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Posted: 6/10/2018 11:01:36 PM EDT
I have a 11.5 del-ton heavy barrel that has a F marked front sight base on it with a .750 Gas Block platform. I want to have Bricks xm177 flash hider and spacer installed by John Thomas. My question is should I have John replace the F marked front sight base with a non F marked base with a same .750 gas block platform? This is part of a xm177 project.
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https://imgur.com/APf8VqW https://imgur.com/MytDa0e https://imgur.com/IfJgGbe https://imgur.com/TLlCrVY not sure about posting pictures first time doing this. |
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Posted: 6/10/2018 11:18:06 PM EDT
[#1]
Do it right
Get a lightweight barrel |
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Posted: 6/11/2018 12:29:21 AM EDT
[#2]
I guess I could wait and get a 11.5 barrel from Green mountain when they become available.
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Posted: 6/11/2018 12:44:16 AM EDT
[#3]
Wait and go for a pencil barrel. I've done similar builds and I always go back and change to parts that I should've installed the first time. Which is kinda fun now that I think about it, but if you are spending money with Mr. Thomas I'd go for the pencil barrel.
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Posted: 6/11/2018 12:57:57 AM EDT
[#4]
Quote HistoryQuoted:
Do it right Get a lightweight barrel |
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Posted: 6/11/2018 1:22:53 AM EDT
[#5]
Will the Green Mountain 11.5 barrels be lightweight?
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Posted: 6/11/2018 3:14:52 AM EDT
[#6]
The 11.5 barrel will not get you to 16" with Bricks moderator. Get the 12.7" Brownells barrel and JT will chop it then pin/weld the moderator to keep your rifle at legal length. Couldn't be any happier with my setup that he did for me.
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Posted: 6/11/2018 7:27:50 AM EDT
[#7]
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Posted: 6/11/2018 8:17:09 AM EDT
[#8]
Quote HistoryQuoted:
The 11.5 barrel will not get you to 16" with Bricks moderator. Get the 12.7" Brownells barrel and JT will chop it then pin/weld the moderator to keep your rifle at legal length. Couldn't be any happier with my setup that he did for me. 11.5” barrel + 4.5” moderator = 16” right? Wrong! I didn’t compensate for the overlap of the barrel and moderator . This overlap is subtracted off the total length. I returned my 11.5” and bought the 12.7” and had John Thomas work his magic at extremely fair prices. This is mine with the moderator that John fabricates and sells. Email John, he will get back to you before you know it. I believe John is on vacation this week so he might or might not be answering emails.  Attached File Attached File Attached File |
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Posted: 6/11/2018 8:52:26 AM EDT
[#9]
Quote HistoryIf the moderator alone is 4.335" (minimum 3.715" net added length with 0.620" thread length; slightly longer if using grenade ring), the barrel as measured from the boltface needs to have a length greater than 12.285" to be NFA compliant. 12.335" should give a bit of positive clearance to bee sure its over 16" |
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Posted: 6/11/2018 2:15:03 PM EDT
[#10]
I posted pictures of the 11.5" barrel that gets it to 16.5" when assembled with Bricks new flash hider and spacer. check my original post above.
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Posted: 6/11/2018 2:36:10 PM EDT
[#11]
use the {img} tags, except use "[" instead of "{"
IMHO, That barrel is way too thick to look like an XM-177 
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Posted: 6/11/2018 2:42:00 PM EDT
[#12]
thanks for the info.
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Posted: 6/11/2018 2:51:18 PM EDT
[#13]
is this the correct Brownells barrel? https://www.brownells.com/rifle-parts/barrel-parts/rifle-barrels/ar-15-12-7-a1-carbine-barrel-1-12-assembly-prod97901.aspx
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Posted: 6/11/2018 3:16:56 PM EDT
[#14]
It’s got a slow ass twist... so if you only ever plan to shoot 55gr that will work.
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Posted: 6/11/2018 3:17:53 PM EDT
[#15]
Quote HistoryQuoted:
is this the correct Brownells barrel? https://www.brownells.com/rifle-parts/barrel-parts/rifle-barrels/ar-15-12-7-a1-carbine-barrel-1-12-assembly-prod97901.aspx |
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Posted: 6/11/2018 3:23:19 PM EDT
[#16]
Thanks very much. anyone need a Del ton barrel?
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Posted: 6/11/2018 4:39:25 PM EDT
[#17]
Quote HistoryQuoted:
Thanks very much. anyone need a Del ton barrel? it will sell |
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Posted: 6/11/2018 5:17:17 PM EDT
[#18]
I went with a BCM 11.5” enhanced light weight and a Brick extended moderator. I like the BCM because it has the better twist rate. Better twist rate for such a short barrel at least. The only down size is the BCM barrels are pricey.
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Posted: 6/11/2018 6:50:55 PM EDT
[#19]
I ordered the Brownells barrel but I may have to have build another one using the Green Mountain 12.7" barrel when they are available. This retro stuff is killing me.
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