Question about gas tub lengths??

[gunslinger2a]

New at AR builds, so keep this in mind:..I'd like to put a 5.5" muzzle brake on a 10.5" barrel, which are normally used for AR pistols. I have a low profile .750 gas block, but do I need a pistol length gas tube, or a carbine length one. Does anyone know the actual measurements of each?

Thanks

 

[01SVTvert]

Find out where the gas port is located. That determines what length the gas system will be. A ten inch barrel can use either a carbine length system or a pistol length system.
Gas tube for carbine is about 7.5 Inches. Tube for pistol is about 3 or 4 inches. This is the tube only. Not the whole system.

 

[Supermoto]

when you buy a barrel it says what gas system it needs,
why do you want a 5.5" muzzle brake?

 

[01SVTvert]

I Assume he doesn't want a SBR.

 

[Supermoto]

I Assume he doesn't want a SBR.

I guess I should have said why a 10.5 barrel and then put a huge brake on it. just get a longer barrel

 

[chinalfr]

I asked this question a few days ago. This pic will help.

Sent it from iPhone 5 LTE

 

[Another_David]

this is like the fourth gas tube question in recent memory

Here's the carbine, mid, intermediate, and rifle length. If it's shorter than these you need pistol. I would guess carbine length--pistol is super short.. Sounds like you're going to free float the handguard but if you have one, put a carbine handguard next to the barrel and see if it would fit.

http://www.northeastshooters.com/vb...059-gas-tube-length-question.html#post2910274

 

[Mike-Mike]

I guess I should have said why a 10.5 barrel and then put a huge brake on it. just get a longer barrel

Betting it's a fashion decision.

 

[gunslinger2a]

Answers: I just happen to have a 10.5" barrel (don't want to make an AR pistol/SBR) and have a chance to pick up a 5.5" muzzle brake, My motive wasn't a "fashion decision", (Sorry Mike-Mike)tho it might indeed look pretty cool. the person I got the short barrel told me it was for a pistol, so I'm assuming I'll need a pistol gas system, and probably the shortest tube. I'm hoping a free floating 7" handguard will be sufficient to end before the brake, but I guess I'll just have to get all the parts together, (barrel is at a friend's house) and measure!!
thanks for the comments guys.