AR Barrel question


PDA






DeepSouth
July 16, 2010, 02:33 PM
A good friend of mine called me up yesterday and told me he had been talking to someone and they told him they had just received a new barrel for their AR. Is is known to be a "tack driver," but he said it is "Smooth Bore". My friend was wondering if he had missed some kind of new technology. The only thing I could think of was possibly some kind of Polygonal rifling that he had looked down and thought it was smooth bore, but my buddy said he was very specific......Smooth Bore.

So I come here to the AR experts asking if there is a such thing as a "tack driving smooth bore barrel" for an AR. I've never heard of such, my BS meter is pretty much pegged out, but I suppose you never know. So I am here asking what I think is a stupid question.

If you enjoyed reading about "AR Barrel question" here in TheHighRoad.org archive, you'll LOVE our community. Come join TheHighRoad.org today for the full version!
Bullnettles
July 16, 2010, 02:34 PM
Sounds like they bought a blank... I've never heard of a non-spinning bullet being too accurate :D

DeepSouth
July 16, 2010, 03:11 PM
"I've never heard of a non-spinning bullet being too accurate"



My thoughts exactly.

cbrgator
July 16, 2010, 03:16 PM
Maybe they meant the OUTSIDE of the barrel was smooth? :)

Otherwise my BS-o-meter is in tune with yours.

rcmodel
July 16, 2010, 03:19 PM
Maybe he meant to say the bore & rifling is really smooth.
As in hand-lapped to perfection with diamond polishing compound.

There is no such thing as a smoothbore AR-15 barrel.
And if there were, you couldn't hit diddly squat with it, as the bullets would start tumbling as soon as they exited the muzzle.

rc

gb0399
July 16, 2010, 03:34 PM
smooth barrel pistols are NFA items aren't they? would a rifle also be?

Also, the Abrams has a smooth bore, how do its rounds stabilize?

rcmodel
July 16, 2010, 03:38 PM
No, a smoothbore rifle with a barrel longer then 18" & 26" OAL would be a shotgun.
Less then 18" barrel or 26" OAL would make it an NFA item.

rc

gb0399
July 16, 2010, 03:44 PM
Nothing like a 5.56 semiauto magazine fed, shotgun

cougar1717
July 16, 2010, 05:42 PM
Someone makes a .410 shotshell upper for an AR. Not sure if it's smooth bore or not. Could this be what the friend is talking about and just being funny about it being a tack driver?

DeepSouth
July 17, 2010, 05:38 AM
Thanks for confirming my BS meter, I didn't have much doubt but had to ask just in case.

Taurus 617 CCW
July 17, 2010, 12:30 PM
There is no such thing as a smoothbore AR-15 barrel.

We got one of these in the shop last year and the guy said it wouldn't hold a group past 50 yards using match grade .223. I looked at the target provided and there was a beautiful 5" key hole shot group (bullets smacked the paper going sideways instead of straight). :confused:

I looked down the barrel and sure enough, there was no rifling. I was not able to get in contact with the company that made the barrel since they didn't have a phone number on their site and would not return emails. They are not a reputable company (black)+(thorn). We fixed the problem with a quality M-4 barrel that actually had rifling. :banghead:

strambo
July 17, 2010, 12:42 PM
Duh, that was their home defense model...heard about all those reports of pesky bullets in combat failing to fragment from the M4? Well, all bullets from this model are guaranteed to tumble at any range or velocity!

4thPointOfContact
July 17, 2010, 02:37 PM
Also, the Abrams has a smooth bore, how do its rounds stabilize?

The Abrams has the advantage of having Armor-Piercing Fin-Stabilized Discarding Sabot (APFSDS) rounds. Very essentially, steel arrows.
http://www.globalsecurity.org/military/systems/munitions/images/mk258-30mm-amp-image16.jpg

benEzra
July 17, 2010, 07:50 PM
Here's a pic after shedding the sabot (this one is a 120mm, the one above looks like a smaller caliber?)

http://www.tonyrogers.com/images/weapons/sabot_120mm.jpg
http://www.tonyrogers.com/weapons/m829_120mm.htm

DirtyHarry31
July 17, 2010, 08:43 PM
If he says it's a smooth bore it could be a Noveske Stainless Polygon rifled barrel. It looks smooth but if look hard you can almost see the ploygon shape in the bore. H&K has done this with pistols as well as Glock. So for the BS meter if it's not a Noveske barrel then your correct unless another company makes them. Here's your proof of a "smooth bore"?
http://www.gunbroker.com/Auction/ViewItem.aspx?Item=179129725
http://www.gunbroker.com/Auction/ViewItem.aspx?Item=179492041
http://www.gunbroker.com/Auction/ViewItem.aspx?Item=179491858
I own a Noveske Reece Light Midlength and let me tell you it is everything it says it is. Dead accurate straight out of the box. But to my knowledge they only do the polygon rifling with stainless, but I could be wrong.

M1key
July 18, 2010, 01:00 AM
^^^

Polygonal...

Black Hole Weaponry and others make them.

If you enjoyed reading about "AR Barrel question" here in TheHighRoad.org archive, you'll LOVE our community. Come join TheHighRoad.org today for the full version!