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That sounds right. Luckily it's not a part that fell out on me, it was just in a bag of small parts I got a while ago.This most likely came out of a scandium gun or an X frame.
My 327 8 shot has this, it goes under the hammer/trigger in a vertical slot, the hand will have an extra long pivot pin
that protrudes out of the left side of the trigger and rides in the slot of this little piece.
As you pull the trigger the stub of the hammer pivot pin pushes this part up and locks the bolt closed during the firing sequence.
I'll check back tomorrow if you need more info or maybe somebody can add pic's, ain't time to clean my 327 so no pic's
from me unless you really get stuck.
Ps. unless your shooting magnum loads you can go with out it for awhile imo, but you get what you pay for with my opinions.