I know folks who demo the 5.56's low recoil by resting the buttplate on their chin.
And, some troops are taught to put their nose in contact with the operating handle to maintain a consistent sight picture...
I shoot one like a pistol -- one-handed.
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And, wimpy miss Kuntzgurl's shoulder is bruised by 5.56 recoil?
Too bad someone didn't hand him a .44 magnum -- or one of the newer "hot .50s" -- and, video the hilarious results...!
Resting my nose on the charging handle is exactly how I fire the M16. Works great.