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Feb 7th, 2025
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 AR SBR Build advise
#4937440
01/27/14 10:42 PM
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Joined: Nov 2010
Posts: 1,616
Mfloski
OP
Pro Tracker
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OP
Pro Tracker
Joined: Nov 2010
Posts: 1,616 |
Simple question, what caliber makes the best SBR. I intend to build a DD MK18, but want to know if there is a better SBR caliber. If you were only going to build one, which one would it be?
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Re: AR SBR Build advise
[Re: Mfloski]
#4937466
01/27/14 10:53 PM
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Joined: Jan 2007
Posts: 27,384
KRoyal
Texoma Legend
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Texoma Legend
Joined: Jan 2007
Posts: 27,384 |
I believe both the 6.8SPCII and 300BLK were made for SBR's. Therefore you would probably get the best performance out of those 2 calibers in a SBR, but for me I don't want to pay $1+ per round for a fun gun. I went with 223/5.56. Maybe in the future I'll do a 7.62x39 SBR upper.
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Re: AR SBR Build advise
[Re: Mfloski]
#4937472
01/27/14 10:54 PM
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Joined: Feb 2009
Posts: 5,529
tannerlst
THF Trophy Hunter
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THF Trophy Hunter
Joined: Feb 2009
Posts: 5,529 |
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Re: AR SBR Build advise
[Re: Mfloski]
#4937533
01/27/14 11:20 PM
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Joined: Mar 2012
Posts: 3,809
Cleric
Extreme Tracker
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Extreme Tracker
Joined: Mar 2012
Posts: 3,809 |
Depends on what you want to do.
Sbr a 458 socom
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Re: AR SBR Build advise
[Re: Mfloski]
#4937540
01/27/14 11:21 PM
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Joined: Aug 2011
Posts: 13,492
jdk1985
THF Celebrity
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THF Celebrity
Joined: Aug 2011
Posts: 13,492 |
I run a DD MK18. 5.56. Badass. Accurate as hell. Love it.
Instagram @justinkingwoodworking
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Re: AR SBR Build advise
[Re: Mfloski]
#4937556
01/27/14 11:29 PM
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Joined: Jan 2014
Posts: 218
TX Grubby
Woodsman
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Woodsman
Joined: Jan 2014
Posts: 218 |
The build I am working on is a 300BLK
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Re: AR SBR Build advise
[Re: Mfloski]
#4937914
01/28/14 02:20 AM
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Joined: Mar 2011
Posts: 2,062
Toxarch
Veteran Tracker
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Veteran Tracker
Joined: Mar 2011
Posts: 2,062 |
5.56 doesn't like SBRs without some tuning.
I went 8.2" 300blk and love it.
It is far more important to be able to hit the target than it is to haggle over who makes a weapon or who pulls a trigger.
� Dwight D. Eisenhower
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Re: AR SBR Build advise
[Re: Mfloski]
#4937916
01/28/14 02:21 AM
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Joined: Sep 2009
Posts: 4,793
ccoker
Extreme Tracker
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Extreme Tracker
Joined: Sep 2009
Posts: 4,793 |
what are you going to use it for?
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Re: AR SBR Build advise
[Re: Mfloski]
#4938101
01/28/14 03:49 AM
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Joined: Jun 2009
Posts: 1,507
lglidewell
Pro Tracker
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Pro Tracker
Joined: Jun 2009
Posts: 1,507 |
I've got the DD MK18, have even shot it yet. Waiting to put a 1-4 scope on when I decide what I want.
I do know where a DD MK18 10.3" barrel is if you are interested. I have t made up my mind if I want to buy it yet. It's brand new, zero rounds through it.
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Re: AR SBR Build advise
[Re: lglidewell]
#4938699
01/28/14 03:12 PM
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Joined: Sep 2010
Posts: 2,799
NTXBowfisher
Veteran Tracker
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Veteran Tracker
Joined: Sep 2010
Posts: 2,799 |
I've got the DD MK18, have even shot it yet. Waiting to put a 1-4 scope on when I decide what I want.
