SBR upper?

GA Firing Line

Laces_Out_Marino

Tracker
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Aug 14, 2015
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I am getting ready to Form 1 my first lower. What is a good caliber to get an upper in for an SBR? I have a 30 cal can so I will want to suppress it also.
 

Red Dawn

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I bounced back and forth between 9mm and 300BLK I'm going with the 300BLK in 8.5 to 10.5 length. Till the SBR paperwork comes back.
 

Leshaire

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Mar 27, 2015
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are you allowed to swap uppers on a sbrd lower?

with the assumption that barrel length/caliber is different than what the stamp has on it...
 

AtlMedic

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Mar 25, 2015
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Probably not what your looking for but my dream SBR would be one of the glock mag lowers.

A 9mm glock mag fed SBR would make me so happy. I know you can't swap out uppers doing that but I still think it would be badass.
 

Red Dawn

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9 = .354
7.62 = .305

I would say no go for that one and be safe.
 

AtlMedic

Not A Doctor
Mar 25, 2015
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9 = .354
7.62 = .305

I would say no go for that one and be safe.

This is why I shouldn't post from work. Little sleep and no coffee makes me say backwards things. I knew it was one way or the other. Thanks for correcting me.
 

Red Dawn

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This is why I shouldn't post from work. Little sleep and no coffee makes me say backwards things. I knew it was one way or the other. Thanks for correcting me.
Small Sacrifice for being a hero and saving lives. Thanks.
 
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NWS

Not a hot midget
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I have a 7.62x39 SBR. It started at 7.5" but I wasn't comfortable with the short barrel and my can so I changed it up to a 10.5" barrel. It does everything my 300 BLK SBR did since I never used subsonic ammo in my 300 BLK. What are your questions?
 

Laces_Out_Marino

Tracker
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Aug 14, 2015
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I have a 7.62x39 SBR. It started at 7.5" but I wasn't comfortable with the short barrel and my can so I changed it up to a 10.5" barrel. It does everything my 300 BLK SBR did since I never used subsonic ammo in my 300 BLK. What are your questions?

Is it worth it? is it reliable on the AR platform?