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Posted: 7/27/2012 5:20:35 PM EDT
Does anyone know if anyone make quality polygonal rifled barrels? I know Noveske say polygonal rifling but the barrels aren't true polygonal barrels but rather the grooves for the rifling are polygonal in shape. Thanks
Link Posted: 7/27/2012 5:25:26 PM EDT
Makes it really hard to use a gas block. I've seen a one in a magazine before, but it was round from the FSB forward.
Link Posted: 7/27/2012 5:38:38 PM EDT
I believe ARP offers polygonol barrels - 16" barrel listed as : ––1 in 8 " twist 5R rifling- .700" UTG, .750 GB, .700 muzzle

http://www.ar15performance.com/5_56_223

Is this what you mean? The 5R I believe is.
Link Posted: 7/27/2012 5:43:37 PM EDT
Originally Posted By Dodge223:
Makes it really hard to use a gas block. I've seen a one in a magazine before, but it was round from the FSB forward.


Polygonal rifling refers to the inside of the barrel, not the outside.
Link Posted: 7/27/2012 5:48:18 PM EDT
Link Posted: 7/27/2012 5:53:32 PM EDT
Originally Posted By Medicfrost:
Originally Posted By Dodge223:
Makes it really hard to use a gas block. I've seen a one in a magazine before, but it was round from the FSB forward.


Polygonal rifling refers to the inside of the barrel, not the outside.


I guess I miss understood the OP's post then.
Link Posted: 7/27/2012 6:12:23 PM EDT
Originally Posted By ricochet7:
I believe ARP offers polygonol barrels - 16" barrel listed as : ––1 in 8 " twist 5R rifling- .700" UTG, .750 GB, .700 muzzle

http://www.ar15performance.com/5_56_223

Is this what you mean? The 5R I believe is.

I don't think that this is polygonal.
5R is more closely related to conventional rifling.

Polygonal is a different animal.
Black Hole and Noveske use it.
Link Posted: 7/27/2012 6:17:16 PM EDT
[Last Edit: 7/27/2012 6:30:14 PM EDT by JmPnTX]
Originally Posted By ICON_636:
http://blackholeweaponry.com/


BHW.



How does your rifling work?

The shape of the lands and grooves are based on a circle, so there are no sharp corners or edges for the bullet to conform into. This means there is a tight seal and thus less bullet deformation. This rifling form is unique in its ability to allow the bullet to be centered and fully supported by the barrel’s bore.


Read more: http://www.blackholeweaponry.proboards.com/index.cgi?board=faq&action=display&thread=57#ixzz21sbXi8rn


Noveske is a little closer to a conventional type rifling but with the sharp edges of the lands being gently ramped down instead... But do they ever make some sweet accurate barrels!

From a Molon review, http://www.ar15.com/forums/t_3_118/467919_.html


Link Posted: 7/27/2012 6:49:49 PM EDT
[Last Edit: 7/28/2012 6:58:32 AM EDT by ricochet7]
Originally Posted By Direct-Drive:
Originally Posted By ricochet7:
I believe ARP offers polygonol barrels - 16" barrel listed as : ––1 in 8 " twist 5R rifling- .700" UTG, .750 GB, .700 muzzle

http://www.ar15performance.com/5_56_223

Is this what you mean? The 5R I believe is.

I don't think that this is polygonal.
5R is more closely related to conventional rifling.

Polygonal is a different animal.
Black Hole and Noveske use it.


