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In regard to Remington 03A3 2 groove and 4 groove production, from what I have read on the various forums it appears as if the following applies :

(Please correct me if I have this wrong)
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I have also joined the 03a3 Remington Club recently.

One thing I have noticed is that the rear screw which attaches the barreled receiver to the stock is too short to engage all the threads.... ...