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Old June 18th, 2019, 05:01 PM #1
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best handguard length for adj mid length gas system

Hey all,

need some help with my next build. Right now I'm looking at a 6.8 upper from https://www.blackstonearms.com/category-s/100.htm With a 16" barrel and adjustable gas block, what length rail should I go with? Choices are 11, 13.7, and 15". Going to be mostly a bench rest and hunting gun, but also has to support a suppressor. 11" would keep the gas block accessible, but I would prefer a longer rail. I asked them if they can source the 12" m-lok rail, as I think that would be a happy compromise. Or should I just get the 13.7 (designed for 14.5" barrel I know) and find a longer allen wrench? pictures of similar builds would be greatly appreciated!

thanks,
Dave
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Old June 18th, 2019, 05:47 PM #2
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I'd say 11". Mid-lenght GB on my two ARs is still kinda far back, I have 13" BCM and Noveske hand guards. Depending on how easy/hard it is to adjust 13" could be to difficult.
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Old June 18th, 2019, 06:49 PM #3
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Liking the 11" idea more and more. Less weight up front the better too when can is attached.
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Old June 18th, 2019, 06:57 PM #4
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Quote:
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Liking the 11" idea more and more. Less weight up front the better too when can is attached.
I wouldn't go beyond 11"

I can't read so good, I didn't see which upper you were looking at or what gas length. I prefer 10.5", whether it's an SBR or full length rifle, but the brand and type I use doesn't make an 11" so...
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Old June 18th, 2019, 07:40 PM #5
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Mid length gas block
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Old June 18th, 2019, 08:06 PM #6
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I'll look at mine later and post a pic ,if it will help.
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Old June 18th, 2019, 11:42 PM #7
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Here is my 13" BCM HG. Mid length gas tube. Its @3" from the edge of the HG to the front of the gas block. Hope it helps.
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Old June 18th, 2019, 11:43 PM #8
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Oh, the pic would help. Duh.
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Old June 19th, 2019, 07:08 AM #9
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Quote:
Originally Posted by Dave View Post
Mid length gas block
You could go longer, depending on the GB. If it's an allen key type, you can get any length driver to reach it. If it is a lever or knob type(usually having only 3 settings), it will probably need to be exposed to digital manipulation. It will need to be exposed.
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Old June 19th, 2019, 09:55 AM #10
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Quote:
Originally Posted by outrider58 View Post
You could go longer, depending on the GB. If it's an allen key type, you can get any length driver to reach it. If it is a lever or knob type(usually having only 3 settings), it will probably need to be exposed to digital manipulation. It will need to be exposed.
good point. It's allen, but wanted a lever. If they can source a lever block, I'll go 11, if not, I'll probably stick with 12 as a happy medium
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