The Hawken flintlock rifle the historical society received measures 58 inches; its .50-caliber barrel has straight rifling — most rifles have grooves inside the barrel to guide the projectile.

The Hawken flintlock rifle the historical society received measures 58 inches; its .50-caliber barrel has straight rifling — most rifles have grooves inside the barrel to guide the projectile.

Morphy Auctions, the Denver-based auction house, will host a historic 161-lot selection of early arms and military memorabilia on May 18. The auction includes American flintlock rifles and pistols ...