another 7.5 ar question

crazy_arctic_hero

crazy_arctic_hero

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I know i can get a 7.5 inch ar15 barrel made for a couple of machinists/gunsmiths, if not, I can get a barrel cut (which have its own respective problems, i.e. might need a new gas port).
But my question is; would i need a special gas tube for it? If so, what kind and where can i get one? I've seen a couple of AR's that claim to have a pistol length gas system, would i need something like that?

FYI, I'm a ar15 newbie.... so please be gentle :runaway:
 
they tend to keyhole at 50 yards. 1/7 is highly recommended... 1/8 is borderline. The gas port will have to be redrilled as it is a different diameter than normal. It is of course easyer to cut a stainless than a clomed lined barrel.
 
I would love a Noveske barrel but the closet retailer who sells them is Socom Supply and I thought they only sold the uppers (which their out of).
Keyhole? What does this mean?
 
crazy_arctic_hero said:
I would love a Noveske barrel but the closet retailer who sells them is Socom Supply and I thought they only sold the uppers (which their out of).
Keyhole? What does this mean?
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where the bullet woud hit the target sideways instead of straitforward. The bullet looses it's flight stability and tumbles in the air. The 7.5 inch 1/9 twist does not have anought time to stabelise the bullet
 
Paulinski said:
More info here
Click to expand...
All i see is ass kissing and Tags..what page?
And if you are under the impression that they should perform like a 20",then you are out to lunch.
It's a pistol lenght barrel,you can only expect it to perform at pistol ranges..

A 7.5" AR is just an smg with AP capabilities,not a target rifle.
 
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in a 7.5 inch barrel with a 1/9 twist, the bullet won't even make a complete turn before leaving the barrel. with a 1/7, at least it will make an almost complete spin before leaving.
 
Paulinski said:
Nevermind - ignore that link. Build one with Wilson 7.5" barrel. It will work great.:rolleyes:
Click to expand...

Now you tell me........ I did actually read those 7 pages of hearing how AWESOME THE NOVESKE UPPER AND HOW IT REQUIRES EVERY LETTER OF MY SETENCE TO BE CAPITALIZED.
Sorry, i just find it annoying when that guy WES GRANT can't turn off his caps lock when making a post... (ending rant now).
 
I'm not gonna try to deny that the MSTN/Noveske is kickass but that doesn't tell me anything about the performance of a 1:9 twist.
People on this forum speak that the RRA .223 pistol was good and that was a 1:9 twist barrel.
 
KAKO bring a novesky upper I'll cut my 1/8 twist armalite barrel. Anyone willing to donate a 1/9 barrel (any lenght I do the smitting myself) and we will do a range test on all 3 barrels? test using 55g and 62g sitting on a bench at 50 and 100 yards
 
kako911 said:
With the MSTN/Noveske setup.

Its SUB Moa @ 100 M That is a 1/7 twist...
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If that's the case than why does Wes state that the bullet doesn't complete a full revolution before leaving the barrel?

I too find it annoying when dealers in Arfcom leave the caps lock on. It's considered rude "shouting" when we do it, but it seems to be a "right" the dealers have. Hell, Larue does bold caps locks in everypost.

To answer some other questions;

7.5" barrels use a "pistol length" gas tube. You can probably cut down any gas tube, but their are some made for this purpose.

You will have to drill a new gas port due to the shortness of the barrel. It's location and size are best left to a pro who's done it numerous times.
 
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