Hey, guys, can ya hook a brother up here?

[Texas Sheepdawg]

I've heard of one or two of these cases. The Gurus will be checking in Directly. But CF I believe is right especially about waiting to fire it until you get the gas block realigned. I also think that there is some type of index. I can't give any reason why it Canted, it's very painful to think Bushmaster employees dropped the ball here, it could have just sneaked past QC. I would be on the phone with them immediately and I would not discuss my issue with anyone but a manager. Do NOT talk the the CSR guy named Aaron. He's a first class jer..... Uh, rookie.
But don't sweat it too much. It's a very easy fix and shouldn't have to go back.
Check your PM.

[BayouBob]

If it's the front gas block it isn't doing anything but sitting there. It's not connected to the gas tube.

[commander faschisto]

Ahh...very pertinent point. As they used to tell us in school before a test: RTFQ!!! A 20" tube has a "front" gas block that is just a mount base for Bushy's "V-Match" sight accessories. On your 16" rig, that is indeed the actual gas block/sight base. Gurus will be along shortly. Listen carefully.

[Hoot]

I don't own the carbine version, but on my 20 inch model, the second thing to go in the junk box was the unneeded forward gas block. under it was witness indentations to assure correct alignment



Assuming the closer block has the same indentations, they will guide you in aligning the block.

BTW, the first thing off was the Izzy muzzle brake [cough] flash hider [/cough].

Hoot

[Texas Sheepdawg]

A 20" 450B has two gas blocks. The one out in front of the hand guard is a nonfunctional block. The functional gas block in under the hand guard.
HOWEVER
The 16" 450 B gas block with the rails on it IS the functioning gas block and is the only gas block on the barrel. I posted a thread about this several months ago and I will dig it up and post the link here for all to check out.

[Texas Sheepdawg]

Here is a thread regarding gas blocks. Enjoy!
viewtopic.php?f=2&t=1235

[teamja2]

I should say I understand stuff happens and I'm sure they will make it right. It probably just slipped through the cracks. No hard feelings just want it right. It's noticeable enough that you can see it in a picture taken down the barrel.

I'll add functionally it would most likely be fine just iron sights would be hard if not impossible to zero.

Ryan

[Texas Sheepdawg]

Here is a video by Brownells regarding AR gas blocks.
Check out this video on YouTube:

http://www.youtube.com/watch?v=g9H0M8VH ... ata_player

I'm sure you can find tons of related videos from this video.
But I try to stay with the Brownells, Midway, and other professional
Video channels and steer away from "Joe Bob" in his basement.