MSRP $ 1,899.00. Compare. Ruger’s No 1 rifle features a strong, simple, compact falling-block breech mechanism with artillery-style breechblock and under-lever. The sliding tang safety provides instant security, and the receiver forms a rigid support for the barrel, stock and breech block. The Ruger scope mounting system with quarter-rib .... The classic Ruger No. 1 single-shot series has expanded with two rifles in .308 Win and .450 Marlin, as well as two Lipsey’s Distributor Exclusive models chambered in .30-30 Winchester and .257 Roberts. The No. 1 is already available in .450 Bushmaster, .30-06 Springfield, .243 Winchester, .44 Remington Magnum, .35 Whelen, .204 Ruger and 6.5.