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42,447 Posts
300 B/O AR Pistol barrel length?
I'm building a new 300 B/O AR pistol and can't decide between a 7.5" or 10.5" barrel. I currently have a 5.56 AR with the 10.5", but have heard the 300 B/O velocity doesn't differ much with short barrels compared to 5.56. I plan to mount a red dot so sight radius is not a factor.
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4,375 Posts
I have 300BO in 10.5 and 8.5, and 7.5. 556. So what are you talking about not in 556.
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42,447 Posts
Sounds like he’s saying he will not own a short barrel 5.56
Personally, I don’t prefer any 5.56 barrel shorter than 11.5”
Personally, I don’t prefer any 5.56 barrel shorter than 11.5”
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4,375 Posts
I remember you advised me not to go as short as I did and go at least 11.
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25,596 Posts
Should have put I won't own a AR pistol in 5.56 with a barrel under 10.5. You can own as many as you like
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42,447 Posts
Unless it’s a piston driven upper. I have a PWS, it’s a fun range blaster, but that’s about it. I need to sell it
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6,425 Posts
Ditto on 9" being what the ctg. was designed around. I'm running an 8.5" bbl on my pistol but my next Blackout build will probably be either a 10.5" or 11.5" if I can get the barrel that length. Of course be sure to run a pistol length gas system(i.e. 5" gas tube) so you can run sub-sonic without trouble and go with a 1:7" twist to stabilize those heavy bullets.
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1,995 Posts
My 300 BO pistol, jeep gun, sports a 10.5 inch barrel with a Kaw Valley Precision Linear Comp on the end to help with sound redirection. With subsonic ammo the sound level is very tolerable. Heck the 300 sound is tolerable without the Comp on it. Just a lot more so is confined spaces.
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42,447 Posts
Anything you don't like about the KVP linear comp?
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1,995 Posts
Not a thing. I also put one a 6.8 SPC that I use for hog hunting.
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42,447 Posts
Thank you......I like the Noveske I have installed, but would like a lighter device.
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4,375 Posts
My 10.5 BO runs them all just fine. It has a Tubs flat wire heavy spring on a H-2 buffer. Ejections are right at 3:0'clock in a nice little pile about 4-5" dia. from bench. The 8.5 " is good as well. I'm really pleased with the builds.
Looked into the KAW Valley linear comp and like the look and function. I ordered the PSA upper with 7.5" barrel and 7" lightweight M-Lok handguard.
Not to sound flippant, but PSA's daily email yesterday had an 8.5" 300 B/O upper, with 9" M-lok handguard, KAK flash can & M-Bus front & rear sights for only $70 more than I paid for the 7.5" without all the extras. I called PSA cust service and they cancelled my 1st order and are set to ship the 8.5".
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4,375 Posts
Good for you I know you're glade you caught that mail, and could get with cust.ser. in time. Happy for yah:waving:.
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25,596 Posts
Think you will like it. My 300blk upper is from PSA with stainless 8.5" barrel and I think 7" M-lok hand guard. Runs like a top.
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