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Rafman
Site Supporter
Location: Woodinville Joined: Thu May 12, 2016 Posts: 341
Real Name: Rafael
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Was considering building a 300AAC with a 10.5 barrel using an Aero upper, lower, and atlas handguard. I don’t currently have anything else in this caliber but wanted to do a pistol length AR. Then I come across this in an email. http://palmettostatearmory.com/psa-7-5- ... 3a00+EmailThoughts? Any pros or cons with this barrel length? Figured I can try this one out and eventually build one to my liking if I like it or want to do something different. Don’t have a suppressor yet, but something I will eventually do
Last edited by Rafman on Tue Jan 09, 2018 11:01 am, edited 1 time in total.
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Tue Jan 09, 2018 9:10 am |
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RocketScott
Site Supporter
Location: Kentucky Joined: Fri Jan 16, 2015 Posts: 11124
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If you plan on running a suppressor check to see what it's rated to.
I have a Recce7 and it's 'rated' down to 8" for 300BLK although I'm sure it would be fine on a 7.5" with subs.
I currently have it on a 8.5" upper and it ends up being a little shorter than a standard 16" upper.
_________________ You may be right, I may be crazy, but it just may be a lunatic you're looking for
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Tue Jan 09, 2018 9:23 am |
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Nitro_Guns
Site Supporter / FFL Dealer
Location: Lynnwood Joined: Mon Mar 14, 2011 Posts: 2499
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My son and Daughter In Law just purchased 2 complete PSA uppers in 5.56......Neither one of them operate more than a single shot. Swapped one of my uppers on their lowers to make sure it wasn't an issue with lowers....Nope ran perfectly. Not sure what the problem is but it is pretty sad that 2 brand new "factory assembled" uppers do not operate.....just a for what it is worth.
_________________ aka Big_Daddy
Nitro Products FFL Dealer SOT Dealer
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Tue Jan 09, 2018 9:54 am |
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beckdw
Site Supporter
Location: Tri -Cities Joined: Thu May 23, 2013 Posts: 2798
Real Name: David
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RocketScott wrote: If you plan on running a suppressor check to see what it's rated to.
I have a Recce7 and it's 'rated' down to 8" for 300BLK although I'm sure it would be fine on a 7.5" with subs.
I currently have it on a 8.5" upper and it ends up being a little shorter than a standard 16" upper. This^^^^ Also, my dad has their 8", and it runs like a top. No problems on an Anderson lower with PSA parts kit.
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Tue Jan 09, 2018 10:46 am |
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sigman226
Location: Oly Wa Joined: Fri Aug 10, 2012 Posts: 614
Real Name: Rick
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I have 1n 11.5" PSA upper in .223/5.56 and no problems.
_________________ Keep your booger picker off the bang switch till its go time! Walk tall and carry a big Sig!
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Tue Jan 09, 2018 11:11 am |
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Ops
Site Supporter
Location: Piece/Clallam Joined: Wed Oct 17, 2012 Posts: 10688
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just don't mistake your rounds.
ps ill take your uppers and see whats wrong. could be gas block not on right is all
_________________Yaki's - last journeyPromote a Growth Mindset. Don't let a fixed mindset not allow change for the better.
pow·er trip - noun - a self-aggrandizing quest for ever-increasing control over others.
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Tue Jan 09, 2018 12:03 pm |
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MadPick
Site Admin
Location: Renton, WA Joined: Sun Mar 13, 2011 Posts: 52120
Real Name: Steve
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I have an 8" 300BLK upper (not from PSA) and mine runs well with my subsonic loads. If you want to use a suppressor and subsonic ammo, then I think the shorter barrels are probably better because they will keep the velocity down (i.e., subsonic) without forcing you to drop the powder charge too low.
Another thought is that if you're going to run a suppressor, you need to make sure you can attach it (thank you, Captain Obvious, haha). So if the end of the muzzle threads are inside the handguard, and the handguard is too small in diameter to "tuck" your suppressor, then you're hosed. I'm guessing from the PSA photo that this is the case here, and you wouldn't be able to attach a suppressor without more work.
_________________SteveBenefactor Life Member, National Rifle AssociationLife Member, Second Amendment FoundationPatriot & Life Member, Gun Owners of AmericaLife Member, Citizens Committee for the Right to Keep and Bear ArmsLegal Action Supporter, Firearms Policy CoalitionMember, NAGR/NFGRPlease support the organizations that support all of us.Leave it cleaner than you found it.
