Don't have the exact answer for ya here as possibly it may have been rebarreled at one time and had a bolt change.
I can say this however .....
Theres certainly "nothing" wrong with what you have there and especially with a TRW bolt.
I'm sure that someone with more knowledge that I will chime in here soon with some straight forward facts as to what S/A may have used back then but in the meantime a TRW bolt and Harrington & Richardson barrel is okay in my book ..... :wink:
A forum community dedicated to M14 and M1A Rifle owners and enthusiasts. Come join the discussion about optics, ammunition, gunsmithing, styles, reviews, accessories, Modern, Devine, SOCOM, EBR, classifieds, and more!