You will need a a different baffle that keeps the bolt from going too far back I believe. Not al J series were first geneation short action I beleive. There was a different baffle on the bolt to keep it from going back to far on those made for short action cartridges. I think the mag box is shorter also. I had one in short action mode but cant remember the details. My short action J series 110 had a mounting screw spacing of 4.522 if thats any help. Maybe someone with better info will chime in here.
El Lobo
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