Originally posted by u/Dude_I_got_a_DWAVE at 2025-06-30T18:32:57Z

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Im developing an Auto9 prop for my old 92S. A 0.75” OD steel tube will inserted into the hole and overlap the barrel with 1mm clearance. I’ll grind a lead-in and ports prior to press fit/gluing/(pinning?) it in place. The steel tube will extend ~10mm from the end of the prop assembly. The prop will be held in place by a cross screw inside the trigger guard…..and a shoulder bolt screwed into the tip of the aluminum recoil spring guide, tapped for M4. The shoulder bolt head will prevent the prop from rotating downward during cycling. Also considering putting a cross bolt through the front web of the trigger guard.