Quote:

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The single and double set triggers of the 'prewar' MS rifles and carbines interchange. If you can find an original 'prewar' MS trigger of either the single or DST in good condition (or new), it's a 'drop in' replacement.

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Not a chance.

I think it might just need some minor adjustment. I am guessing it used to work. Perhaps even a clean? Maybe a build up of grease or oil? Or some adjustment screw shifted during shipment? Or some person fiddled with it somewhere along the route?