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M1 Carbine Experts

tomh.
What manufacturer do the initials IU mean on an M1 carbine bolt assy?
Three "experts" at a very large gunshow failed to answer this question today.
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4 comments

Date Votes
  • tomh.
    I know that there were many companies who made magazines for the military and they are marked on the spine. From my limited knowledge they only made 15 and 30 round mags for the military. I have seen on other sites where they are advertised as 10 rounders with military markings. Did the military in fact have 10 round mags or is this just a way to get around the round limitation on other sites.

    Secondly with so many mags out there I know they don't bring much money but are any of them more valuable than others and what would there markings be.
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  • nmyers
    The headspace of an M1 carbine should be checked when changing bolts. Excessive headspace is rarely a problem with these guns, but it still should be checked.

    Personally, I'd leave the flat bolt in there. There's nothing to be gained by switching to a round bolt. They don't look as nice, & are needed only for full auto fire.

    The only thing I'd change is put a M_ magazine catch so that I could use 30 rd magazines.

    Neal
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  • Laredo Lefty
    Either bolt will work on a full auto gun.

    The benefit of the round bolt is a little more bearing surface with the reciever.

    Joe
    "Never let school interfere with your education"
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  • v35
    US rifle bolts are universal and properly fit US rifles without headspace checking. This is why G.I. parts aren't serial numbered.
    Go ahead and swap bolts if you fancy one over the other.
    The only breakage in Carbine bolts occurs through the main locking lug which has been drilled out for the extractor spring and only after souping up rate of automatic fire, oiling ammo etc.
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