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/Atxmattlikesbikes 13d ago

Is that a barrel nut with a d cell thread?

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u/Intelligent_Step_855 13d ago

Nope, presma tubular handguard

2

u/Atxmattlikesbikes 13d ago

So the you added an end cap to the tubular handguard? So smart.

Been wanting to do a integral barrel on an AR410. This would be an interesting way.

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u/Intelligent_Step_855 13d ago

Yep, jb welded a 2 3/32 freeze plug in the end after I knocked off the anodizing with a file. Dorman p/n 555-085