8.5 or 10.5 300 blk

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Posted: 10/22/2015 8:27:59 PM EDT

Help me decide on a barrel length.
Going to sbr one of my lowers and build a 300 blk.
It will not be suppressed right away but maybe down the line.
Will likely hunt hogs and deer with it and of course use it as a range toy/home defense.
I like the looks of a 8.5 but am unsure or the advantages/disadvantages of either.
Would the 10.5 have better bullet stability?

Also, post pictures of yours too help me decide

Posted: 10/22/2015 9:30:32 PM EDT

[#1]

Just do the 8.5 since you are going to SBR it. I have an 8.2 Noveske and couldn't be happier with it. As far as bullet stability, look at the rate of twist and bullet weights rather than barrel length.

Posted: 10/22/2015 10:07:18 PM EDT

[#2]

Get a 9 inch AAC upper? Best of both worlds? I may pull my 8.5, 9 and 10.5 inch 300 blk out the safe to take a pic for you....

Posted: 10/22/2015 10:18:46 PM EDT

[#3]

Also debating these two lengths. Tag for feedback

Posted: 10/22/2015 10:34:24 PM EDT

[#4]

This picture really doesn't do it justice, b/c of the flash hider on the 8.5 inch is one of those long compensators

The one of the left is a 10.5 inch, the middle is a 9 inch AAC, and the one on the right is a 8.5 inch, the barrel recesses into the rail a good 1-1.5 inches, but the comp is really long. I have an extra 7.62 51t sitting around, maybe i'll mount it just for a pic. IF you look closely, the shoulder of the barrel before the threading is right before the 2nd hole in the rail.

Posted: 10/23/2015 12:43:53 AM EDT

[#5]

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Quoted:
http://i9.photobucket.com/albums/a72/disgookonfiya/304AF7F2-B5CC-49D3-BCD5-BE0AF96C2686_zpsb14xl4wf.jpg

This picture really doesn't do it justice, b/c of the flash hider on the 8.5 inch is one of those long compensators

The one of the left is a 10.5 inch, the middle is a 9 inch AAC, and the one on the right is a 8.5 inch, the barrel recesses into the rail a good 1-1.5 inches, but the comp is really long. I have an extra 7.62 51t sitting around, maybe i'll mount it just for a pic. IF you look closely, the shoulder of the barrel before the threading is right before the 2nd hole in the rail.

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What FDE stock is that in the middle? Is that the new Magpul CRT with the battery compartment or a Vltor?

Posted: 10/23/2015 12:59:46 AM EDT

[#6]

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Quoted:

What FDE stock is that in the middle? Is that the new Magpul CRT with the battery compartment or a Vltor?

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Quoted:

Quoted:
http://i9.photobucket.com/albums/a72/disgookonfiya/304AF7F2-B5CC-49D3-BCD5-BE0AF96C2686_zpsb14xl4wf.jpg

This picture really doesn't do it justice, b/c of the flash hider on the 8.5 inch is one of those long compensators

The one of the left is a 10.5 inch, the middle is a 9 inch AAC, and the one on the right is a 8.5 inch, the barrel recesses into the rail a good 1-1.5 inches, but the comp is really long. I have an extra 7.62 51t sitting around, maybe i'll mount it just for a pic. IF you look closely, the shoulder of the barrel before the threading is right before the 2nd hole in the rail.

What FDE stock is that in the middle? Is that the new Magpul CRT with the battery compartment or a Vltor?

Fde stock is s magpul str, one on the left is a b5 sopmod and the right is a lmt sopmod

Posted: 10/23/2015 1:41:43 AM EDT

[#7]

8.5" i like mine but I noticed quite a bit of unburnt powder. Had I to do again I'd go 9-9.5" hell maybe even 10".

Posted: 10/23/2015 2:38:28 AM EDT

[#8]

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Quoted:
8.5" i like mine but I noticed quite a bit of unburnt powder. Had I to do again I'd go 9-9.5" hell maybe even 10".

http://i1319.photobucket.com/albums/t677/balloo933/DSC01801_zpshrw7hc3m.jpg

http://i1319.photobucket.com/albums/t677/balloo933/71e8ec07-130b-4d03-b63a-ec08dcb5d7ec_zpskwiqg5ky.jpg

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Had I mine to do again I would go 9" over the 10.3" BA I have now. Not sure why I even went with the 10.3"...lol.

