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Posted: 9/12/2005 5:56:19 AM EDT
On a low-profile gas block, how much "cant" is acceptable?

I have a RECCE upper, WOA SS middie bbl with a KAC mid-length FF-RAS.

The low-pro gas block is a set-screw PRI.

The gas block is canted slightly to the right. I have not had a chance to fire the upper yet, and I am sure it will be fine, but I was just curious, because I have never installed a gas block before.

Is the hole in the gas block larger around than the gas port hole in the bbl? If so, this would allow for some degree of cant, due to the larger hole over the smaller gas port one.

Anyone have any thoughts on this?
Link Posted: 9/12/2005 7:25:14 AM EDT
Generally speaking, the hole in the gas block will be in the 0.125-0.135" range, based on my random measuring. The gas port in the barrel is generally under 0.100", so some slight misalignment is fine. If it is noticably canted to the casual observer, I'd fix it.
Link Posted: 9/12/2005 7:47:56 AM EDT
[Last Edit: 9/12/2005 12:26:48 PM EDT by Zarathustra1]
Mongo,

Here is a pic. Does it seem canted to the rifle's right side in the pic?

The builder of the upper thinks it is an optical illusion, or something with the RAS, but I am not sure.

I am not all that worried about it really. I am just curious about any potential problems.

Does that look like too much cant?

http://i18.photobucket.com/albums/b109/Gewehr1/HPIM0279.jpg
Link Posted: 9/12/2005 9:06:21 AM EDT

Originally Posted By Zarathustra1:
Mongo,

Here is a pic. Does it seem canted to the rifle's right side in the pic?

The builder of the upper thinks it is an optical illusion, or something with the RAS, but I am not sure.

I am not all that worried about it really. I am just curious about any potential problems.

Does that look like too much cant?

www.imagestation.com/picture/sraid186/p71516656abcbb4466131842deae6fd28/f2568896.jpg.orig.jpg



I can't see the pic right now (it may be a work block). I'll check it out when I get home.
Link Posted: 9/12/2005 9:28:24 AM EDT
I can't see it either...try hosting the pic somewhere else. www.photobucket.com is my fav.
Link Posted: 9/12/2005 12:19:19 PM EDT
Well hell. Imagestation is crappin out on me.

Link Posted: 9/12/2005 1:29:13 PM EDT
Link Posted: 9/12/2005 1:38:42 PM EDT

Originally Posted By Zarathustra1:
Mongo,

Here is a pic. Does it seem canted to the rifle's right side in the pic?

The builder of the upper thinks it is an optical illusion, or something with the RAS, but I am not sure.

I am not all that worried about it really. I am just curious about any potential problems.

Does that look like too much cant?

i18.photobucket.com/albums/b109/Gewehr1/HPIM0279.jpg



It looks, from the pic, to be marginally canted to the left. I mean maybe a little to the left (from the perspective of looking down the muzzle). That said, if the gun cycles properly I wouldn't wory about it. As long as the hole in the block is aligned with the gas hole in the receiver, ya should be good to go.

Link Posted: 9/12/2005 1:45:59 PM EDT
Honestly I'm sure it will function fine. I was never really worried about that.

I was mainly curious if the gas port hole in the bbl could be partially obscured from just that little bit of cant or not.

It seems that if it were partially obscured by the gas block opening, it would cycle alright, but create a "lip" at that opening where carbon could accumulate.

I'm sure it is fine. I just wanted to get people's thoughts about it.



Link Posted: 9/12/2005 1:50:43 PM EDT
I use my friggin' calipers to ensure 100% hole to hole alignment. That said, I have a gun where the gas block appears to be slightly canted. I've removed and reinstalled it with the same result. It could just be that the top of the gas block is not true and gives the visual effect of being canted. Instead of a visual, try check to see if the gas tube hole on the muzzle side face of the gas block is centered with the middle of the barrel.
Link Posted: 9/12/2005 2:16:26 PM EDT
Looks good to me.
Link Posted: 9/12/2005 2:19:25 PM EDT
Come on now...it's clearly canted about 4 thousanths of an inch to the left.



Originally Posted By mongo001:
Looks good to me.

Link Posted: 9/12/2005 2:20:36 PM EDT
[Last Edit: 9/12/2005 2:21:41 PM EDT by Zarathustra1]
Yea yea, I know...I'm being too picky. h
Link Posted: 9/12/2005 2:24:32 PM EDT
[Last Edit: 9/12/2005 2:25:25 PM EDT by KnobCreek]

Originally Posted By Zarathustra1:
Yea yea, I know...I'm being too picky.


Nah, it's always my biggest concern when I do a build. Being that it's a gas operated system, it's kinda important to maximize the amount of gas available for cycling the action.
Link Posted: 9/12/2005 2:27:04 PM EDT
[Last Edit: 9/12/2005 2:27:50 PM EDT by Zarathustra1]
Yea, I suppose I should just get off my ass and go test it out.

Grad school is a very prolific killer of free time...that and ARF.com...
Link Posted: 9/12/2005 3:31:41 PM EDT
[Last Edit: 9/12/2005 3:32:00 PM EDT by KnobCreek]

Originally Posted By Zarathustra1:
Yea, I suppose I should just get off my ass and go test it out.

Grad school is a very prolific killer of free time...that and ARF.com...



Grad school definitely is a time sucker. Then the weekend comes and the real work begins. God I hated it....but made more money afterward to buy more squirt guns and squirt gun accessories.
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