N/A Mac 1 USFT # 233

I think you're after a 010 cast polyurethane, 90D. Based on mine.

Since they're all kind of bespoke and generally speaking, I've seen lots of variations from one USFT to the next. For that reason, I'd recommend that you check the specs of those 010s and the groove on your gun before you order. There are USFTs with the oring on the barrel and others with it on the swing breech.
 
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