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Basic
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Posted: 2/20/2014 8:37:20 PM EST
Gonna convert a 16" Colt 1x7 Barrel to a 13" to get a total overall length of 16". How bad will it affect accuracy or operation? Any suggestions?

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Link Posted: 2/20/2014 8:39:11 PM EST
There are some great 13.7" barrels out there right now. Why not just swap the barrel?

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Link Posted: 2/20/2014 8:39:46 PM EST
What are you using to get the OAL with a 13" barrel?

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Link Posted: 2/20/2014 8:41:52 PM EST
Going to use a Troy Mideivel

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Link Posted: 2/20/2014 8:44:13 PM EST
[Last Edit: 2/20/2014 8:48:09 PM EST by NorthPolar]
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By Sal08360:
Going to use a Troy Mideivel
View Quote


WRONG! You will end up at 15.2" approx.
Now if you do a 13.7 you will be insanely close, but I'd personally do a 14.5 mid gas and be 100%

Per the Troy Website:
https://troyind.com/products/medieval-flash-suppressor-556

Technical Specifications

Threaded for all M16/AR15/M4 rifles and carbines.
5.56/.223 (1/2 x 28 TPI) 2.25" OAL).
Heat-treated ordnance steel construction.
Fits M14/M1A including SOCOM-16. 3.25" OAL.
Accepts USGI sound suppressor.

EDIT: I have no idea why there is the M14/M1A info lower down in there. This was specifically pulled from the 5.56 medieval page *shrug*

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Link Posted: 2/20/2014 8:44:19 PM EST
Mine is cerakoted. Rather not have extra parts laying around for a rifle I may never build

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Link Posted: 2/20/2014 8:44:19 PM EST
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By Sal08360:
Going to use a Troy Mideivel
View Quote


If it is extended length, you will need 14.5, or 14.7 for standard length.

You will need an SBR stamp under 16 OAL

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Link Posted: 2/20/2014 8:47:51 PM EST
Site lists as having a oal of 3.25. Not important, whatever it will take to get it to exactly 16"

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Link Posted: 2/20/2014 8:48:42 PM EST
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By NorthPolar:


WRONG! You will end up at 15.2" approx.
Now if you do a 13.7 you will be insanely close, but I'd personally do a 14.5 mid gas and be 100%

Per the Troy Website:
https://troyind.com/products/medieval-flash-suppressor-556

Technical Specifications

Threaded for all M16/AR15/M4 rifles and carbines.
5.56/.223 (1/2 x 28 TPI) 2.25" OAL).
Heat-treated ordnance steel construction.
Fits M14/M1A including SOCOM-16. 3.25" OAL.
Accepts USGI sound suppressor.
View Quote View All Quotes
View All Quotes
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By NorthPolar:
Originally Posted By Sal08360:
Going to use a Troy Mideivel


WRONG! You will end up at 15.2" approx.
Now if you do a 13.7 you will be insanely close, but I'd personally do a 14.5 mid gas and be 100%

Per the Troy Website:
https://troyind.com/products/medieval-flash-suppressor-556

Technical Specifications

Threaded for all M16/AR15/M4 rifles and carbines.
5.56/.223 (1/2 x 28 TPI) 2.25" OAL).
Heat-treated ordnance steel construction.
Fits M14/M1A including SOCOM-16. 3.25" OAL.
Accepts USGI sound suppressor.


Yep, you have to take into account the barrel is threaded. You're taking away at least 1/4 of an inch off your muzzle device's length. 13.7 + 2.6 or more will bring you to a legal OAL.

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Link Posted: 2/20/2014 8:50:14 PM EST
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By Sal08360:
Site lists as having a oal of 3.25. Not important, whatever it will take to get it to exactly 16"
View Quote


The 5.56 is listed at 2.25" is my point. Just send it to ADCO and tell them to make it 16" with your muzzle device and don't worry about it.

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Link Posted: 2/20/2014 8:51:01 PM EST
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By JSwann:


Yep, you have to take into account the barrel is threaded. You're taking away at least 1/4 of an inch off your muzzle device's length. 13.7 + 2.6 or more will bring you to a legal OAL.
View Quote View All Quotes
View All Quotes
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By JSwann:
Originally Posted By NorthPolar:
Originally Posted By Sal08360:
Going to use a Troy Mideivel


WRONG! You will end up at 15.2" approx.
Now if you do a 13.7 you will be insanely close, but I'd personally do a 14.5 mid gas and be 100%

Per the Troy Website:
https://troyind.com/products/medieval-flash-suppressor-556

Technical Specifications

Threaded for all M16/AR15/M4 rifles and carbines.
5.56/.223 (1/2 x 28 TPI) 2.25" OAL).
Heat-treated ordnance steel construction.
Fits M14/M1A including SOCOM-16. 3.25" OAL.
Accepts USGI sound suppressor.


Yep, you have to take into account the barrel is threaded. You're taking away at least 1/4 of an inch off your muzzle device's length. 13.7 + 2.6 or more will bring you to a legal OAL.


The .30 cal is the 3.25. Check further up in the data. The 5.56 is 2.25. But yeah, not good.

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Link Posted: 2/20/2014 8:51:25 PM EST
Read the wrong spec it is 2.25". Guess that gives me my answer

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Link Posted: 2/21/2014 4:10:50 AM EST
If you are not going to SBR, what is the point in giving up the velocity in the 3" of barrel that you are cutting off? The barrel has to be 16", so it seems like you would want the shortest barrel extension possible, like an A2 FH in order to gain the most velocity you can. This comes out to approx. a 14.7" barrel which is what I did on my Colt 6721. It looks more balanced and feels more balanced too.

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Link Posted: 2/21/2014 5:19:38 AM EST
As pointed out already your going to have to subtract about a .5" from the 2.25" length as the flash hider threads onto the barrel. Most barrels are cut 1/8" over, you probably could cut down to 14 3/8" but most would encourage you to just down to 14.5". There is a significant expense here for cutting and pinning to just loose 1.5". The next problem is the Troy devices are hardened, I don't think Adco will pin them. The other issue I see is that the flash hider in question does not offer the best performance, If I was pinning something it would be a premium combo type like the battlecompe, new pwa, dynacomp, griffen, etc... also most of these are already drilled for pinning.

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