10.5 or 11.5?

11.5

I didn't ask for 12.5.

>tfw you know 11.5 is the correct answer but you want to go as short as possible

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Most evidence points to 11.5 having better benefits overall compared to 10.3. Unless you're trying to go for a MK18 clone, go for 11.5.

I own both and my 10.3 is my safe queen clone build and my 11.5 is my HD gun.

7.62x39 w/ 8" barrel

Nothing wrong with the .30-30 friend; in fact that's a pretty glowing comparison, it's been killing medium/large game dead at intermediate ranges for over 100 years.

Well sucks to be you, that's my answer and I'm sticking to it, 12.5" has big ballistic advantages over 10.5" or 11.5" that make it a superior choice with the exception of running suppressors.

>7.62x39 w/ 8" barrel
Enjoy your fireballs I guess

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The more time passes, the more 10.3 looks like a big mistake.

What .300 Blackout 11.5" barrel do I buy?
>bonus points - what rail

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Does it matter? You're not going to shoot it long range enough to ever notice any difference.

11.5 for 5.56
9 for .300 blk
7 for 9mm
12.5 for 6.5grendel

18 for 5.56 DMR

>5.56
>DMR
lmao pick one
>18 for 5.56 DMR
should have just said 308

11.5
Better dwell time

>Better dwell time
dwell time is a fucking meme, reliability issues have been sorted out of Mk18s for over 2 decades.

just don't buy barrels from literally whos that don't know how to properly size a gas port.

Nice illiteracy bro, I pointed out 10.5's are plenty reliable. There's a lot more to a gun than "does it go bang".

Been toying with the idea of building a 12.5. At first it was just for the look but after some research it's starting to look good as an all-around carbine. Do you think a 12.5 is worth the weight and length savings versus a 14.5?

Nah, any thing over 8"is usually to much to handle... well, depending how thick the hand guard isactually.

>tfw there is an will never be a suitable caliber for 8" sbrs that isn't meme tier.

11.5 sees a significant jump in ballistics and dwell time for how little longer it is. If you want to go any shorter I would recommend something like 300 meme out, unless you enjoy having money.

0.0
Fire directly out the chamber

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Yes. 12.5" is objectively the best barrel length until you get up to 20" where you can punch through level iii armor.

20" is a waste of weight.
-t. loving 20" AR owner.

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>12.5" has big ballistic advantages over 10.5" or 11.5" that make it a superior choice
wow amazing conclusion Einstein, longer barrel = more velocity big if true lets all save time and go to 20" if you faggots are just going to say every 1" increment over a shorter barrel means you're better off.

Except the gains you get from increasing barrel length are non-linear you fucking brainlet; that 1-2" of additional barrel length matter a hell of a lot more when you are talking about ultra short SBRs vs 20" rifle barrels. ~12" is the sweet spot for maximizing velocity while keeping the rifle short and handy, see

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11.5 means more gas and more recoil, tardboi.

11.5 by a landslide. 12.5 is the only real competition.

>lower velocity for 11.5 than 10.5 and 100fps gain for 12.5 when according to almost all other sources the velocity gain from 10.5 to 11.5 is considerably greater than 11.5-12.5
Doubt.
>he has literally 0 understanding of ARs
lol

>Doubt.
Here's the source, it's one of the few decent things I've ever seen come out of arfcom. The guy responsible for gathering the data actually did really good work and tested a lot of different types of ammo, I find the conclusions pretty believable.

ar15.com/forums/ar-15/-/16-714088/?

Yeah those numbers for the 77gr BH MK load seem a little weird. The numbers for the IMI 77gr OTM seem much more believable and IMO still point to 12.5" being the sweet spot.

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mu'nigga

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>18 for DMR
loooooooooool
600 yards isn't DMR range
None of you dumb fatasses can shoot for shit, that's for sure.

>11.5 for 5.56
>9 Inch for .300 Memeout.
every fucking time. Go with a 11.5 inch barrel minimum and heavier 556 bullets for best use.
I particularly like magtech 77gr OTM.