My bad, I live and learn. Am looking at a 5R in 6.8 for my next build, was thinking wrong Not my first mistake Nor my last
++ And I even have a Noveske N4 with polygonal rifling, duh!! I get confused being dyslexic
Damned, I read Molon's article wrong, mistook his N4 info- surgery, Morphine and keyboards are a bad mix, I guess...
Link Posted: 7/27/2012 7:25:24 PM EDT
Black Rain Ordnance!
Link Posted: 7/27/2012 8:07:34 PM EDT
Originally Posted By ICON_636:
http://blackholeweaponry.com/


This

Link Posted: 7/27/2012 10:56:17 PM EDT
Lothar Walther
Link Posted: 7/27/2012 11:29:44 PM EDT
That's my lothar walther
Link Posted: 7/28/2012 1:04:50 AM EDT
[Last Edit: 7/28/2012 1:06:55 AM EDT by Gamma762]
The PacNor/Noveske "7P", Lothar Walther, Shilen's "ratchet rifling" and the various 5R types are all a similar concept of modified lands of rifling.
Link Posted: 7/28/2012 5:50:06 AM EDT
Originally Posted By ricochet7:
Originally Posted By Direct-Drive:
Originally Posted By ricochet7:
I believe ARP offers polygonol barrels - 16" barrel listed as : ––1 in 8 " twist 5R rifling- .700" UTG, .750 GB, .700 muzzle

http://www.ar15performance.com/5_56_223

Is this what you mean? The 5R I believe is.

I don't think that this is polygonal.
5R is more closely related to conventional rifling.

Polygonal is a different animal.
Black Hole and Noveske use it.


My bad, I live and learn. Am looking at a 5R in 6.8 for my next build, was thinking wrong Not my first mistake Nor my last
++ And I even have a Noveske N4 with polygonal rifling, duh!! I get confused being dyslexic


N4 barrels are not polygonal to my knowledge....only noveske SS barrels get the poly treatment.
Link Posted: 7/28/2012 5:58:04 AM EDT
[Last Edit: 7/28/2012 6:03:15 AM EDT by Humbarger]
Lothar Walther makes excellent polygon rifled barrels.

http://www.lothar-walther.com/380.php

BTW the Japanese were useing polygon or (orb) as they called it in their Arisakas & MGs
in WWII because of the harsh jungle enviroments that the rifles were used in.
Those bores are also chrome plated.
Link Posted: 7/28/2012 6:25:33 AM EDT
I have a BHW 18" SS rifle gas barrel coming in next week for a SPR build that I'm working on. I have read good things about then and got it cheap from surplusammo.com
Link Posted: 7/28/2012 5:17:29 PM EDT
Originally Posted By Dodge223:
Makes it really hard to use a gas block. I've seen a one in a magazine before, but it was round from the FSB forward.


The inside is polygonal and the outside is round... like glock barrels. Definitely don't want my rifle to look like some winchester 1873/AR hybrid.
Link Posted: 7/28/2012 5:19:14 PM EDT
Originally Posted By ricochet7:
I believe ARP offers polygonol barrels - 16" barrel listed as : ––1 in 8 " twist 5R rifling- .700" UTG, .750 GB, .700 muzzle

http://www.ar15performance.com/5_56_223

Is this what you mean? The 5R I believe is.


Not what I am looking at... thats not true polygonal. I am looking for something without lands and grooves
Link Posted: 7/28/2012 5:27:37 PM EDT
[Last Edit: 7/28/2012 5:37:59 PM EDT by JmPnTX]
Black Hole Weaponry barrels in stock at Surplus Arms. $229

rifle length (and they also have mid-length in stock)
http://www.surplusammo.com/blackhole-weaponry-ar-15-18-rifle-length-stainless-steel-5-56-1-8-poly-barrel/

And they have a deal for a free stripped upper with purchase of a BHW barrel...
Link Posted: 7/28/2012 5:47:07 PM EDT
Originally Posted By JmPnTX:
Black Hole Weaponry barrels in stock at Surplus Arms. $229

rifle length (and they also have mid-length in stock)
http://www.surplusammo.com/blackhole-weaponry-ar-15-18-rifle-length-stainless-steel-5-56-1-8-poly-barrel/

And they have a deal for a free stripped upper with purchase of a BHW barrel...


This is exactly what I bought...
Link Posted: 7/29/2012 6:36:26 AM EDT
great, now i found something else i want.
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