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Posted: 8/3/2014 12:12:48 AM EDT
[#1]
HK416
 . Or the new Daniel Defense suppressed .300 blackout
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Posted: 8/3/2014 12:15:34 AM EDT
[#2]
12.5" DI, build.
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Posted: 8/3/2014 12:21:24 AM EDT
[#3]
Quoted:
HK416 . Or the new Daniel Defense suppressed .300 blackoutI want to stay with 5.56/.223 |
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Posted: 8/3/2014 12:22:00 AM EDT
[#4]
Quoted:
12.5" DI, build. Why 12.5 over 11.5? |
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Posted: 8/3/2014 12:32:45 AM EDT
[#5]
Quoted:
Quoted:
12.5" DI, build. Why 12.5 over 11.5? Better velocity while still being compact. 12.5" is the sweet spot for short barreled 5.56. Can't make a Kino with an 11.5". 12.5" is also long enough to work with most reflex suppressors, although they aren't really in style these days. |
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Posted: 8/3/2014 12:37:05 AM EDT
[#6]
I think the Noveske Crusader barrels are available again. Build away.
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Posted: 8/3/2014 12:43:32 AM EDT
[#7]
I personally wouldn't bother with a 12.5" barrel...those 2.2 inches are still going to cost you $200.
If you're going to go short, go short. You plan on adding a 6 or 7" can to your rifle: 10.3" barrel plus 7" can = 17". |
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Posted: 8/3/2014 12:44:59 AM EDT
[#8]
Quoted:
Quoted:
Quoted:
12.5" DI, build. Why 12.5 over 11.5? Better velocity while still being compact. 12.5" is the sweet spot for short barreled 5.56. Can't make a Kino with an 11.5". 12.5" is also long enough to work with most reflex suppressors, although they aren't really in style these days. I don't have much knowledge of suppressors yet..... Relfex suppressors?? |
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Posted: 8/3/2014 12:46:24 AM EDT
[#9]
Quoted:
I think the Noveske Crusader barrels are available again. Build away. If I do end up building I will most probably go with one of the nitrided DD barrels. |
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Posted: 8/3/2014 12:48:55 AM EDT
[#10]
Quoted:
I personally wouldn't bother with a 12.5" barrel...those 2.2 inches are still going to cost you $200. If you're going to go short, go short. You plan on adding a 6 or 7" can to your rifle: 10.3" barrel plus 7" can = 17". I have heard of some reliability issue with barrels that short? I still want it long enough to have a well balanced rifle and I want as must velocity as possible. |
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Posted: 8/3/2014 12:55:46 AM EDT
[#11]
Quoted:
Quoted:
I personally wouldn't bother with a 12.5" barrel...those 2.2 inches are still going to cost you $200. If you're going to go short, go short. You plan on adding a 6 or 7" can to your rifle: 10.3" barrel plus 7" can = 17". I have heard of some reliability issue with barrels that short? I still want it long enough to have a well balanced rifle and I want as must velocity as possible. Visit the MK18 thread. The DD 10.3 barrel is very reliable, and many of the guys have cans. Mine does not have a can, but had been 100% for the first 1K rounds. As far as balance, it would likely be damn near perfect with a can. I can't help with the velocity debate. |
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Posted: 8/3/2014 1:27:33 AM EDT
[#12]
11.5" (Or 10.3, as has been mentioned.) Why: If you're going to deal with the paperwork and money to get a SBR, IMO, you should exploit it to the fullest, and lose as much length as possible.
DI. Why: Proven, extremely common parts, doesn't cost more for dubious benefits. Build. Why: It's cheaper, you get what you want, and why not? |
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Posted: 8/3/2014 2:21:08 AM EDT
[#13]
Reflex suppressors mount back over the barrel. Look at OPS or the M110 can from KAC.
12.5 is a real step down in bulk from 14.5 but functions and performs more like a 14,5 than a 10.5. 10.5s are more finicky, particularly as they near the end of their service life (which is fewer rounds than a longer barreled rifle). |
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Posted: 8/3/2014 3:39:24 AM EDT
[#14]
11.5 DI
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Posted: 8/3/2014 4:37:37 AM EDT
[#15]
Get a 12.5" DI upper from Bravo Company and call it a day.
