Why would a Miller single selective trigger be added?: Because it's what the owner wanted. The dead giveaway is the engraved "SAFE" from the factory is still there & the safe position lines up with the stamped "S". If it was special ordered with the Miller selective trigger there would be no engraved "SAFE" position. Only the R,L,S. I'd say that about 95% of the Miller triggers on Parkers were sent back to Miller by the owners. They were much simpler than the Parker single triggers & were pretty reliable. You can still have Miller trigger installed today, but they no longer do the selective trigger on the top tang. Only the little rocker selective on the front of the trigger. I've owned several of each & the selector of the front of the trigger was a more positive setup
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