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The Range
Gunsmithing & Repairs
Making a 7.62x39 AR-15 work reliably
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<blockquote data-quote="Profreedomokie" data-source="post: 3718089" data-attributes="member: 524"><p>"Many will say why not just use the 300 Blackout. Well, from my experience the 300 Blackout round shares many of the same functional reliability problems as the 7.62×39 round running in an AR-15 unless either caliber are well tuned. Yes, yes, I know your 300 BO rifle runs great, but mine needed tuning to run both subsonic and high velocity rounds. Then there’s the fact that the 300 Blackout is still $1.00 a round compared to $0.40 per .223 round and $0.30 per 7.62×39 round. The 300 Blackout has its place, but a working AR-15 7.62×39 upper can deliver more power for less money–you know, if you can get it working." quoting mtnboomer.</p><p></p><p>I built a 300 Whisper AR15 long before it was called a 300 Blackout. When I built the gun, its purpose was to shoot heavy subsonic bullets only. J.D. Jones of SSK Industries designed the round to be loaded subsonic like all the Whisper rounds. It took a lot of R&D on my part to make the gun function. My gas port is drilled very close to the chamber, my buffer tube is empty, and I run a 9mm recoil spring. The barrel is a 1 in 8" twist which is needed to stabilize heavy subsonic rounds. I don't see how a 300 Blackout with a fast twist barrel is going to shoot both heavy subsonic bullets and light supersonic bullets with good accuracy for both. This is the first I've heard about people having functionally problems with 300 BlackOut ARs. I've owned AK47s and VZ58s and liked both. I replaced both of them with a Sig 556R Gen 2 which I like more.</p></blockquote><p></p>
[QUOTE="Profreedomokie, post: 3718089, member: 524"] "Many will say why not just use the 300 Blackout. Well, from my experience the 300 Blackout round shares many of the same functional reliability problems as the 7.62×39 round running in an AR-15 unless either caliber are well tuned. Yes, yes, I know your 300 BO rifle runs great, but mine needed tuning to run both subsonic and high velocity rounds. Then there’s the fact that the 300 Blackout is still $1.00 a round compared to $0.40 per .223 round and $0.30 per 7.62×39 round. The 300 Blackout has its place, but a working AR-15 7.62×39 upper can deliver more power for less money–you know, if you can get it working." quoting mtnboomer. I built a 300 Whisper AR15 long before it was called a 300 Blackout. When I built the gun, its purpose was to shoot heavy subsonic bullets only. J.D. Jones of SSK Industries designed the round to be loaded subsonic like all the Whisper rounds. It took a lot of R&D on my part to make the gun function. My gas port is drilled very close to the chamber, my buffer tube is empty, and I run a 9mm recoil spring. The barrel is a 1 in 8" twist which is needed to stabilize heavy subsonic rounds. I don't see how a 300 Blackout with a fast twist barrel is going to shoot both heavy subsonic bullets and light supersonic bullets with good accuracy for both. This is the first I've heard about people having functionally problems with 300 BlackOut ARs. I've owned AK47s and VZ58s and liked both. I replaced both of them with a Sig 556R Gen 2 which I like more. [/QUOTE]
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