1721 N. Bailey Muzzle mouldings (of a Gun) is the Ornament round the Muzzle.
1861 H. L. Scott 439 The swell of the muzzle..is terminated by the muzzle mouldings, which in field and siege guns consist of the lip and fillet.
1976 H. L. Blackmore I. 169 Immediately behind the muzzle moulding is a V-shaped fore-sight.