.02 |
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Posted: 8/3/2014 5:51:08 AM EDT
[#16]
I just built a 10.3" SBR DI and am very happy with performance and reliability, it was also easier to build than I expected. I was about to recommend the the same but then saw your 300 the requirement, that's tough for any SBR so I would say at minimum get a 12.5" to achieve enough velocity to reduce drop and have the energy to take down a big at those distances.
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Posted: 8/3/2014 6:23:53 AM EDT
[#17]
I went with a 12" for the combo of ammo versatility and weight/maneuverability. The 12" will still propel 55g m193 to over 2800fps and that is good enough to make it effective over short distances, any shorter and that round ceases to be an option. All 5.56/.223 ammo will be more effective out of a 12" vs a shorter barrel. As far as a suppressor on it, I have a SWR Specwar that rides my 12" and it isnt any longer than my 16" with a Trifecta FS/ suppressor mount.
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Posted: 8/3/2014 6:51:00 AM EDT
[#18]
Quoted:
Quoted:
I personally wouldn't bother with a 12.5" barrel...those 2.2 inches are still going to cost you $200. If you're going to go short, go short. You plan on adding a 6 or 7" can to your rifle: 10.3" barrel plus 7" can = 17". I have heard of some reliability issue with barrels that short? I still want it long enough to have a well balanced rifle and I want as must velocity as possible. Then there's a whole bunch of needlessly risking our lives with finicky guns. Truth: absolutely reliable. Velocity: at what range do you plan to shoot? You and the guy you hit will never know the difference between a 10" barrel and a X" barrel. |
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Posted: 8/3/2014 7:05:14 AM EDT
[#19]
Quoted:
Quoted:
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I personally wouldn't bother with a 12.5" barrel...those 2.2 inches are still going to cost you $200. If you're going to go short, go short. You plan on adding a 6 or 7" can to your rifle: 10.3" barrel plus 7" can = 17". I have heard of some reliability issue with barrels that short? I still want it long enough to have a well balanced rifle and I want as must velocity as possible. Then there's a whole bunch of needlessly risking our lives with finicky guns. Truth: absolutely reliable. Velocity: at what range do you plan to shoot? You and the guy you hit will never know the difference between a 10" barrel and a X" barrel. Not with the right ammo |
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Posted: 8/3/2014 7:09:08 AM EDT
[#20]
I'm leaning to 11.5" these days.
Have two, 1 D.I. and 1 Piston. Looking to build a 3rd. It will be a D.I. I don't like the extra weight or specific parts for a piston. Dave N |
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Posted: 8/3/2014 7:41:07 AM EDT
[#21]
Quoted:
Quoted:
Quoted:
Quoted:
I personally wouldn't bother with a 12.5" barrel...those 2.2 inches are still going to cost you $200. If you're going to go short, go short. You plan on adding a 6 or 7" can to your rifle: 10.3" barrel plus 7" can = 17". I have heard of some reliability issue with barrels that short? I still want it long enough to have a well balanced rifle and I want as must velocity as possible. Then there's a whole bunch of needlessly risking our lives with finicky guns. Truth: absolutely reliable. Velocity: at what range do you plan to shoot? You and the guy you hit will never know the difference between a 10" barrel and a X" barrel. Not with the right ammo Exactly. |
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Posted: 8/3/2014 11:13:31 AM EDT
[#22]
Quoted:
Quoted:
Quoted:
I personally wouldn't bother with a 12.5" barrel...those 2.2 inches are still going to cost you $200. If you're going to go short, go short. You plan on adding a 6 or 7" can to your rifle: 10.3" barrel plus 7" can = 17". I have heard of some reliability issue with barrels that short? I still want it long enough to have a well balanced rifle and I want as must velocity as possible. Then there's a whole bunch of needlessly risking our lives with finicky guns. Truth: absolutely reliable. Velocity: at what range do you plan to shoot? You and the guy you hit will never know the difference between a 10" barrel and a X" barrel. Mk18 works for SOF because they have the expertise to maintain them and the budget to replace them. I wouldn't advise them for big Army or people who won't do maintenance regularly like gas rings and barrel replacements. |
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Posted: 8/3/2014 1:28:04 PM EDT
[#23]
Quoted:
Mk18 works for SOF because they have the expertise to maintain them and the budget to replace them. I wouldn't advise them for big Army or people who won't do maintenance regularly like gas rings and barrel replacements. Our CQBRs don't have any more problems nor do they get any more/different maintenance than M4A1s hosting them. There's a whole bunch of guys in the Mk18/CQBR thread that would also disagree. While it may be true that they are over-gassed and therefore harsher on internals, internet myth would have you believe that you will notice that difference. But OP asked about 11.5 versus 12.5 so I vote 11.5 (or shorter). 
