USGI M14 Parts. A what to look for and Identification Guide.

the SEI rifles were built under government contract, thus are USGI.

Yes I am aware of this, however as stated in the first post this is about the original manufacturers and their sub-contractors during original production runs. With SEI rifles being made in the early 2000's that's hard to be considered "original".
 
@Different, so the "T" in HRT was for Textile Machine Works, and the "W" in HRA-W was for Wright Manufacturing. Is it known if the "N" in HRN, or HR-N was another sub contractor? like New Haven Clock?. And can we assume anything marked HRA or H&R or HR was actually produced at H&R?

Thanks

CeeJay

Yes

HR-N was a subcontractor but its identity has not been determined to my knowledge.

Yes. The main plant for Harrington & Richardson was located at Park Avenue and Chandler Street Worcester, Massachusetts. In the early 1960s, it had three other manufacturing facilities for the M14 project, Gardner and Rochdale, Massachusetts and Elm Grove, West Virginia. Four M14 parts were made at the Gardner location (I don't know what four parts). The West Virginia operation opened in late 1962 to manufacture M14 operating rods. Heywood-Wakefield, one of ~ 140 subcontractors to H &R, was also located in Gardner, MA.

If you don't have it, Bill Ricca and I were able to confirm K8 (safety marking) was Killeen Machine & Tool Co (Worcester, MA). KMT also manufactured trigger guards, magazines, operating rod spring guides and butt plate assemblies. John Bath Co. (Worcester, MA) providing tooling support to Harrington & Richardson.
 
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Suggested note updates for commercial trigger housings:

Springfield Armory, Inc. trigger housings with no markings were manufactured by Wayne Machine, Inc. (Taipei, Taiwan).

Additional markings for Springfield Armory, Inc. trigger housings were 7267030-G and 7267030-H.
 
Suggested note updates for commercial trigger housings:

Springfield Armory, Inc. trigger housings with no markings were manufactured by Wayne Machine, Inc. (Taipei, Taiwan).

Additional markings for Springfield Armory, Inc. trigger housings were 7267030-G and 7267030-H.

Thank you kindly Lee, updates have been added.
 
What about the 0 marking on the receiver
I was told that it means that the rear sight
zero's and was rebuilt if it didn't on the range
 
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