The simple, square locking lug, short top lug, and forearm lug, tell me that they are most likely from a Cresent Fire Arms shotgun. Cresent produced shotguns under over 100 different names. They were one of the few to build economical 410's. N.R Davis guns have different style lugs.
Its a shame that you dont have the rest of the gun, they are fun to shoot.
Brad
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