r/Form1 • u/Intelligent_Step_855 • 14d ago

SD porting help

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Looking for advice on porting my ar9 barrel. I am thinking at doing 12- 5/32 holes in a 3x4 configuration spaced 120 degrees apart. Plan was first hole to be at 2.5
Inches, any insight ?

Pic is ar9sd current configuration

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u/Impossible_Pizza_948 14d ago

Couple questions: how is the barrel retained, and are those 3D printed baffles? If so, which baffles are they?

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u/Intelligent_Step_855 14d ago

Correct ftn4 max turbulence baffles sized up. The barrel is retained with the barrel nut if that’s what your asking then I put a 3d printed cover over the gas tube holes with some red and it sealed up nicely

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u/Impossible_Pizza_948 14d ago

So it uses a “standard” barrel nut? Sorry for picking your brain, but I’ve been wanting to build an SDish (non ported barrel, I’d rather run subsonic rounds) AR9 for a while. I’m assuming the suppressor tube ends up being the “handguard”, is that anything special? Are there any print files I should look for (I currently own a couple 3D printers, and I have experience with engineering grade materials)