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Basic
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Posted: 8/3/2013 4:04:15 PM EST
I bought a DD 14.5" barrel and a 2.0 Battle Comp, I know I need to get these pinned and welded but wanted to know if this combination will be the legal 16" length.

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Link Posted: 8/3/2013 4:12:41 PM EST
if i'm correct, it's longer than the 1.5, which would have made it legal.

the 1.5 also has a pre-drilled hole, but who the hell needs that LOL. nothing a drill can't fix.

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Link Posted: 8/3/2013 4:24:04 PM EST
Well that's why I bought the 2.0 it measures 1 3/4" just to be sure. Thing is I actually took them to do the pin and weld and the gunsmith says its a 1/2" short of 16".

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Link Posted: 8/3/2013 4:27:00 PM EST
Did the smith measure with the bolt in battery, or measured the overall length, including the barrel extension?

The only measure that counts is with the bolt in battery, and the measuring stick against the bolt face.
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Link Posted: 8/3/2013 4:27:32 PM EST
I just looked at the site, and I might be wrong. the 2.0 DOES look shorter than the 1.5.

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Link Posted: 8/3/2013 4:34:15 PM EST
Just went to the website. 2.0 is pretty much the 1.0 but compatible with suppressors. You need the 1.5. I'm sure someone will take that 2.0 off your hands.

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Link Posted: 8/3/2013 4:37:30 PM EST
He didn't measure with the bolt in place. He attached the barrel to the upper, put my rail on and screwed on the comp and measured from where the upper and rail meet to the end of the comp and measured 15.5".

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Link Posted: 8/3/2013 4:41:29 PM EST
[Last Edit: 8/3/2013 5:01:48 PM EST by rawmade]
Thats not how it works. 16" barrels dont even measure 16" from the receiver. You measure from the extension.
Edit: i thought the 2.0 was long enough but guess its not? Its the same length as a A2 so it would be too short I guess.
Apparently with the 2.0 you will sit 0.20" short

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Link Posted: 8/3/2013 5:04:03 PM EST
So you think 1.5 will give me the extra length I need.

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Link Posted: 8/3/2013 5:11:56 PM EST
[Last Edit: 8/3/2013 5:15:02 PM EST by Redtazdog]
If your barrel is exact 14.5 and has .600 length threads and the flash hider is 2.0 then you will end up with a 15.9 OAL
and if you add a crush washer you may be at 16.0
A muzzle devise takes away some length when threaded on.
With the bolt group in drop a cleaning rod in the barrel until its against the bolt face, mark the rod with tape at the crown of the barrel, pull it
out and measure the length.

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Link Posted: 8/3/2013 5:14:05 PM EST
I know it will.. I have the 1.5 on my 14.5 dd barrel
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Link Posted: 8/3/2013 5:15:51 PM EST
I have a 14.5 BCM upper with a pinned and welded BattleComp 1.5 on it. I have measured it to be 16".

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Link Posted: 8/3/2013 5:16:27 PM EST
The 1.5 is the one you need.

Battlecomp 1.5
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Link Posted: 8/3/2013 5:18:47 PM EST
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Originally Posted By WitchDr:
I know it will.. I have the 1.5 on my 14.5 dd barrel
View Quote

Your 14.5 barrel must be longer than you think.
A 14.5 barrel and a 1.5 muzzle devise will not make a 16.0 oal as the devise threads over .600 of the barrel so you end up with
15.4 oal and 15.5 with a crush washer.

Ramblin' on my mind ;)
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Link Posted: 8/3/2013 5:19:25 PM EST
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By SHD:
Did the smith measure with the bolt in battery, or measured the overall length, including the barrel extension?

The only measure that counts is with the bolt in battery, and the measuring stick against the bolt face.
View Quote

Interesting, I did not know that (makes complete sense though). Do you have a link to something official showing that to be the prescribed method? I'd love to have that as a reference source.
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Link Posted: 8/3/2013 5:22:42 PM EST
[Last Edit: 8/3/2013 5:23:52 PM EST by TBoneDetroit]
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By Redtazdog:

Your 14.5 barrel must be longer than you think.
A 14.5 barrel and a 1.5 muzzle devise will not make a 16.0 oal as the devise threads over .600 of the barrel so you end up with
15.4 oal and 15.5 with a crush washer.
View Quote View All Quotes
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Originally Posted By Redtazdog:
Originally Posted By WitchDr:
I know it will.. I have the 1.5 on my 14.5 dd barrel

Your 14.5 barrel must be longer than you think.
A 14.5 barrel and a 1.5 muzzle devise will not make a 16.0 oal as the devise threads over .600 of the barrel so you end up with
15.4 oal and 15.5 with a crush washer.

Seems the "1.5" name refers to usable or "net" length. From the description
The BC1.5 has the same performance as the BC1.0, but the BC1.5 has been extended and pre-drilled for permanent attachment to 14.5" barrels needing 16.1" overall length.
T Bone (Detroit).
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Link Posted: 8/3/2013 5:23:03 PM EST
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Originally Posted By TBoneDetroit:

Interesting, I did not know that (makes complete sense though). Do you have a link to something official showing that to be the prescribed method? I'd love to have that as a reference source.
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Originally Posted By TBoneDetroit:
Originally Posted By SHD:
Did the smith measure with the bolt in battery, or measured the overall length, including the barrel extension?

