Here is an unusual M21 I engraved in the early '90s for the USRAC custom shop
. I'll post a couple more.
One set of barrels...one barrel is 20 Ga. the other 28 Ga.
Between '84 and '92 I engraved about a dozen firearms for the USRAC custom shop. Half were M21 shotguns, the others mostly M70 rifles.