What is the optimum barrel length for a .300 Blackout for use in a PDW/Pistol/SBR for suppressor use? I've heard that 10 in. is optimum, but I know there are 7.5 in. versions. What say you?
Optimum Short Barrel length for .300 Black Out?
- Thread starter nortac
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Dunno; mine is a carbine. But I love the round! You will too.
AA
AA
I think most would recommend 10-10 1/2 for gas regulation without suppression, but with, 7.5 probably just fine also.
Edit: I’m thinking.556, you said 300 Blackout. I dunno.
Edit: I’m thinking.556, you said 300 Blackout. I dunno.
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- #4
I was off slightly, 10.5 in.
Picking a 300 Blackout Barrel: Length, Twist and Gas - 80% L❂WERS
Picking a 300 Blackout Barrel: Length, Twist and Gas - 80% L❂WERS
Article said they think 9 inch for .300 gives same ballistics as .556 14”.
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- #6
Yes, but it also states:
"Shooters who prefer shooting subsonic loads with a suppressor more often (and who want greater accuracy) will enjoy a slight benefit by investing in a 10.5″ barrel instead."
Definitely makes sense. 200 grains of silent hog hunting sounds cool. All you’re gonna hear is the thud. 
I built one with a 7.5 inch barrel and use a Liberty Mystic suppressor on it. Function is perfect and with subsonic loads all I hear is the bolt working and then the bullet hitting the target.
I have another 16 inch upper that I use a AAC 7.62SD on and its long enough to be a little unwieldy and subsonic rounds often go super due to the longer barrel length and higher velocity.
The .300 is a handy little cartridge and a short barrel with a can is a lot of fun.
I have another 16 inch upper that I use a AAC 7.62SD on and its long enough to be a little unwieldy and subsonic rounds often go super due to the longer barrel length and higher velocity.
The .300 is a handy little cartridge and a short barrel with a can is a lot of fun.
There is much covetousness going on in my brain here!
You can use either sub or super sonic rounds but I "think" the cartridge was designed for suppressor use and has no more recoil than a 5.56 caliber.
Supersonic rounds are very capable hunting or self defense choices and the sonic crack (with suppressor) they make sounds much like a .22 rimfire round to me.
There are a couple of bullet designs for the .300 that are touted to expand for hunting use but I have not personally tried them. The suppressed subsonic loads are extremely quiet and great for target practice without any hearing loss or disturbing the neighbors etc.
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- #12
Developed to work in the M4 platform as a more effective round than the suppressed 9mm subsonic and as a supersonic round, the ballistic equivalent of the 7.62 x 39.
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- #14
Thinking real hard about a pistol/SBR build. Prolly gonna buy a stripped lower and send in a Form 1. It will take me a good while to build it out, give plenty of time for the Form 1 to process.
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- #16
Rock River's dual stage is a great trigger priced very reasonable.
Thanks, I'll look into it! It will be a challenge not to make this a high end build, but at the same time I don't want to go too cheap, or I'll just replace parts with more expensive ones if I'm not satisfied with just "OK" components.
I hear ya. I think an SBR or pistol shoots better with a 2-stage and the RR is cheaper then Geissele.
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- #18
I was thinking Geissele, just because I want one and I might want to put one in another of my ARs. I also want the pistol/SBR to look really nice, not just another black rifle. Not that you'd really see the trigger. But of course function is everything, appearance is secondary.
Well, Rock River has a really good 2 stage, but it isn't Geissele good for sure.
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- #20
I'm troubled by some recent reviews I saw on the Brownells site re: RR trigger, while some were very positive, others noted some lapses in QC, unfinished parts, breakage, etc. I'd rather buy once, cry once. But thanks for the tip anyways.
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