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Posted: 10/23/2015 2:38:44 AM EDT

[#9]

Quote History

Quoted:
8.5" i like mine but I noticed quite a bit of unburnt powder. Had I to do again I'd go 9-9.5" hell maybe even 10".

http://i1319.photobucket.com/albums/t677/balloo933/DSC01801_zpshrw7hc3m.jpg

http://i1319.photobucket.com/albums/t677/balloo933/71e8ec07-130b-4d03-b63a-ec08dcb5d7ec_zpskwiqg5ky.jpg

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What stock is that?

Posted: 10/23/2015 8:18:17 AM EDT

[#10]

Looks like a vltor imod

Posted: 10/23/2015 11:07:30 AM EDT

[#11]

I went 10.5 because I accidentally bought that one instead of the 8.5"

Posted: 10/23/2015 1:45:23 PM EDT

[#12]

8.5"

Posted: 10/23/2015 6:43:50 PM EDT

[#13]

Quote History

Quoted:
8.5" i like mine but I noticed quite a bit of unburnt powder. Had I to do again I'd go 9-9.5" hell maybe even 10".

http://i1319.photobucket.com/albums/t677/balloo933/DSC01801_zpshrw7hc3m.jpg

http://i1319.photobucket.com/albums/t677/balloo933/71e8ec07-130b-4d03-b63a-ec08dcb5d7ec_zpskwiqg5ky.jpg

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Are you getting powder with all rounds or certain ammunition?

Posted: 10/24/2015 6:09:46 AM EDT

[#14]

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Quoted:

What stock is that?

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Quoted:

Quoted:
8.5" i like mine but I noticed quite a bit of unburnt powder. Had I to do again I'd go 9-9.5" hell maybe even 10".

http://i1319.photobucket.com/albums/t677/balloo933/DSC01801_zpshrw7hc3m.jpg

http://i1319.photobucket.com/albums/t677/balloo933/71e8ec07-130b-4d03-b63a-ec08dcb5d7ec_zpskwiqg5ky.jpg

What stock is that?

Vltor Modstock.

dan1802

[Jump To Reply]Quoted:
8.5" i like mine but I noticed quite a bit of unburnt powder. Had I to do again I'd go 9-9.5" hell maybe even 10".

http://i1319.photobucket.com/albums/t677/balloo933/DSC01801_zpshrw7hc3m.jpg

http://i1319.photobucket.com/albums/t677/balloo933/71e8ec07-130b-4d03-b63a-ec08dcb5d7ec_zpskwiqg5ky.jpg

Are you getting powder with all rounds or certain ammunition?

More so with Gemtech subs suppressed.

Posted: 10/24/2015 9:15:30 AM EDT

[#15]

I went with the 10.3 for a couple of reasons...

1) I wanted to get slightly better supersonic ammo performance

2) I wanted the longer handguard length - it just feels better to me.

Here is a pic of the upper - it was on my pistol lower at the time as my stamp was not approved at that time. It's wearing the Specwar 7.62 mount, and MI handguard...

Bob S.

Posted: 10/24/2015 9:18:54 AM EDT

[#16]

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Quoted:

More so with Gemtech subs suppressed.

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Quoted:

dan1802:
Are you getting powder with all rounds or certain ammunition?

More so with Gemtech subs suppressed.

From what I've seen, it's pretty common with most subs. In my 8" I've had unburnt powder remnants with the following subs: Remington, Gemtech, my own handloads.

It's no big deal.

As for the OP, the shorter the better -- really.

My 8" dedicated subsonic build:

Posted: 10/24/2015 4:45:29 PM EDT

[#17]

is that a 9mm or 45 octane?

Posted: 10/24/2015 6:16:21 PM EDT

[#18]

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Quoted:
is that a 9mm or 45 octane?

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Octane 9.

Posted: 10/24/2015 7:04:49 PM EDT

[#19]

I'm planning on using this one (7.5") on my 300 BLK build:

http://faxonfirearms.com/7-5-govt-socom-300-blk-pistol-length-4150-qpq/

I'm considering this one (6.25") as well, since it would always be run suppressed:

http://www.kakindustry.com/ar-15-parts/upper-parts/barrels/300-blk/6-25-inch

SLR makes handguards that will work with either one.

