The top of the bayonet lug latch that remains .....I left with sharp corners to act as a skull crusher/glass breaker and to use as a drag rake across my targets exposed hide.
The kewl part about using such is as 300 win mag states ....if ya lose it yer out a few duckets in peace time. Long enough to get from the joint of the neck /sholder to reach a vital yet the agressive grip pattern keeps the slick oil like dampness leaking from some critters a moot point .
Escrima ?