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What barrel for SBR?
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In Memoriam   Location: Snohomish Joined: Wed May 11, 2011 Posts: 1587 Real Name: Dan 
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Starting to line up parts for my build. Cant decide on a barrel. The upper on it is currently a DD 16" true pencil barrel so im thinking something along the same tier. Looking at DD 10.3, BCM 11.5 HF or their Enhanced lightweight, Maybe a WC 11.3. Others that i may be forgetting? What say you guys?
 _________________ Eff 594 and 1639 Last edited by das_napeth on Sun Aug 13, 2017 10:20 am, edited 1 time in total. |
| Sun Aug 13, 2017 9:57 am |
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 Site Supporter  Location: Nampa, Idaho Joined: Thu Mar 17, 2011 Posts: 19468 Real Name: Rick
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Curious about the shorter barrels twist rate.
Is there some sort of guide for twist vs length? _________________ ‘What’s the point of being a citizen if an illegal gets all the benefits’ |
| Sun Aug 13, 2017 10:03 am |
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Site Admin   Location: Renton, WA Joined: Sun Mar 13, 2011 Posts: 52067 Real Name: Steve
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Do you already have an approved Form 1? What barrel length do you have on there?
_________________ Steve Benefactor Life Member, National Rifle Association Life Member, Second Amendment Foundation Patriot & Life Member, Gun Owners of America Life Member, Citizens Committee for the Right to Keep and Bear Arms Legal Action Supporter, Firearms Policy Coalition Member, NAGR/NFGR Please support the organizations that support all of us. Leave it cleaner than you found it. |
| Sun Aug 13, 2017 10:07 am |
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Site Supporter  Location: Snohomish, WA Joined: Thu Jan 26, 2012 Posts: 1369 Real Name: Bo
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Have/had a DD 10.3" 7-Twist. It shot 3" groups at 100yds with a red dot and 55gr Z-Max. I also have a 8" Ballistic Advantage 7-Twist that shoots equally well. My next one will be a 10.3" Ballistic Advantage barrel. Shoots just as well and save a little coin.
_________________ "I don't know what it's called. I just know the sound it makes, when it takes a man's life." ~ Four Leaf Tayback |
| Sun Aug 13, 2017 10:07 am |
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Site Supporter  Location: Auburn/Kent/Renton Joined: Thu Nov 24, 2011 Posts: 766
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BlDtyLry wrote: Have/had a DD 10.3" 7-Twist. It shot 3" groups at 100yds with a red dot and 55gr Z-Max. I also have a 8" Ballistic Advantage 7-Twist that shoots equally well. My next one will be a 10.3" Ballistic Advantage barrel. Shoots just as well and save a little coin. 3moa with what are essentially match grade bullets? Is this normal from SBR AR's? _________________ Freedom is never more than one generation away from extinction. We didn't pass it to our children in the bloodstream. It must be fought for, protected, and handed on for them to do the same. - Ronald Reagan NRA Certified RSO SAF/NRA Life Member |
| Sun Aug 13, 2017 10:15 am |
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Site Supporter  Location: Lynnwood and at large Joined: Wed May 1, 2013 Posts: 21291 Real Name: Vick Lagina
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Blaze.45 wrote: BlDtyLry wrote: Have/had a DD 10.3" 7-Twist. It shot 3" groups at 100yds with a red dot and 55gr Z-Max. I also have a 8" Ballistic Advantage 7-Twist that shoots equally well. My next one will be a 10.3" Ballistic Advantage barrel. Shoots just as well and save a little coin. 3moa with what are essentially match grade bullets? Is this normal from SBR AR's? pretty much, for 5.56. Unless you jump to .300 blackout _________________ “Finding ‘common ground’ with the thinking of evil men is a fool’s errand” ~ Herschel Smith "The “A return to First Principles in a Republic is sometimes caused by simple virtues of a single man. His good example has such an influence that the good men strive to imitate him, and the wicked are ashamed to lead a life so contrary to his example. Before all else, be armed!” ~ Niccolo Machiavelli Láodòng zhèng zhūwèi zìyóu FJB |
| Sun Aug 13, 2017 10:18 am |
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In Memoriam Location: Snohomish Joined: Wed May 11, 2011 Posts: 1587 Real Name: Dan
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MadPick wrote: Do you already have an approved Form 1? What barrel length do you have on there? Yes i do. Upper is currently a 16"...maybe if you had read the post  _________________ Eff 594 and 1639 |
| Sun Aug 13, 2017 10:39 am |
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Site Supporter Location: Auburn/Kent/Renton Joined: Thu Nov 24, 2011 Posts: 766
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das_napeth wrote: MadPick wrote: Do you already have an approved Form 1? What barrel length do you have on there? Yes i do. Upper is currently a 16"...maybe if you had read the post I think he was referring to the barrel length you specified on the Form 1 paperwork.  _________________ Freedom is never more than one generation away from extinction. We didn't pass it to our children in the bloodstream. It must be fought for, protected, and handed on for them to do the same. - Ronald Reagan NRA Certified RSO SAF/NRA Life Member |
| Sun Aug 13, 2017 10:42 am |
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Site Admin Location: Renton, WA Joined: Sun Mar 13, 2011 Posts: 52067 Real Name: Steve
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LOL.... rookies.
