.300 Blackout Build

05dodgedaytona · Apr 8, 2018

I'm getting some parts together for my .300 Blackout build. What do you guys recommend for a barrel and gas block? I will probably use my Spikes snowflake lower for this build with either a CMMG or Spikes LPK. I will be getting a stripped spikes upper for it. I'm also looking for hand guard and muzzle break suggestions. Thanks in advance.

teratos · Apr 8, 2018

I would use an SLR Rifleworks adjustable gas block. Can't answer the barrel question. I went with Noveske and it has been a flawless performer.

outrider58 · Apr 8, 2018

What kind of build are you thinking? Rifle, pistol(yes!), carbine, SBR? Suppressed? What's the gun to be used for? HD, range toy, hunting?

teratos · Apr 8, 2018

Oh, and take a look at the Geissele LPK. Nicest I've worked with.

05dodgedaytona · Apr 8, 2018

It will be a 16" barrel. I probably won't build this one for suppressed. I will do another build for suppressed since I don't have a silencer for .300 blackout yet. Not even sure what silencer I would want plus not sure if I want to use my trust for one or just go the individual route.

BradMacc82 · Apr 8, 2018

Few years ago, used Noveske barrels for both of my 300BO's. Aside from having the feed ramps slightly opened up to guarantee them big ol' subs fed reliably, they were as I received them - even used the supplied gas blocks. Both shot very well, 16" was genuinely MOA or better. 12.5" was also no slouch as well. Sold both of them off though. Firearms ADHD is a cruel mistress.

No idea if the quality of Noveske 300BO barrels has stayed the same, or dropped off - but a few years ago, they were solid performers.

outrider58 · Apr 8, 2018

BradMacc82 said:
Few years ago, used Noveske barrels for both of my 300BO's. Aside from having the feed ramps slightly opened up to guarantee them big ol' subs fed reliably, they were as I received them - even used the supplied gas blocks. Both shot very well, 16" was genuinely MOA or better. 12.5" was also no slouch as well. Sold both of them off though. Firearms ADHD is a cruel mistress.

No idea if the quality of Noveske 300BO barrels has stayed the same, or dropped off - but a few years ago, they were solid performers.

I've got a Rainier 10.5 Ultramatch on my SBR. Shoots jagged wholes @ 100 yds using my supers. It did require opening up the gas port to cycle subs reliably though. They now have the Ultramatch Mod2 now. Maybe they took care of that.

BradMacc82 · Apr 8, 2018

outrider58 said:
I've got a Rainier 10.5 Ultramatch on my SBR. Shoots jagged wholes @ 100 yds using my supers. It did require opening up the gas port to cycle subs reliably though. They now have the Ultramatch Mod2 now. Maybe they took care of that.

Armed Ferret had nothing bad to say about the tubes he got from Rainier, so that's a positive on it's own.

Got lucky with the Noveskes, gas-ports were untouched - but both ran pistol length gas systems. Adjustable blocks weren't as great when I built those 2 uppers out, lots of issues with fouling, IIRC. So Chad just worked up what buffer spring buffer I should run if I wanted to shoot subs or supers and have it be reliable.

Still have the videos of him testing the 16" out with HIS suppressor at Scott's. Doesn't seem all that long ago...

outrider58 · Apr 8, 2018

Springs can be tricky when tuning 300s. I started out with a carbine spring and had spotty luck locking open on empty chambers(I was also working up sub loads at the same time). Then I tried a Nemo 300 Blk spring. It ran subs great, but if you tried supers in it, it beat the hell out of the gun. Next up, Tubb's new 300Blk spring. Now I'm not sure of the timing, Chad, at about that time, was at the Dottrio shoot in Fredneck and did the gas port work in his trailer. I took the gun inside Heritage right then and there and it ate like a chubby baby. The whole gun was build in his build class and I spared no expense on parts including SLR pinned GB. Gun has been flawless ever since. :thumbsup:

05dodgedaytona · Apr 8, 2018

Thanks for the info. Should I make sure I get a pistol length or carbine length?

outrider58 · Apr 8, 2018

05dodgedaytona said:
Thanks for the info. Should I make sure I get a pistol length or carbine length?

Pistol

BradMacc82 · Apr 8, 2018

outrider58 said:
Pistol

times 2.

05dodgedaytona · Apr 8, 2018

That limits barrel manufacturers since not all of them make pistol length gas systems. I'm starting to lean towards a Noveske barrel.

05dodgedaytona · Apr 8, 2018

Has anyone used Ballistic Advantage Barrels before? I have never heard of them.

BradMacc82 · Apr 8, 2018

05dodgedaytona said:
Has anyone used Ballistic Advantage Barrels before? I have never heard of them.

They have a decent barrel, and by decent, I mean slightly better than average.

I'm not a fan of the Performance/Premium series, simply due to the NiB extension. The Modern series shoot just as well as the Performance series, only w/out the NiB barrel extension. And for less money.

woodline · Apr 8, 2018

Personally I would go with Rosco Manufacturing over Ballistic Advantage. They do pistol length gas too. I think BA's QC has slipped since they got bought out by Aero.

https://www.roscomanufacturing.com/shop/blood-line-barrels/bloodline-16-300-blackout/

CZ4ME · Apr 9, 2018

I bought a 16" HBAR Upper assembly from MAS Defense. Its fitted to a Ruger Lower, w/Daniel Defense lower kit, everything came together @reasonable price. I put about 100rds through it so far. I like it!

outrider58 · Apr 9, 2018

05dodgedaytona said:
That limits barrel manufacturers since not all of them make pistol length gas systems. I'm starting to lean towards a Noveske barrel.

I would not waste the extra money on the "head-spaced" bolt. There is no guarantee it will meet spec in your BC and gun combination.

DaemonAssassin · Apr 9, 2018

The KAK Value Line 300BLK barrel has been a good performer for a friend of mine on his deer rifle. A good barrel for 100 bucks is hard to pass up.

https://www.kakindustry.com/ar-15-p...h/contract-300-16-inch-pistol-melonite-barrel

05dodgedaytona · Apr 13, 2018

Thanks for all the replies.

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