Hi-Lux Optics currently offers three period-correct models that would be at home on a M1903A4 and the USMC M1903A1 sniper rifles.
Leatherwood/Hi-Lux Optics
M82g2 Scope Deep Discounts
Vintage Gun Scopes, 51% OFF
Lockhart Tactical Raven Modular Semi-Auto Rifles - Hi-Lux Optics William Malcolm M82G2 Vintage Reproduction Riflescope
Hi-Lux Scopes
Wm. Malcolm 8X USMC Sniper Scope
scope/site
Vintage Gun Scopes, 51% OFF
Hi-Lux Precision Rifle Scopes and Optics
Vintage Gun Scopes, 51% OFF
Vintage Reproduction Telescopic Scopes Tagged 8X - Hi-Lux Optics