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9/19/2017 7:27:10 PM
Posted: 2/20/2006 8:05:05 AM EDT
Has anyone worked out a "sweet spot" for a 6.8mm SPC chrome-lined barrel under 16"?
Link Posted: 2/20/2006 8:15:51 AM EDT
12 inch barrels work well, from what I hear.
Link Posted: 2/20/2006 10:03:52 AM EDT
I'm having one made up at 14". Would sure like to hear other's views on the subject.
Link Posted: 2/20/2006 12:50:42 PM EDT
12" works great. My next will be a 12.5" for GP use, and I'm thinking about something PDW length to play around with.

I think 12.5" will end up being a favorite 6.8 barrel length.

Link Posted: 2/20/2006 1:23:50 PM EDT
I know that 6.8 was somewhat designed for shorter barrel lengths, how much performance loss is there between, say, 16" and a 13.75"? I've been considering either a 13.75 or 14.5 with permanent muzzle device (KX3), or else a 16". Can't decide.

BTW, what's the typical thread pattern on 6.8 barrels?
Link Posted: 2/20/2006 1:45:10 PM EDT
[Last Edit: 2/20/2006 1:52:37 PM EDT by Capn_Crunch]

Originally Posted By Gamma762:
I know that 6.8 was somewhat designed for shorter barrel lengths, how much performance loss is there between, say, 16" and a 13.75"? I've been considering either a 13.75 or 14.5 with permanent muzzle device (KX3), or else a 16". Can't decide.

BTW, what's the typical thread pattern on 6.8 barrels?



1/2x28 is pretty common.

What's your intended role for this particular rifle? The frag range out of a 12" barrel with 110 VMAX is ridiculously long for that short of a barrel... Like, WAY outside of the CQB envelope.
Link Posted: 2/20/2006 2:03:06 PM EDT

Originally Posted By Capn_Crunch:

Originally Posted By Gamma762:
I know that 6.8 was somewhat designed for shorter barrel lengths, how much performance loss is there between, say, 16" and a 13.75"? I've been considering either a 13.75 or 14.5 with permanent muzzle device (KX3), or else a 16". Can't decide.

BTW, what's the typical thread pattern on 6.8 barrels?



1/2x28 is pretty common.

What's your intended role for this particular rifle? The frag range out of a 12" barrel with 110 VMAX is ridiculously long for that short of a barrel... Like, WAY outside of the CQB envelope.



Actually, Capn', the .mil specs a 5/8-24 thread, same as a 7.62N.
Link Posted: 2/20/2006 2:15:42 PM EDT
Pete, didn't know about the mil-spec. I was going by Noveske and Surefire, who're both using the 1/2x28.
Link Posted: 2/20/2006 2:42:18 PM EDT
[Last Edit: 2/20/2006 2:48:20 PM EDT by pcurtis]

Originally Posted By Capn_Crunch:
Pete, didn't know about the mil-spec. I was going by Noveske and Surefire, who're both using the 1/2x28.



The 5/8-24 thread prevents unintended consequences, like a 5.56M FS accidently used on a 6.8SPC etc. Very rude awakening to say the least. If Noveske and Surefire are doing otherwise, I'm sure the end user & armorer are aware.

ETA: To get back on topic. A 16.5" 6.8SPC is as long as you need for 0-300M. IMHO. If you are not going the SBR, then adding a permanent muzzle device to get to 16" is a waste, just go with a 16".
Link Posted: 2/20/2006 2:46:41 PM EDT

Originally Posted By pcurtis:

Originally Posted By Capn_Crunch:
Pete, didn't know about the mil-spec. I was going by Noveske and Surefire, who're both using the 1/2x28.



The 5/8-24 thread prevents unintended consequences, like a 5.56M FS accidently used on a 6.8SPC etc. Very rude awakening to say the least. If Noveske and Surefire are doing otherwise, I'm sure the end user & armorer are aware.



Understood. 115 grains at 2600 FPS impacting a 5.56 A2 FS would definately ruin one's day.
Link Posted: 2/20/2006 2:52:22 PM EDT

Originally Posted By Capn_Crunch:

Originally Posted By Gamma762:
I know that 6.8 was somewhat designed for shorter barrel lengths, how much performance loss is there between, say, 16" and a 13.75"? I've been considering either a 13.75 or 14.5 with permanent muzzle device (KX3), or else a 16". Can't decide.

BTW, what's the typical thread pattern on 6.8 barrels?



1/2x28 is pretty common.

What's your intended role for this particular rifle? The frag range out of a 12" barrel with 110 VMAX is ridiculously long for that short of a barrel... Like, WAY outside of the CQB envelope.


Home/ranch defense weapon, CQB to 150-200m. Occasional coyote or groundhog out to about the same range.
Link Posted: 2/20/2006 3:04:12 PM EDT
Does anybody know if the Noveske 12.5" Crusader barrel will be available in 6.8SPC?
Link Posted: 2/20/2006 3:25:24 PM EDT

Originally Posted By Gamma762:

Originally Posted By Capn_Crunch:

Originally Posted By Gamma762:
I know that 6.8 was somewhat designed for shorter barrel lengths, how much performance loss is there between, say, 16" and a 13.75"? I've been considering either a 13.75 or 14.5 with permanent muzzle device (KX3), or else a 16". Can't decide.

BTW, what's the typical thread pattern on 6.8 barrels?



1/2x28 is pretty common.

What's your intended role for this particular rifle? The frag range out of a 12" barrel with 110 VMAX is ridiculously long for that short of a barrel... Like, WAY outside of the CQB envelope.


Home/ranch defense weapon, CQB to 150-200m. Occasional coyote or groundhog out to about the same range.



I would stay with a 16" for you application. A shorter barrel (with permanent muzzle device does not buy you anything). My 16.5" (mil measurement to avoid confusion) works very well in a CQB environment. If you required concealment with very fast deployment, the true SBR lengths are the way to go.
Link Posted: 2/20/2006 3:43:40 PM EDT
10.5 with the new gen KX3s (The ones in the works) gets my vote.

Makes for a great cruiser carbine.

Big KX3 front end is highly intimidating.....

Simon
Link Posted: 2/20/2006 3:54:16 PM EDT
who makes 12'' 6.8 spc barrels?
Link Posted: 2/20/2006 5:48:05 PM EDT

Originally Posted By Gamma762:

Originally Posted By Capn_Crunch:

Originally Posted By Gamma762:
I know that 6.8 was somewhat designed for shorter barrel lengths, how much performance loss is there between, say, 16" and a 13.75"? I've been considering either a 13.75 or 14.5 with permanent muzzle device (KX3), or else a 16". Can't decide.

BTW, what's the typical thread pattern on 6.8 barrels?



1/2x28 is pretty common.

What's your intended role for this particular rifle? The frag range out of a 12" barrel with 110 VMAX is ridiculously long for that short of a barrel... Like, WAY outside of the CQB envelope.


Home/ranch defense weapon, CQB to 150-200m. Occasional coyote or groundhog out to about the same range.



With 110 VMAX you'll frag past 150M (easy) out of a 12.5" barrel. I think since you list HD, if I were limited to your choices, I'd go 14.5" with a Vortex or Troy MMD, unless you want to SBR it. If you were to go SBR, 12.5" would be ideal, especially with Surefire, RD, Ops Inc, or Jet's reflex style cans.
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