Either bolt was acceptable for use in either modelĭuring Ordnance inspection and rebuild operations. The Model M1 Carbine and was simply the standard when the M2 Carbine Later introduced the round bolt had already been in use with production of Has become commonly known as "the round bolt".Ĭontrary to widely circulated rumors, the round bolt was not specificallyĭesigned for use with the select-fire Model M2 Carbine. The most obvious change to the bolt being the elimination of the lightening cut along the top of the bolt that changed the bolt design to round instead of flat, this bolt With the bolt (refer to the type V slide with part number 7160091). These changes included five changes to the bolt design and changes to the slide in relation to how it interacted Army Ordnance standardized a number of design changes to various parts for the U.S. If the two are intermingled these surfaces should be inspected regularly as wear or damage in theseĪreas can remove this important safety feature. Use of a commercial hammer or bolt with a GI hammer or bolt is not recommended. The rear of the commercial bolts made by many different manufacturers post WWII were/are not hardened to The rear of the bolt and face of the hammer were hardened to operate as a matched set. The firing pin (A) until the bolt rotated into the locked position and was ready for firing (B). The rear of the bolt and face of the hammer were designed to prevent the hammer from contacting By mid 1942 a web (black arrow) was added underĮxtractor to strengthen the right bolt lug.
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