The only measure that counts is with the bolt in battery, and the measuring stick against the bolt face.

Interesting, I did not know that (makes complete sense though). Do you have a link to something official showing that to be the prescribed method? I'd love to have that as a reference source.

ATF made this rule and its the true way to get the length.

Ramblin' on my mind ;)
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Link Posted: 8/3/2013 5:26:22 PM EST
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Originally Posted By Redtazdog:

ATF made this rule and its the true way to get the length.
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Originally Posted By Redtazdog:
Originally Posted By TBoneDetroit:
Originally Posted By SHD:
Did the smith measure with the bolt in battery, or measured the overall length, including the barrel extension?

The only measure that counts is with the bolt in battery, and the measuring stick against the bolt face.

Interesting, I did not know that (makes complete sense though). Do you have a link to something official showing that to be the prescribed method? I'd love to have that as a reference source.

ATF made this rule and its the true way to get the length.

I believe you, was just hoping you had a link to that information on their site or some other official site. Makes it easier to quote than saying "I heard it from some guy on the internet". No offense intended, I don't doubt your facts, just looking for a quotable source to show others in the future (off to search the ATF site for the info now).
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Link Posted: 8/3/2013 5:26:59 PM EST
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Originally Posted By TBoneDetroit:

Seems the "1.5" name refers to usable or "net" length. From the description
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Originally Posted By TBoneDetroit:
Originally Posted By Redtazdog:
Originally Posted By WitchDr:
I know it will.. I have the 1.5 on my 14.5 dd barrel

Your 14.5 barrel must be longer than you think.
A 14.5 barrel and a 1.5 muzzle devise will not make a 16.0 oal as the devise threads over .600 of the barrel so you end up with
15.4 oal and 15.5 with a crush washer.

Seems the "1.5" name refers to usable or "net" length. From the description
The BC1.5 has the same performance as the BC1.0, but the BC1.5 has been extended and pre-drilled for permanent attachment to 14.5" barrels needing 16.1" overall length.

I see as the true oal of the BC1.5 is probably 2.1 or longer and they call it what it adds to a barrel instead of the real oal.

Ramblin' on my mind ;)
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Link Posted: 8/3/2013 5:29:45 PM EST
[Last Edit: 8/3/2013 5:39:05 PM EST by TBoneDetroit]
Originally Posted By Redtazdog:
Originally Posted By TBoneDetroit:
Originally Posted By SHD:
Did the smith measure with the bolt in battery, or measured the overall length, including the barrel extension?

The only measure that counts is with the bolt in battery, and the measuring stick against the bolt face.
View Quote

Interesting, I did not know that (makes complete sense though). Do you have a link to something official showing that to be the prescribed method? I'd love to have that as a reference source.
View Quote

ATF made this rule and its the true way to get the length.
View Quote




And easier than I expected, here is the BATF page backing what you said (and Thank You again for the info!).
BATF Barrel measurement procedure
T Bone (Detroit).
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Link Posted: 8/3/2013 5:45:10 PM EST
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Originally Posted By TBoneDetroit:




And easier than I expected, here is the BATF page backing what you said (and Thank You again for the info!).
BATF Barrel measurement procedure
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Originally Posted By TBoneDetroit:
Originally Posted By Redtazdog:
Originally Posted By TBoneDetroit:
Originally Posted By SHD:
Did the smith measure with the bolt in battery, or measured the overall length, including the barrel extension?

The only measure that counts is with the bolt in battery, and the measuring stick against the bolt face.

Interesting, I did not know that (makes complete sense though). Do you have a link to something official showing that to be the prescribed method? I'd love to have that as a reference source.

ATF made this rule and its the true way to get the length.




And easier than I expected, here is the BATF page backing what you said (and Thank You again for the info!).
BATF Barrel measurement procedure


You are faster on the web seach than me
Since I make many barrels and some integral suppressed I know many of the atf rules + it helps to have the fed regs and state regs books at home.

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Link Posted: 8/3/2013 5:45:34 PM EST
Great responses and information. Exactly what I was expecting from a great forum. Thanks again to everyone.

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Link Posted: 8/3/2013 6:12:00 PM EST
[Last Edit: 8/3/2013 6:14:34 PM EST by rawmade]
Edit: sorry misread, thought he was saying a BC 1.5 wouldnt make a 14.5 legal, realized he meant a 1.5" MUzzle device.