 _________________ Steve Benefactor Life Member, National Rifle Association Life Member, Second Amendment Foundation Patriot & Life Member, Gun Owners of America Life Member, Citizens Committee for the Right to Keep and Bear Arms Legal Action Supporter, Firearms Policy Coalition Member, NAGR/NFGR Please support the organizations that support all of us. Leave it cleaner than you found it. |
| Sun Aug 13, 2017 10:46 am |
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In Memoriam Location: Snohomish Joined: Wed May 11, 2011 Posts: 1587 Real Name: Dan
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Guess i should have clarified in my first post. I have 2 approved forms...1 with 10.5 and 1 with 11.5. I was just planning on building 1 right now. They are essentially identical minus the serial number, trigger and one doesnt have an upper yet. The upper thats on the one is going to my father in law, so i will be putting whatever barrel i get on the corresponding lower. I just tend to prefer the one serial over the other since it was handpicked
_________________ Eff 594 and 1639 Last edited by das_napeth on Sun Aug 13, 2017 11:19 am, edited 1 time in total. |
| Sun Aug 13, 2017 10:59 am |
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Site Supporter Location: Snohomish, WA Joined: Thu Jan 26, 2012 Posts: 1369 Real Name: Bo
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AR15L wrote: Curious about the shorter barrels twist rate. Is there some sort of guide for twist vs length? Yes --> http://www.bergerbullets.com/twist-rate-calculator/ IMHO - two full rotations is ideal for rifle bullets. For SBR's I try to get as much as possible. Pistol caliber SBRs are different. _________________ "I don't know what it's called. I just know the sound it makes, when it takes a man's life." ~ Four Leaf Tayback |
| Sun Aug 13, 2017 11:16 am |
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Site Supporter Location: Nampa, Idaho Joined: Thu Mar 17, 2011 Posts: 19468 Real Name: Rick
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BlDtyLry wrote: AR15L wrote: Curious about the shorter barrels twist rate. Is there some sort of guide for twist vs length? Yes --> http://www.bergerbullets.com/twist-rate-calculator/ IMHO - two full rotations is ideal for rifle bullets. For SBR's I try to get as much as possible. Pistol caliber SBRs are different. I saw that early and that's why I asked. If you read it again, they are only taking the bullets measurement, not the length of the barrel. You're saying two full rotations or more per whatever the length of the barrel is? Or am I out in left field on all this? _________________ ‘What’s the point of being a citizen if an illegal gets all the benefits’ |
| Sun Aug 13, 2017 3:32 pm |
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In Memoriam Location: Snohomish Joined: Wed May 11, 2011 Posts: 1587 Real Name: Dan
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AR15L wrote: BlDtyLry wrote: AR15L wrote: Curious about the shorter barrels twist rate. Is there some sort of guide for twist vs length? Yes --> http://www.bergerbullets.com/twist-rate-calculator/ IMHO - two full rotations is ideal for rifle bullets. For SBR's I try to get as much as possible. Pistol caliber SBRs are different. I saw that early and that's why I asked. If you read it again, they are only taking the bullets measurement, not the length of the barrel. You're saying two full rotations or more per whatever the length of the barrel is? Or am I out in left field on all this? The way I read it is 2 full bullet rotations before exiting muzzle. Example would be: 5.56 1-7 twist would be 14 inch barrel or .308 1-10 twist would be a 20 inch barrel _________________ Eff 594 and 1639 |
| Sun Aug 13, 2017 3:54 pm |
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Site Supporter Location: Lynnwood and at large Joined: Wed May 1, 2013 Posts: 21291 Real Name: Vick Lagina
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That's how I understood him. so-o-o for a 1:7 twist a 14" or greater barrel is optimum?
Therefore, you're never going to get a good spin on a .223 or 5.56 out of a 10" or smaller barrel. Thus the underperformance cited. _________________ “Finding ‘common ground’ with the thinking of evil men is a fool’s errand” ~ Herschel Smith "The “A return to First Principles in a Republic is sometimes caused by simple virtues of a single man. His good example has such an influence that the good men strive to imitate him, and the wicked are ashamed to lead a life so contrary to his example. Before all else, be armed!” ~ Niccolo Machiavelli Láodòng zhèng zhūwèi zìyóu FJB |
| Sun Aug 13, 2017 3:55 pm |
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Site Supporter Location: Lynnwood and at large Joined: Wed May 1, 2013 Posts: 21291 Real Name: Vick Lagina
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jinx!
_________________ “Finding ‘common ground’ with the thinking of evil men is a fool’s errand” ~ Herschel Smith "The “A return to First Principles in a Republic is sometimes caused by simple virtues of a single man. His good example has such an influence that the good men strive to imitate him, and the wicked are ashamed to lead a life so contrary to his example. Before all else, be armed!” ~ Niccolo Machiavelli Láodòng zhèng zhūwèi zìyóu FJB |
| Sun Aug 13, 2017 3:56 pm |
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