Early receivers without the 7th round correction or "low guide ribs" are often difficult to find and the best choice for a gas trap restoration. Both of these two receivers are in the early 40 thousand serial range. There is a special interest among a few collectors in the "extra wide rib" receivers, not many have been located and most have had the correction to the guide ribs.
The photos show one of the receivers (with the white chamber flag) with the low extra wide guide rib and the other receiver with the normal production (at that time period) low guide rib.Information
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