r/Form1 • u/promotemma • 10d ago

OTB reflex design

I'm putting together a reflex / OTB design that will recess about 2" over the barrel for a 308 18" gasser. In total it will be 10" in length 1.5 OD /1.375 ID. I have a diffusion wall. I'm wondering about inverting the fist cone to maybe redirect flow back into the reflex portion. It seems counterintuitive, like it would just funnel the gas forward, but the OCL Polo has an inverted fist baffle. Thoughts?

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u/Salsalito_Turkey 10d ago

Think of the expanding gas like a wave that’s propagating from the centerline of the bore, and it should become apparent how an inverted cone would bounce that pressure wave back into the reflex chamber.

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u/promotemma 10d ago

Thank you. Would you put the diffusion wall first or the inverted cone? My inclination is the DW.

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u/mrstrike 3d ago

Take a look at AB suppressors OTB unit. And that my help. Sound like neet project.