[ARCHIVED THREAD] - Colt vs. LMT bolt difference?

Posted: 12/15/2007 5:02:03 PM EDT

Today I decided to get into the Christmas spirit by taking apart and cleaning my AR's, plus I have a few BCM Crane extractor kit upgrades I was meaning to install. Now, having them laid out disassembled in front of me I noticed some slight differences, particularly between my Colt M16 and LMT FA bolt:

The Colt (bottom) seems to have a raised surface extending behind the bolt lugs with an additional cut just aft of each lug on that surface. Does anyone the purpose of these? My guess would be to make unlocking smoother by providing "relief" cuts to ease the lug disengagement process. Any ideas?

Posted: 12/15/2007 6:57:30 PM EDT

[#1]

Don't know squat about anything other than Colt, but I can tell you this. Those diagonal lines adjacent to the lugs on Colt bolts have no functional purpose. They are simply the "over run" from the wheel that cut the diagonal at the edge of the lug.

Which is why they tend to vary in depth from lug to lug.

Notice that the LMT bolt is cutaway at the point where the lines show up on the Colt. I suspect that LMT may do this precisely to avoid those cut lines showing up. That's the only reason I can think of for their reducing the diameter at that point.

[ARCHIVED THREAD] - Colt vs. LMT bolt difference?

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[ARCHIVED THREAD] - Colt vs. LMT bolt difference?

[ARCHIVED THREAD] - Colt vs. LMT bolt difference?