Look at Magtech 77gr OTM.
Normally hotter than black hills 77gr otm but not the 77gr TMK.

Slings lead right? 8", no actually 1", you got 30 in the mag, use 'em. Operators and ninjas are the only people hot and bothered about barrel length, idiots. I may have a large deposit of rectally administered boner pills and a solidified prostate due to the fact, but a .300 BLK or 5.56 NATO rifle at that length will still punch right through my colon like Alex Jone's iodine treatment does FEMA GMOs. Stay safe and remember not everything you read on the internet is true. One love, peace.

P.S.
What's the deal with all the range traps posting these days? I guess they really are putting chemicals in the water because if they're gay then so I am, but hey this is Jow Forums after all so that's not exactly a shocker. Anyways, remember to subscribe to my Plenty of Fish blog where I'll be reviewing Christian THOTs.

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Regardless, 11.5 offers lower recoil.

Do straight gas tubes increase reliability, especially with carbine gas systems? And if so, is it enough of a reliability enhancement that you stray away from having more parts commonality with standard ar-15's? I'm just wondering since LMT and KAC uses straight gas tubes

18.

300 blackout supers out of a 9" barrel have the same amount of energy as a 5.56 out of a 14.5" barrel. 300 blackout is absolutely perfect for shorter barrel rifles as that's what the round was designed for.

Are you having a stroke whole writing this shitty post?

So why exactly do you think 300 blackout is a meme? Asking honestly.

11.5, but later build a 10.5 (10.3) upper and swap them as you desire.

For funzies build a 7.5 upper and throw on there when you want to be obnoxious. Go for maximum over-meme.

Its retarded and unnecessary

For suppressing there isn't anything better for the AR platform than 300 blackout subs.

For getting the most energy out of a very short barrel 300 blackout supers do a great job. What's not to love about 30-30 ballistics out of an ultra small/compact rifle with a detachable 30 round magazine?

I like my HK MR223 in 11" with a suppressor.

9mm isn't a meme round

and has the same muzzle energy from a 7.5in barrel as 5.56 does

But it can't even penetrate soft body armor, so what's the point?

>what is 7.62x39, for $500 Alex.

Are you fingering your butt whole while writing this shitty post?

So an AK?

What upper is that?

AK fags fuck off this is an AR thread

That chart is sketch as fuck

>7.62x39 ARs dont exist
Imagine being this fucking stupid you absolute faggot

>Imagine thinking those abortions fucking work in any sort of way
Lmaoing at your life, go back to buying rifles worth $200 at $600+

I just screwed together a 12.5 with mid length gas... It's pretty ok.

>I want something build for 8" sbr's
>complains that the caliber built for 8" sbr's is retarded
as evidenced, you are retarded and unnecessary

>10.5 consistently has a higher velocity than 11.5
This flies in the face of physics and every single 5.56 barrel length test ever conducted.

7.5” with a tank brake

>77gr
fuck those stupid gucci loads I swear 99% of the shooting anyone does here with be with the cheapest 55gr or 62gr they can find

To be fair, 20" is what the 5.56 is best suited for...
[spoiler]gib m16a1 gf...pls[/spoiler]

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Why do 12 inch barrels have less velocity than 11 inch ones? It doesn't make sense

What's the shortest barrel for 5.56 that you can put a carbine gas system on?

What about for .300?

Oh shit, I'm sorry, should've read downwards one more post. [spoiler]still...gib m16a1 gf...pls[/spoiler]

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10.3 I think. With the Mk18's, they cut the barrel as short as possible that still allows the use of a suppressor. Although, that is with a standard front sight gas block, so i don't know what it would be with a low profile one.

10.5 for memeout
11.5 for 5.56

Doubt it sperglord. 7.5" is still around 600 to 800 ftlbs when I checked last. No 9mm load, aside from cherrypicked bullshit, is doing that.

>imagine backpedaling this hard
Maximum damage control

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Filthy peasant why do you even post here?
Nothing lighter than 69gr has ever exited my HK.

I don't care what my pistol does with 55gr because I'm not using 55gr except as range ammo. 77gr is for killing.