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Old July 17, 2012, 05:01 PM   #1
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Join Date: September 1, 2011
Posts: 3
AR-15 gas block question

After reading quite a bit about this, I have settled on a clamp-on, adjustable gas block with a flip-up front sight. I have my reasons for wanting those 3 features. However, no such object exists. I have a fully functional shop and a lot of metalworking know-how. This is my question:

Should I:
A. Buy an adjustable gas block with a rail on top and attach a flip-up sight

No smithing required...minor benefit
Can choose virtually any sight tower configuration, and change it later if I like...benefit
Sloppy connection between barrel and sight tower??? i dont know if that is true or not, but it seems less firm than an integrated sight would be...major potential disadvantage.


B. Buy a gasblock with an integral flip-up sight and install an adjusting screw (I would probably buy a PRI or a VLTOR, possibly a YHM).

So is a rail-mounted sight less reliable than an integrated sight?

Is there enough room in the GBs with integrated sights for me to install a adjusting screw? I dont know anyone that has one.

Are there other questions I should be asking here?

Any and all feedback or responses welcome!
kingfisher is offline  
Old July 17, 2012, 06:51 PM   #2
Join Date: April 3, 2011
Location: SouthEast AK
Posts: 92
Go with (a). The rail mounted front sight is only as "unreliable" as you make the connections, be they clamp-on or Picatinny. There are lots of options for front gas blocks with rails on top, and there is no "sloppy connection" if you do your work correctly.
Retired USN
Pain heals..... chicks dig scars......Glory, lasts forever!
Scorpion8 is offline  
Old July 17, 2012, 06:56 PM   #3
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FU-BUS are so cheap these days, you can have one on the gun and a back-up for your back-up in your pocket.
You wank the (presumed metal) one that's integral to the gas block... it's wanked, unless you have an FU-BUS on the rail too.

One of these days, someone is going to post a photo of a floating rail AR with about 15 sets of BUS installed... some on top, some offset, hell even a few on the bottom just for fun.

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Creeper is offline  
Old July 24, 2012, 11:04 PM   #4
Join Date: January 30, 2008
Location: Louisiana
Posts: 45
why not just bury the gas block and mount your front sight on a full length rail? like this:
Caliber is offline  
Old July 24, 2012, 11:05 PM   #5
Join Date: January 30, 2008
Location: Louisiana
Posts: 45
ifnot option A is the way to go, if you ever damage the front sight "doubtful" just change the sight rather than having to pull off the gas block. YHM makes a good well priced flip-up
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Old July 25, 2012, 02:35 AM   #6
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Location: Tx Panhandle Territory
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I don't know if I'm missing something, or what, but it seemed to me the obvious solution would be an adjustable gas tube and something like the YHM flip up sight.
Rednecks... Keeping the woods critter-free since March 2, 1836. (TX Independence Day)

I'm going to use the words "clip" and "Long Colt" every chance I get. It grinds my gears to see new members attacked when we all know dang good and well what's being refered to.
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