Home Forums Hunting & Shooting AR and Tactical Rifles Home Defense 300BLK SBR Questions

Are you wanting advice on how to tune it, or what parts to use, or ??
Are you handloading or buying factory ammo?

FWIW, I already decided to go with an AR style SBR in 300BLK for this single purpose weapon. That's why I framed my original question as I did. All I was really looking for was advise on setting up such a rifle with regard to the gas system to "tune" it for the best balance of recoil, muzzle jump, ejection site gas, and cycling reliability. Within that framework, I do appreciate the advice on the supers vs subs, because it does impact the noise and would impact the gas system. It's hilarious how guaranteed it is to start with such a non assuming thread and it ends up in a death match. That's the way of the Campfire though

7.5 inch, #31 drill gas port in the pistol position, PRI adjustable gas block....if you like light barrels, JPR .936 adj gas bock if you like heavy barrels.

Just wondering if people had experience to share with adjustable gas blocks and whether it worked well or if they would recommend just buying a weapon already custom built for this purpose. I'm also wondering if people find that the adjustable gas blocks have to be re "tuned" over time due to things like carbon build up in the tubing and a suppressor affecting back pressure. Not sure about factory or hand loading but either way, I will likely make a pick of a load/road and just keep it consistent. I'd rather have consistent behavior and leave the low moa pursuit to my longer range rifles.

You don't have to tune anything at this point in the BO game. Buy quality parts from a reputable company and use the Barnes VorTX ammo. Pistol-length gas and just a plain-ol fixed gas block. I currently have barrels from Noveske and AAC that have both been flawless with that configuration. I'm running standard CAR buffers. I started out a BO skeptic, but am now a huge fan. Deer hunting with mine tomorrow, too.

What made you a huge fan?





Dave

Maybe you should do the same and list your experience.

Don't shoot much 9mm, 40, 5.56, 300BO, or 7.62..... Though 10k rounds per man per month certainly "isn't" much.....








Never even seen a 5.56 or 300B0, nor anything else....

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the 10.5 inch barrel 223 with a 55 grain bullet at 2500 FPS or so indoors at spitting distance is interesting, but I got to think a 55 grain 223 at 3100 FPS within the same distance would produce slightly better results. The pistol caliber carbine in 45 ACP I am thinking real benefit would be a few dB's lower should you not be able to get your ear pro on. Just sayin is all. I don't dispute the effectiveness differences.

Pistol calibers in pistols are handy.

Pistol calibers in carbines give you an unhandy pistol.

Here's a quote from Michael J. Durant from the book IN THE COMPANY OF HEROES;

"I aimed the CAR-15 and pulled the trigger, and the burst of automatic fire took me by surprise. Randy had put the weapon on burst mode and I hadn't checked it, but it sure was effective. One moment the Somali's head was there, and the next moment he was gone. I can't say for certain but I think I killed that man.

I looked at the weapon in my hands and thought, This is what we need, not that MP-5 piece of crap. The heavier bangs of 5.56 mm ammo seemed much more effective than the 9mm "pops" from my MP-5."

end quote.

I don't know but given the same size, I'll take a bigger cartridge.

Carry on.