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Posted: 8/3/2014 1:42:38 PM EDT
[#24]
Crane would also disagree with you, as would a number of very distinguished FAGs if the training community. The shorter the barrel the shorter the service life and the more sensitive to weather among other things.
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Posted: 8/3/2014 4:52:25 PM EDT
[#25]
11.5" with reflex AAC SPR-M4, FWIW 55 grain bullet velocity chronographs at 2800+ ft/secs in 5.56 NATO pressure loads.
 11.5" with direct thread mounted AAC Cyclone  |
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Posted: 8/3/2014 7:41:10 PM EDT
[#26]
Thanks everyone for your input. I have decided to build an 12.5" DI gun. I feel the 12.5 will be a big improvement as far as handling and maneuverability over my 16' and 18" guns, but it will retain a good amount of velocity. Another plus since I will be running irons most of the time (unless on a night hunt) is I will be able to have a longer sight radius which will be helpful for the longer shots I may encounter.
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Posted: 8/3/2014 7:45:28 PM EDT
[#27]
Quote HistoryQuoted:
12.5" DI, build. |
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Posted: 8/3/2014 8:28:31 PM EDT
[#28]
Quote HistoryQuoted:
Crane would also disagree with you, as would a number of very distinguished FAGs if the training community. The shorter the barrel the shorter the service life and the more sensitive to weather among other things. And I agreed about the shorter service life. Point is: if the longer barreled gun has an MTBF of 11,435 rounds and the shorter barreled gun has an MTBF of 10,933 rounds and you're looking at your gun every time you shoot it an performing scheduled maintenance, you will never notice the difference. Hmmm, might have to tell the guys we need to worry about the weather out there on the 2-way. 
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Posted: 8/3/2014 9:48:02 PM EDT
[#29]
I really should have said temperature. If matters.
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Posted: 8/4/2014 3:21:41 AM EDT
[#30]
I've got several, 10.3, 10.5's, 11.5's, 12.5's and my favorite is our
12.5 MID length gas. That is about as short as you can go on a Midlength gas system. I was running a 11.5" for the reasons others mentioned but went up to a 12.5 since our barrels run great with a Mid gas system. So they are smoother without a suppressor and our adjustable gas block makes it smooth with a suppressor. We are using a patented hybrid polygonal rifling which produces more backpressure than other barrels we have tested so the port sizes are smaller. Notice the 10.5 carbine barrel and compare to the 12.5 Mid barrel. Dwell time is the same but pressure is less on the Mid as the port is further away from the chamber. We did some testing on other barrels doing the 12.5 Mid. We took a well known cold hammer forged barrel which was originally a 14.5 Mid and cut it down to 12.5 and it wouldn't be reliable till the port was .089 while our barrels run reliably at .078. At .089 it was kind of pointless as it wasn't that smooth. In contrast, most manufacturers port there 14.5 and 16" Mid barrels at around .078 - .082. I'm running the 4th barrel down in the picture below:  Here is my setup suppressed:  I put a 6-24 power scope on it and got a .65" group at 100 yards.   We are turning some fluted 12.5" Mid's now:  Here is how it runs in full auto unsuppressed and suppressed:  Some more info, pics and vid on my site: http://micromoa.com And our Facebook page: https://www.facebook.com/MicroMOA |
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Posted: 8/5/2014 3:52:28 PM EDT
[#31]
I just picked up an 11.5" BCM BFH upper. It was a great deal given the free BCG promotion right now. I couldn't even build it for the price I paid.
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Posted: 8/6/2014 11:59:09 AM EDT
[#32]
Quote HistoryQuoted:
I just picked up an 11.5" BCM BFH upper. It was a great deal given the free BCG promotion right now. I couldn't even build it for the price I paid. Can't wait to get mine in the mail. |
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