300 BLK is made to run with short barrels. Why anyone would go longer than 8" is beyond me.

Posted: 10/26/2015 4:48:16 PM EDT

[#20]

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Quoted:
I'm planning on using this one (7.5") on my 300 BLK build:

http://faxonfirearms.com/7-5-govt-socom-300-blk-pistol-length-4150-qpq/

I'm considering this one (6.25") as well, since it would always be run suppressed:

http://www.kakindustry.com/ar-15-parts/upper-parts/barrels/300-blk/6-25-inch

SLR makes handguards that will work with either one.

300 BLK is made to run with short barrels. Why anyone would go longer than 8" is beyond me.

View Quote

Because, as stated above, some may want longer handguards because they allow them to extend out their supporting arm/hand further, it gives more real estate/options for mounting accessories, and also an extended sight radius, an increase in MV, which may give an additional ~50yds (or more) of expansion range with some bullets, etc.

Hell, they may just prefer it that way.... because.

Different strokes and all that...

Posted: 10/30/2015 12:59:39 AM EDT

[#21]

I went from 10.5 to 8.5, and right back to 10.5.

I have moderate hearing damage already. Even with my 762SdN6 I noticed a crack to a number of rounds- Gemtech more than others.
My 10.5 was nice and quiet, just like I like it.

Posted: 10/30/2015 2:41:48 AM EDT

[#22]

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Quoted:
I'm considering this one (6.25") as well, since it would always be run suppressed:

http://www.kakindustry.com/ar-15-parts/upper-parts/barrels/300-blk/6-25-inch

SLR makes handguards that will work with either one.

View Quote

I'd really like to hear about the KAK 6.25 300BO barrel. Add a short SLR handguard and the LAW tactical folder. Hmmmm.

Posted: 10/30/2015 11:45:20 AM EDT

[#23]

Quote History

Quoted:
Because, as stated above, some may want longer handguards because they allow them to extend out their supporting arm/hand further, it gives more real estate/options for mounting accessories, and also an extended sight radius, an increase in MV, which may give an additional ~50yds (or more) of expansion range with some bullets, etc.

Hell, they may just prefer it that way.... because.

Different strokes and all that...

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Quote History

Quoted:

Quoted:

I'm planning on using this one (7.5") on my 300 BLK build:

http://faxonfirearms.com/7-5-govt-socom-300-blk-pistol-length-4150-qpq/
I'm considering this one (6.25") as well, since it would always be run suppressed:
http://www.kakindustry.com/ar-15-parts/upper-parts/barrels/300-blk/6-25-inch
SLR makes handguards that will work with either one.
300 BLK is made to run with short barrels. Why anyone would go longer than 8" is beyond me.

Because, as stated above, some may want longer handguards because they allow them to extend out their supporting arm/hand further, it gives more real estate/options for mounting accessories, and also an extended sight radius, an increase in MV, which may give an additional ~50yds (or more) of expansion range with some bullets, etc.

Hell, they may just prefer it that way.... because.

Different strokes and all that...

Yes, you're right of course, and I should have read all of the preceding posts more carefully before I came off sounding like a jerk.

Posted: 10/30/2015 6:11:26 PM EDT

[#24]

6" is the way to go if you don't plan on shooting over 100yds on game animals. Does fine at 200 for paper punching.

Posted: 10/30/2015 6:33:36 PM EDT

[#25]

Quoted:
Help me decide on a barrel length.
Going to sbr one of my lowers and build a 300 blk. It will not be suppressed right away but maybe down the line.
Will likely hunt hogs and deer with it and of course use it as a range toy/home defense.
I like the looks of a 8.5 but am unsure or the advantages/disadvantages of either.
Would the 10.5 have better bullet stability?
Also, post pictures of yours too help me decide

View Quote

If - and that's just an if - bullet stability is going to be an issue due to crappy factory ammo or d*cked-up handloads, then a longer barrel will generally be better than a shorter one, ... especially if there's a can hanging off the end.

That said, I went with a 10.5" tube for my .300BLK MRP build - because I'm already heavily invested in LMT's MRP platform, and that's the shortest length LMT offers. And to date, I've put 300 issue-free rounds thru it.

Pic below: 10.5" .300BLK; SDN-6 can; Burris LRS 1x-4x in ADM mount; mostly MagPul everything else ...