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Posted: 3/4/2015 9:01:19 PM EDT
[#1]
I'm doing the exact same thing you are and I'm looking at the same barrel also......Can't help you with the handguard length all mine are currently 20".......This will be my first 18"er......I am also looking at mating it to one of those Rainier uppers the forged mil-spec minus FA w/logo.
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Posted: 3/4/2015 10:37:45 PM EDT
[#2]
Well it's good to know that the answer to this question will benefit others as well. I guess as long as it covers the gas block on a 20 it will for the 18 too gas system should be the same?
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Posted: 3/5/2015 12:18:55 AM EDT
[#3]
if it has a rifle length gas system the gas block will be the same distance from the receiver whether the barrel is 18" or 20".
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Posted: 3/5/2015 1:07:25 AM EDT
[#4]
http://www.m4carbine.net/showthread.php?54754-Bravo-Company-MK12-SPR-Mod-3X-Bravo-short-review
This looks like a 14 will work well |
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Posted: 3/5/2015 10:54:41 AM EDT
[#5]
If you want the block fully covered, go with a 15" handguard. I have a Midwest Industries SS 12" (listed at 12.625") handguard on a rifle length gas system. The handguard ends about a 1/32" before the gas block starts. My intent was to cover 1/16" or so of the gas block. I fully speced the parts out as best I could. However, once installed, the handguard came up a bit short. The lesson here is don't cut it too close. Published specs aren't 100% accurate.
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Posted: 3/5/2015 12:23:57 PM EDT
[#6]
The longest gas block I have is 2 inches. A 14" will work.
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Posted: 3/6/2015 9:54:51 AM EDT
[#7]
14" will do it, I went with a 15" SSM from Midwest on a similar build and am pleased with the result. |
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Posted: 3/10/2015 11:51:46 PM EDT
[#8]
I'd do a 15" if I was choosing.
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Posted: 3/11/2015 1:04:34 PM EDT
[#9]
I have a 13.5 diamond head. It covers the gas block, on an 18 inch rifle gas barrel but the angle cut on the end only just barely covers the block.
On my 20 i went with a 15 inch parallax tactical rail. |
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Posted: 3/12/2015 12:49:35 PM EDT
[#10]
To completely cover the rifle length gas block you will want the 15" handguard
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Posted: 3/12/2015 3:03:20 PM EDT
[#11]
The gas port on a rifle length system is 12 inches from the extension, given that and the length of a low pro gas block (we'll call it about an inch, give or take) I'm sure anything over 13" will suffice
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Posted: 3/12/2015 3:11:19 PM EDT
[#12]
Quote HistoryQuoted:
I have a 13.5 diamond head. It covers the gas block, on an 18 inch rifle gas barrel but the angle cut on the end only just barely covers the block. On my 20 i went with a 15 inch parallax tactical rail. Do you have any pics of that 18" rifle? I'm planning an 18" rifle-length barrel on my next build, along with a DiamondHead rail, but haven't decided whether I want the 13.5" or 15" Diamondhead. Thanks. |
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Posted: 3/12/2015 3:22:29 PM EDT
[#13]
I went with a 15"
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Posted: 4/1/2015 10:34:52 AM EDT
[#14]
What is the difference between a, mid length gas system and rifle length gas system ?
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Posted: 4/1/2015 11:23:28 AM EDT
[#15]
15" Geissele SMR MKIII covers the gas block on a rifle length gas system, with about an inch to spare:
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Posted: 4/1/2015 12:04:31 PM EDT
[#16]
13" will be a little short. Here is a 12" PRI next to a 13" TRX Extreme. The actual measurement of the PRI is 12.75 and it buts up against the rear of a rifle length gas block.
  A 15" rail on the other hand will completely cover it:  If you look closely you can see the low profile gas block at the rifle position. |
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Posted: 4/1/2015 12:07:06 PM EDT
[#17]
Quote HistoryQuoted: What is the difference between a, mid length gas system and rifle length gas system ? If you look at my picture above you can see the mid length gas block underneath the 13" TRX extreme rail. |
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Posted: 4/1/2015 4:23:40 PM EDT
[#18]
I mean other than length/looks. will they shoot or cycle differently?
18" Special Purpose Rifle (SPR) Barrel, Mid-Length Gas System, Fluted Price: $335.00 18" Special Purpose Rifle (SPR) Barrel, Rifle Length Gas System, Fluted Price: $335.00 .223 Length 18" Twist 1-7 These are from, White Oak Armament. I am starting my first build. Gas Block Diameter .750" |
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Posted: 4/1/2015 6:11:22 PM EDT
[#19]
You wanna go 15" anything less and you will be unhappy with it....imo
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