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Centerfire Rifles - Semiautomatic or Gas Operated Centerfire rifles, carbines and other gas operated rifles.

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  #1  
Old 09-22-2010, 3:53 PM
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Default 6.8 Spec 2????

I got a DPMS 6.8 1/11 twist barrel on a trade, and was wondering how I can tell if its a Spec 1 or 2. Is there a way to tell without using a chamber gauge?
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Old 09-22-2010, 4:18 PM
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Call DPMS and ask?
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Old 09-22-2010, 4:19 PM
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Call DPMS and ask?
I did, they said to get someone to a chamber check or send it to them.
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Old 09-22-2010, 4:28 PM
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That's pretty lame, they should mark them well enough to tell you what chamber they put in it.

Oh well, they aren't exactly a top tier AR manufacturer.
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Old 09-22-2010, 4:29 PM
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Your best shot is on http://www.68forums.com/forums/index.php
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Old 09-22-2010, 4:40 PM
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Originally Posted by jtzshooters View Post
This^^^

The Barrett M468 was a 1:10 twist SPC I chamber
Later barrels moved to 1:11 twist, and SPC II chamber
Since your barrel is 1:11 the chances are good it's SPC II
The guys on 68Forums will know for sure.

Mine is punched into the barrel
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Old 09-22-2010, 4:41 PM
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if you live in the san fernando valley/chatsworth area, take it to addax tactical(calguns supporter) he`ll tell you for sure. he`s a 6.8mm spc specialist...if its a spec I he can ream the the barrel to a spec II for 30 bucks...I should know...he did mine. mine is a 1:10 twist....BUT....with a specII chamber upgrade
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Old 09-22-2010, 8:38 PM
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I got the specII reamer on the 68forums group share and reamed my stag 1/10 specI out to a specII . Unfortunately it's still a 1/10 twist but it will work fine til i have $300 laying around for a new arp barrel .
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Old 09-22-2010, 9:02 PM
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Being its a 1/11 twist, its a good sign..
Thank you all for your help..
I will go and check out that 6.8 forum...

Also I called Silver State Armory because I got a couple of boxes of SSA ammo along with the barrel..I told them what I had and they said it was spec 2.
I want to make sure..that's why I posted here..
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Old 09-22-2010, 9:07 PM
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I would sell it and get a barrel from AR Performance if I were you. Their chamber allows you to shoot hotter loads than anyone elses 6.8 SPC chambers. Plus they are nitrocarburized so they will last a loooooong time.
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  #11  
Old 09-22-2010, 10:10 PM
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If you are in the LA area, swing by the shop.

I can check it out for you in less than 1 minute.

If it needs to be reamed, no problem, I have a SpecII reamer.

Chris
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Old 09-23-2010, 8:36 AM
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Toss it and get a 6.5 Grendel.... j/k

Your chamber most likely be SPCII if you have 1/11 twist. I do believe the 1/11 twist was accepted after the SPC II chamber. You can also send it to AR15 Performance to have the chamber reamed to his specs (regardless of what chamber you have). It'll help with the performance of the type of load you shoot... especially if you roll your own. Drop him a line at info@ar15performance.com BTW, Addax is a supporter of 68Forums also so he's a good person to go to locally.

An ARP barrel would be better but since you have it might as well check it and use it....

Then upgrade to an ARP.
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  #13  
Old 09-23-2010, 10:10 PM
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Quote:
Originally Posted by Addax View Post
If you are in the LA area, swing by the shop.

I can check it out for you in less than 1 minute.

If it needs to be reamed, no problem, I have a SpecII reamer.

Chris
Thank You very much for the offer...Unfortunately I'm in Nothern Kali...
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  #14  
Old 09-23-2010, 11:00 PM
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Quote:
Originally Posted by cqbdude View Post
Thank You very much for the offer...Unfortunately I'm in Nothern Kali...
If you want to ship it down, no problem, as long as you take care of the return shipping.

More than likely you have a SPECII chamber, but if you are unsure, and you are going to shoot the hotter loads, then it does not hurt to verify...
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