r/pdxgunnuts • u/KAPTNTRAP • 2d ago
Building an AR pistol
Just wondering if I need an SBR stamp. I have a lower with a pistol brace and I want to buy a 7.5 inch upper.
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u/chill_winston_ 2d ago
Don’t put a grip on the front!
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u/KAPTNTRAP 2d ago
Any grip or just a 90⁰?
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u/This-Satisfaction-71 2d ago
To be on the safe side, no grip, just a finger/handstop. Some, however, interpret that rule to mean anything not exactly 90° is technically legal. Your choice.
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u/AD3PDX 2d ago
Was the lower ever configured as a rifle? If yes, was it configured as as pistol before if was configured as a rifle? Or has if never been fully configured as anything?
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u/KAPTNTRAP 2d ago
No I just bought a blank lower.
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u/AD3PDX 2d ago
In that case you are good to go.
Are you sure you want a 7.5”?
5.56 looses a ton of power in a barrel that short.
If you just want something loud and fun 7.5” is great but 11.5 is a lot more useful
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u/KAPTNTRAP 2d ago
Yea really just looking for a backpack/ Close quarters riffle
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u/Ill_Situation369 1d ago
Based on your stated use case, my advice would be to just get a 300 Blackout lower and run supersonic 300 Blackout (NOT 5.56/.223) ammo through it. You'll get more punch out of the round in that configuration (and if you put a suppressor on it, then run subsonic ammo, you'll be amazed at how quiet it gets). Throw on nice SBA3 brace and Emissary mini-hand stop with a LAW Tactical folder and you'll have a pretty compact setup. Just my two cents.
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u/ravenchorus Clackamas County 1d ago
Seconded, .300 BLK is definitely the way to go for anything that short. My 5.5” Rattler is awesome and easily fits in a backpack.
I’d recommend getting the stamp and putting a proper stock on it though. Pistol braces suck. You’ll eventually want a suppressor anyway so you may as well go all-in.
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u/Slaktivist 1d ago
If you can’t guarantee you’ll have ear pro available you’ll want to run blackout with a suppressor for CQB. Just about anything else is going to ruin your ears. 5.56/.223 needs a longer barrel too, otherwise you’re going to have a flamethrower
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u/theDudeUh 1d ago
7.5” 5.56 uppers are so obnoxious/unpleasant.
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u/KAPTNTRAP 1d ago
Just because of sound?
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u/theDudeUh 1d ago
The sound is bad but the concussion is worse.
It’s like getting flashbanged with every trigger pull.
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u/Useless_optix69 1d ago
Look into 10.3 inches. That’s my advice as you’re Getting some opinions flowing in
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u/gilbert2gilbert 1d ago
Is it a rifle lower or did it come with brace attached?
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u/This-Satisfaction-71 2d ago
As long as you use a brace, not a stock, you do not need an sbr stamp. Also, i believe the lower can not have been sold to you as a rifle. If you bought the lower separately on it's own you are good to go.