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Discussion Starter · #1 ·
I just picked up a new TRW bolt , the markings seem to be right but that hand scribed "M" on the underside of the bolt got me , I have seen H&R bolts marked so , but no other maker other then H&R till now , did TRW have a bad run that they needed to be magnafluxed ? or was this done by all ?
 

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I recall these bolts were to be magnetic particle inspected two times, once before heat treating and one after they were final finished. You may be able to find another M under the finish as well as the one visible cut thru the Parkerizing.

I've never seen a UGSI SA M14 bolt, so can't comment on how they were marked. Certainly commercial M1A bolts aren't.

-- Chuck
 
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