U.S. Model M1 Rifle Combination Tool

The first model tool consists of a chamber cleaning plug which is slotted for a cleaning patch, screwdriver and a bolt dismounting tool for the extractor and ejector.

The second model tool replaced the cleaning plug with a brass chamber brush.  (See Gun Tools, p. 198)

Our first model specimen is marked "2 S" and "117".  The second model specimen is marked "HO".