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I am going forward with the build officially and looking at barrels now. I have read that 300blk has pretty much nothing to gain past about a 10" barrel. I want to use sub sonic loads mainly in this build and a suppressor. I am submitting my electronic info for 2 stamps for both the can and the lower this week and just sorting some details out before I do. Just wanting to see if this is the general consensus here that a 10.5" or so barrel is optimal for this application.
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It depends on what you call optimal. It will show velocity gains with increasing barrel length, but not near as much as a lot of rifle rounds. If you're mostly going to shoot sub sonic then the additional length and weight of going with a longer barrel is probably not worth it.
Here is a graph of velocity vs barrel length I found for 5.56, 300 BLK, and 6.8. I realize you'd be using much heavier bullets for subsonic loads but it shows the trend.
Atlantic Blue '00 - '03 Cobra motor and TKO600, solid axle, full MM suspension
Silver '01 Vette - D1 blown LS -
I run a 9.5", wish I had a 7.5""When the people find that they can vote themselves money, that will herald the end of the republic." -Benjamin Franklin
"A democracy will continue to exist up until the time that voters discover that they can vote themselves generous gifts from the public treasury." -Alexander Fraser TytlerComment
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I was thinking of picking up the red X 7.5" 300 blk assembled upper.Originally posted by CJ View PostComment
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Just make sure its a 1:7 twist.Originally posted by inline 6 View Post"When the people find that they can vote themselves money, that will herald the end of the republic." -Benjamin Franklin
"A democracy will continue to exist up until the time that voters discover that they can vote themselves generous gifts from the public treasury." -Alexander Fraser TytlerComment
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I just checked and it is. Please educate me why that is important for this application though.Comment
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Well I just threw down on a 7.5" red X assembled upper and a tunderbeast arms 30p-1 suppressor. Its going to be the longest 4 months or so I have had in a long time.
And before I get reamed by cj for not buying a suppressor that can be taken apart for cleaning. I did my homework and for this titanium suppressor. When I feel that it needs it I will give it a thorough bath in the ultrasonic cleaning machine I have at my disposal at work. Those things with the chemicals that are in them clean the living shit out of stuff.
As far as the upper, I wasn't going for the cheapest I could find by any means but this thing is just flat out half the price of anything else I could find. I compared specs and even build materials and I just dont see where people ask 1k+ for an assembled upper. I dont see where the cost is.Comment
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Rifle cans are not serviceable. Only low pressure ones are like .22 and AK cans. Thunderbeast makes good suppressors.Originally posted by inline 6 View Post"When the people find that they can vote themselves money, that will herald the end of the republic." -Benjamin Franklin
"A democracy will continue to exist up until the time that voters discover that they can vote themselves generous gifts from the public treasury." -Alexander Fraser TytlerComment
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Good to know, If anyone ever needs the ultrasonic bath service let me know.Originally posted by CJ View PostComment
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Cj, what buffer are you running in your short 300blk?Comment
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Standard carbine is fine.Originally posted by inline 6 View Post"When the people find that they can vote themselves money, that will herald the end of the republic." -Benjamin Franklin
"A democracy will continue to exist up until the time that voters discover that they can vote themselves generous gifts from the public treasury." -Alexander Fraser TytlerComment
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Ive got a 30P-1 in wait and decided to get a 300blk as well, but opted for the 16" as I don't want to start yet another stamp (yet) on an SBR....
Any issues with it, in the esteemed opinions of this board (CJ?)?Comment
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I know a trust guy when you decide to.Originally posted by Roscoe View PostOriginally posted by Theodore RooseveltComment
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Issues with? I just sent my barrel off to get cut down to 6". 3/8" dwell time, woo!Originally posted by Roscoe View Post"When the people find that they can vote themselves money, that will herald the end of the republic." -Benjamin Franklin
"A democracy will continue to exist up until the time that voters discover that they can vote themselves generous gifts from the public treasury." -Alexander Fraser TytlerComment
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