Quote:
Originally Posted by Jusselin
cane please explain 
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That part is a plastic flat MSH. It is pretty-much standard on production 1911s today. Don't believe me, stick it with a knife tip. It's a great way to take a
"MR. 1911 macho owner" down a notch or two! This is not wise to do to any owner of a high-end 1911.
I loath tupperware (plastic)! It was the only reason I needed to replace it with a SS
main
spring
housing and the mag-guide was a plus!
This is a S&A SS arched MSH w/mag-guide.