I do know where a DD MK18 10.3" barrel is if you are interested. I have t made up my mind if I want to buy it yet. It's brand new, zero rounds through it. where is this DD MK18 barrel you speak of?
signature coming soon
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Re: AR SBR Build advise
[Re: Mfloski]
#4941400
01/29/14 04:59 PM
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Joined: Jun 2009
Posts: 1,507
lglidewell
Pro Tracker
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Pro Tracker
Joined: Jun 2009
Posts: 1,507 |
An individual is selling it on another forum I'm a part of, he wants $250. He's also trying to move a CMMG 8.5" .300acc blk 1/8 barrel for $200.
DD has that 10.3" barrel in stock at the moment (I just added it to a cart to make sure). $279
Last edited by lglidewell; 01/29/14 05:05 PM.
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Re: AR SBR Build advise
[Re: Toxarch]
#4943788
01/30/14 06:42 PM
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Joined: May 2009
Posts: 4,243
DallasShootingSupplies
Extreme Tracker
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Extreme Tracker
Joined: May 2009
Posts: 4,243 |
5.56 doesn't like SBRs without some tuning.
I went 8.2" 300blk and love it. Not sure where you heard that, thats only if you cut down a 16 inch barrel. A good factory 10.5 barrel will run like a sewing machine.
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Re: AR SBR Build advise
[Re: jdk1985]
#4943791
01/30/14 06:44 PM
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Joined: May 2009
Posts: 4,243
DallasShootingSupplies
Extreme Tracker
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Extreme Tracker
Joined: May 2009
Posts: 4,243 |
I run a DD MK18. 5.56. Badass. Accurate as hell. Love it. Excellent choice! If its your first one I would go 556, if you want more power go 6.8. I would only go 300 as a third option and if I reloaded. Its not impressive over than being quiet, 762x39 performance at 1-1.25 a round is fail.
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Re: AR SBR Build advise
[Re: DallasShootingSupplies]
#4943815
01/30/14 06:52 PM
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Joined: Dec 2010
Posts: 8,848
DocHorton
THF Trophy Hunter
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THF Trophy Hunter
Joined: Dec 2010
Posts: 8,848 |
5.56 doesn't like SBRs without some tuning.
I went 8.2" 300blk and love it. Not sure where you heard that, thats only if you cut down a 16 inch barrel. A good factory 10.5 barrel will run like a sewing machine. Why is cutting down a 16" barrel not ideal? Just curious as I am having one cut down to 11.5" right now....
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Re: AR SBR Build advise
[Re: DocHorton]
#4943820
01/30/14 06:54 PM
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Joined: Jun 2005
Posts: 2,481
BCJ
Veteran Tracker
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Veteran Tracker
Joined: Jun 2005
Posts: 2,481 |
5.56 doesn't like SBRs without some tuning.
I went 8.2" 300blk and love it. Not sure where you heard that, thats only if you cut down a 16 inch barrel. A good factory 10.5 barrel will run like a sewing machine. Why is cutting down a 16" barrel not ideal? Just curious as I am having one cut down to 11.5" right now.... The gas port size is different for a 11.5" vs 16" even though it's in the same location. You will have to slowing drill out the gas port to get the gun to run reliable without over gasing it.
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Re: AR SBR Build advise
[Re: BCJ]
#4943829
01/30/14 06:57 PM
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Joined: May 2009
Posts: 4,243
DallasShootingSupplies
Extreme Tracker
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Extreme Tracker
Joined: May 2009
Posts: 4,243 |
This. The gas ports are different sizes. Its an easy and cheap job to fix, but will need to be done most of the time. 5.56 doesn't like SBRs without some tuning.
I went 8.2" 300blk and love it. Not sure where you heard that, thats only if you cut down a 16 inch barrel. A good factory 10.5 barrel will run like a sewing machine. Why is cutting down a 16" barrel not ideal? Just curious as I am having one cut down to 11.5" right now.... The gas port size is different for a 11.5" vs 16" even though it's in the same location. You will have to slowing drill out the gas port to get the gun to run reliable without over gasing it.
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Re: AR SBR Build advise
[Re: Mfloski]
#4943987
01/30/14 08:22 PM
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Joined: Sep 2008
Posts: 1,160
gbeard
Pro Tracker
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Pro Tracker
Joined: Sep 2008
Posts: 1,160 |
Dont short barrels come pre drilled with the correct size hole? Kinda seems like they would. Or am I missing something here? Are you cutting down a 16" barrel?
Ah. Nevermind. missed the post about having it cut down
Last edited by gbeard; 01/30/14 08:22 PM.
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