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Tue Jan 09, 2018 12:07 pm |
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Rafman
Site Supporter
Location: Woodinville Joined: Thu May 12, 2016 Posts: 341
Real Name: Rafael
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May consider going 223/5.56 just to keep some uniformity. But then I’ll have the nagging feeling of still wanting a 300AAC on hand.
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Tue Jan 09, 2018 12:08 pm |
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Ops
Site Supporter
Location: Piece/Clallam Joined: Wed Oct 17, 2012 Posts: 10688
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also make sure its pistol gas. I've heard they can be finicky. Don't let this be you
_________________Yaki's - last journeyPromote a Growth Mindset. Don't let a fixed mindset not allow change for the better.
pow·er trip - noun - a self-aggrandizing quest for ever-increasing control over others.
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Tue Jan 09, 2018 12:11 pm |
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SporkBoy
Site Supporter
Location: Deckerville Joined: Wed Jan 13, 2016 Posts: 2947
Real Name: Rob
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Factory loads out of a 16" bbl are still subsonic.
_________________ “The Democrats are playing you for a political chump and if you vote for them, not only are you a chump, you are a traitor to your race.”-Malcolm X
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Tue Jan 09, 2018 6:26 pm |
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Wetpaperbag
Site Supporter
Location: olympia Joined: Sat Sep 21, 2013 Posts: 3784
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Nitro_Guns wrote: My son and Daughter In Law just purchased 2 complete PSA uppers in 5.56......Neither one of them operate more than a single shot. Swapped one of my uppers on their lowers to make sure it wasn't an issue with lowers....Nope ran perfectly. Not sure what the problem is but it is pretty sad that 2 brand new "factory assembled" uppers do not operate.....just a for what it is worth. Have you checked the gas block to make sure the rifle is cycling correctly? Might be worth a quick look.
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Tue Jan 09, 2018 6:51 pm |
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Guns4Liberty
Site Supporter
Location: Lynnwood/Bothell Joined: Thu Jul 31, 2014 Posts: 8570
Real Name: Curtis
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Does anyone with a 7.5" or 8" barrel have issues with incomplete powder burn on .300 AAC BLK subs? I know that's an issue with short 5.56 barrels, but not sure if it would be different for .300 considering the loads are quite different.
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Wed Jan 10, 2018 10:17 am |
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beckdw
Site Supporter
Location: Tri -Cities Joined: Thu May 23, 2013 Posts: 2798
Real Name: David
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Guns4Liberty wrote: Does anyone with a 7.5" or 8" barrel have issues with incomplete powder burn on .300 AAC BLK subs? I know that's an issue with short 5.56 barrels, but not sure if it would be different for .300 considering the loads are quite different. Do I ever. I was considering starting a thread on it. I get a lot of powder all over the inside of the ARs. Yet, I lose velocity if I back off the charge...wtf?
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Thu Jan 11, 2018 9:08 pm |
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OhShoot!
Site Supporter
Location: Bellingham Canada Joined: Thu Jan 3, 2013 Posts: 4999
Real Name: Josheewa
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I read that 300 BO was designed for a 10.5-11 inch barrels. Might be why people are getting unburned powder in the shorter 7.5-8 inch barrels.
_________________ It must be frustrating always being the smartest person in the room.-Jagerbomber35
Divided we fall.
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Thu Jan 11, 2018 9:21 pm |
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RocketScott
Site Supporter
Location: Kentucky Joined: Fri Jan 16, 2015 Posts: 11124
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beckdw wrote: Guns4Liberty wrote: Does anyone with a 7.5" or 8" barrel have issues with incomplete powder burn on .300 AAC BLK subs? I know that's an issue with short 5.56 barrels, but not sure if it would be different for .300 considering the loads are quite different. Do I ever. I was considering starting a thread on it. I get a lot of powder all over the inside of the ARs. Yet, I lose velocity if I back off the charge...wtf? What powder are you using? Probably need something that burns faster. All 300BLK that I've seen use pistol length gas systems. Not a lot of time to burn everything up.
_________________ You may be right, I may be crazy, but it just may be a lunatic you're looking for
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Thu Jan 11, 2018 9:43 pm |
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