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Old January 29, 2019, 05:38 PM   #1
WheelGunRealGun
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Mid Length Handguard on Carbine Gas AR15?

I'm wanting to put a Daniel Defense Omega 9.0 Quad Rail on a Colt 6920 OEM 2 (the one with the low profile gas block). I see that Daniel Defense says the 9" Omega was meant for midlength. Could I run into any problems putting it on a carbine length w/ a low-pro gas block? Such as the gas block hitting the rail during firing or something? Has anyone done this?

Basically I want to get a rail that completely covers the low-pro gas block so it's not just sitting there outside the end of the rail looking silly.
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Old January 29, 2019, 06:46 PM   #2
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"Such as the gas block hitting the rail during firing or something?"

That will NOT happen unless something comes loose. Depending on how the FF attaches, it may or may not be possible to install the handguard over an already in place gas block and tube.
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Old January 29, 2019, 07:17 PM   #3
sevt_chevelle
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All my rails, bcm and Midwest extend past over the gas block no problem.
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Old January 29, 2019, 07:41 PM   #4
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I cover nearly all of my gas blocks (FF tube extends over the GB).

Some combinations of gas block and free float tube will have interference issues. I don't know anything about the DD Omega, or what the factory Colt GB dimensions are. So, I can't offer advice on that specific combination.

But when I run into problems, I turn to the Troy low profile gas blocks. They'll fit inside almost anything - including the .875" version inside Midwest Industries SSK (super slim) free float tubes.

Just make sure you have at least 0.050" or so clearance around the GB, and it should be fine.
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Old January 31, 2019, 02:08 AM   #5
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The only gas blocks I see issues with are the type with a rail on top. If you get a low-profile gas block, I have never seen one interfere with even the smallest diameter fore end rail. Of course, I only see a couple dozen or so a month.
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Old January 31, 2019, 02:28 AM   #6
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You may have a timing issue since it is made for a mid length instead of a carbine length rifle. The problem will be with the dwell time which could cause jams and cycling issues.
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Old January 31, 2019, 07:10 AM   #7
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"You may have a timing issue since it is made for a mid length instead of a carbine length rifle. The problem will be with the dwell time which could cause jams and cycling issues."

OP is asking about putting a mid-length hand guard over the carbine length gasblock.
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Old January 31, 2019, 11:44 AM   #8
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I personally prefer my gas blocks to be right at the end of the rail.
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Old January 31, 2019, 12:58 PM   #9
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Quote:
The only gas blocks I see issues with are the type with a rail on top. If you get a low-profile gas block, I have never seen one interfere with even the smallest diameter fore end rail. Of course, I only see a couple dozen or so a month.
Midwest Industries SSK and SSM (now "Slim Line"?) tubes interfere with most set-screw gas blocks on the market, and I am not aware of a single clamp-on gas block that will fit. (There probably is at least one. I just haven't seen one that works.)
I've also seen or read of issues arising with AR Stoner, Leapers, Classic Firearms, GunTec, AimSports, and more free float tubes. -Generally cheap stuff, or Chinese knock-offs of the MI SSK/SSM series.

Contact is almost universally at the bottom of the gas block, on the set screw boss.
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Old February 1, 2019, 09:18 PM   #10
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I have carbine and midlength gas rifles with 12.5. 13.5 and 15 inch long free float handguard. As long as the handguard clears the low profile gas block with no interference, you can run any length you want.
Next...have you shot a rifle with quad rail before? They're often sharp edges and like trying to hang onto a cheese grater.
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Old February 2, 2019, 07:21 AM   #11
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"They're often sharp edges and like trying to hang onto a cheese grater."

+1 on that. The only way to actually USE the "railed HG" is to wrap it with "vet wrap" which then gets sticky or full of sand, dirt, or ??
Those "rails" also eat up any piece of equipment they lay against while being hauled/carried.
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Old February 2, 2019, 09:36 AM   #12
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cheap plastic/rubber rail covers also can do the job.
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Old February 4, 2019, 06:55 PM   #13
WheelGunRealGun
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Quote:
Next...have you shot a rifle with quad rail before? They're often sharp edges and like trying to hang onto a cheese grater.
Yes, I have for years. To be honest I don't buy into the current fad of ultralight and thin tubes with attachment slots. I have never experienced discomfort with a quad rail, especially with rail covers. I also prefer the looks, though that's a secondary factor.

To each their own, it's just not for me.
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