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Link Posted: 8/3/2013 6:35:31 PM EST
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By Redtazdog:

Your 14.5 barrel must be longer than you think.
A 14.5 barrel and a 1.5 muzzle devise will not make a 16.0 oal as the devise threads over .600 of the barrel so you end up with
15.4 oal and 15.5 with a crush washer.
View Quote View All Quotes
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Discussion ForumsJump to Quoted PostQuote History
Originally Posted By Redtazdog:
Originally Posted By WitchDr:
I know it will.. I have the 1.5 on my 14.5 dd barrel

Your 14.5 barrel must be longer than you think.
A 14.5 barrel and a 1.5 muzzle devise will not make a 16.0 oal as the devise threads over .600 of the barrel so you end up with
15.4 oal and 15.5 with a crush washer.



:) This is straight from BCM's web site sir :

The BattleComp 1.5 in Black Oxide will fit all barrels with 1/2 x 28 RH standard threads.

The BC1.5 has the same performance as the BC1.0, but the BC1.5 has been extended and pre-drilled for permanent attachment on 14.5" barrels needing 16.1" overall length.


One of the reasons I went with their comp mod 1..

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Link Posted: 8/3/2013 6:53:01 PM EST
[Last Edit: 8/3/2013 7:09:09 PM EST by WitchDr]
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By Redtazdog:

Your 14.5 barrel must be longer than you think.
A 14.5 barrel and a 1.5 muzzle devise will not make a 16.0 oal as the devise threads over .600 of the barrel so you end up with
15.4 oal and 15.5 with a crush washer.
View Quote View All Quotes
View All Quotes
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By Redtazdog:
Originally Posted By WitchDr:
I know it will.. I have the 1.5 on my 14.5 dd barrel

Your 14.5 barrel must be longer than you think.
A 14.5 barrel and a 1.5 muzzle devise will not make a 16.0 oal as the devise threads over .600 of the barrel so you end up with
15.4 oal and 15.5 with a crush washer.



BC 1.5 is the model number..it actually measures just over two inches
I love hot dogs!
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Link Posted: 8/3/2013 6:55:01 PM EST
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Originally Posted By FargoZ71:



:) This is straight from BCM's web site sir :

The BattleComp 1.5 in Black Oxide will fit all barrels with 1/2 x 28 RH standard threads.

The BC1.5 has the same performance as the BC1.0, but the BC1.5 has been extended and pre-drilled for permanent attachment on 14.5" barrels needing 16.1" overall length.


One of the reasons I went with their comp mod 1..
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Originally Posted By FargoZ71:
Originally Posted By Redtazdog:
Originally Posted By WitchDr:
I know it will.. I have the 1.5 on my 14.5 dd barrel

Your 14.5 barrel must be longer than you think.
A 14.5 barrel and a 1.5 muzzle devise will not make a 16.0 oal as the devise threads over .600 of the barrel so you end up with
15.4 oal and 15.5 with a crush washer.



:) This is straight from BCM's web site sir :

The BattleComp 1.5 in Black Oxide will fit all barrels with 1/2 x 28 RH standard threads.

The BC1.5 has the same performance as the BC1.0, but the BC1.5 has been extended and pre-drilled for permanent attachment on 14.5" barrels needing 16.1" overall length.


One of the reasons I went with their comp mod 1..


My reply was similar, but I realized he was talking about 1.5" long devices in general, not the BC 2.0, which is like 2" long.

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Link Posted: 8/3/2013 7:24:01 PM EST
The BC 2.0 I purchased is actually 1.75" long.

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Link Posted: 8/3/2013 7:34:27 PM EST
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Originally Posted By Socram420:
The BC 2.0 I purchased is actually 1.75" long.
View Quote


Yup, the 1.0 and 2.0 are 1.75", which keeps it under 16", as they retain A2 dimensions. With the threads it puts them under 1.5" added to the OAL.

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Link Posted: 8/3/2013 7:48:46 PM EST
[Last Edit: 8/3/2013 8:08:56 PM EST by AR-4C]
I blind pinned a B.E. Meyers 249F on a 14.5" Cross Machine Tool M4 barrel (it originally was a 16" M4 barrel I had them cut to 14.5") that actually measured an over-all length of 14.625". I'm guessing the barrel manufacturer wanted to give an extra 1/8th inch leeway to guarantee the barrel would meet the 16" rifle barrel length minimum. The 249F measures an OAL of 2.75", and the included washer measured (0.125)

Using a dowel rod on a closed bolt (you can take the bcg's bolt and place it in the barrel's, barrel extension, just make sure the bolts in battery when taking the measurment;) place the dowel down the barrel from the muzzle to the bolt that's still in battery, then mark with a piece of tape where the dowel meets just outside the barrel and just past the barrel crown. See what the dowel measures to; this is your barrel OAL without a muzzle device.

Next measure what the length of the threads are that are used to make up your threaded muzzle (this measurement will be subtracted); measure the thickness of the flash hiders washer; and the OAL of the flash hider your using.

Start with the OAL of the barrel without a flash hider (+) the thickness of your washer (+) the OAL of your flash hider; add it all up and then subtract this measurement you end up with from measurement for the length of the threads that make-up your threaded muzzle. This will be the OAL length of your barrel with a permanently affixed muzzle device.

You can place the dowel down your barrel after installing the muzzle device; from muzzle to a bolt that's in battery; and the two measurements should equal out each other.

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