I think it's a 2BA, but you know it's so close to 10-32, I just retapped the silencers out with a 10-32 bottom tap, the button head Allens are easy to come by, even in stainless. Oh, No, I've ruined it.
The originals (left) are 2BA, I cut some from longer 10-32 (right) but if you use the 10-32 the silencers really have to be re-tapped. 1/4" will do, no longer.
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