I've seen No1 and 4 mags converted to single stack for 303 Epps conversions as they won't feed double stacked in a standard mag housing since they're wider at the neck. Guide plates were soldered internally to both sides of the mag casing at the rear; then a model 10 Ross platform and spring was used. It should be fairly easy to come up with a Ross platform and spring. Hope this helps. Ron
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