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Posted: 3/24/2006 7:12:42 PM EDT
I'm building a flat top free floated varmint upper for my AR. After looking at low profile and railed gas blocks I guess I'd like a single railed gas block. They make steel and aluminum versions. Is one any better than the other? Who makes a decent gas block that isn't pricey? I certainly want a quality part that fits well and won't leak. Any suggestions? Thanks, Whipper
Link Posted: 3/28/2006 11:17:18 PM EDT
have you ordered the barrel already? i would just cut down the original front sight base to make a gas block. it would be robust and mated perfectly to your barrel. best of all, it's cheaper.
Link Posted: 3/29/2006 12:02:52 AM EDT
Steel all the way.

Aluminium and steel have different thermal expansion properties. Because of the high temperatures involved, having a steel barrel and an aluminium gas block is a bad idea.
Link Posted: 3/29/2006 5:15:09 AM EDT
If you are using a stainless steel barrel you should use a stainless steel gas block. That will give you the least headaches. Aluminum reacts to temperature changes much faster so you can have gas issues. Keeping everything made from the same material is the ideal situation.

Link Posted: 3/29/2006 6:38:20 AM EDT

Originally Posted By faethor:
have you ordered the barrel already? i would just cut down the original front sight base to make a gas block. it would be robust and mated perfectly to your barrel. best of all, it's cheaper.



+1 - This way you get a clean tight fit.
Link Posted: 3/29/2006 6:53:02 AM EDT
Anyone know where steel gas block can be found in .850 or larger diameters?
Link Posted: 3/29/2006 7:12:14 AM EDT
[Last Edit: 3/29/2006 7:12:49 AM EDT by bnorman]

Originally Posted By faethor:
have you ordered the barrel already? i would just cut down the original front sight base to make a gas block. it would be robust and mated perfectly to your barrel. best of all, it's cheaper.




Originally Posted By whipper_1999:
I'm building a flat top free floated varmint upper for my AR. After looking at low profile and railed gas blocks I guess I'd like a single railed gas block. They make steel and aluminum versions. Is one any better than the other? Who makes a decent gas block that isn't pricey? I certainly want a quality part that fits well and won't leak. Any suggestions? Thanks, Whipper

Link Posted: 3/29/2006 7:14:56 AM EDT
I run an aluminum .750" adjustable JP gas block which runs fine on my 3 gun rifle. I haven't got it hot enough I guess to make it fail. YMMV.
Link Posted: 3/29/2006 7:22:23 AM EDT
I run both types and never had a problem with any. But steel is the better choice.
Link Posted: 3/29/2006 7:31:07 AM EDT

Originally Posted By glock24:
Anyone know where steel gas block can be found in .850 or larger diameters?



Anybody?
Link Posted: 3/29/2006 7:53:08 AM EDT

Originally Posted By glock24:

Originally Posted By glock24:
Anyone know where steel gas block can be found in .850 or larger diameters?



Anybody?



Larue makes a .875"
Link Posted: 3/29/2006 3:42:14 PM EDT
jp has a ss single rail adj .936".
Link Posted: 3/29/2006 4:31:50 PM EDT
Link Posted: 3/29/2006 11:58:39 PM EDT

Originally Posted By Teknic:
Steel & Aluminum are about the same. Have you ever heard of any aluminum gas blocks failing??



Zak's 2004 ITRC report mentoned some aluminum gas blocks failing, but 500+ rounds in ~20 mins is pretty extreme.
Link Posted: 4/5/2006 8:28:26 AM EDT
Much to my surprise, the 1913 style gas block I ordered from Model 1 Sales is steel.
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