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Subsonic .300 blackout ammo cycling an AR pistol Login/Join 
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I’m thinking about building a pistol in .300 blackout and I’d like for it to reliably cycle subsonic ammo without a suppressor. I’ve read that the PSA uppers will do that and I was leaning towards one of their uppers. Any thoughts?
 
Posts: 1541 | Location: Kentucky | Registered: December 05, 2011Reply With QuoteReport This Post
Stangosaurus Rex
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I have a PSA 300 blackout pistolero with a 10.5 inch barrel and have had nary an issue! I've shot both sub and super.


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Beth Greene
 
Posts: 7849 | Location: South Florida | Registered: January 09, 2011Reply With QuoteReport This Post
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Same. With or without a suppressor, my 10" PSA upper works with everything. Maybe it's due to the carbine length gas system.
 
Posts: 313 | Location: Pa | Registered: September 20, 2007Reply With QuoteReport This Post
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If you go shorter than 10.5, it's probably going to have a pistol length gas setup.

With that, use an H2 buffer and see how it goes. I have had no issues with my 7.5 cycling subsonic without a suppressor with an H2 buffer. I haven't tried a standard carbine buffer.
 
Posts: 1441 | Location: County 18, OH | Registered: April 11, 2007Reply With QuoteReport This Post
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