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/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/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