My great, great grandfather's Colt Lightning rifle in .38-40. Made in 1884, the first year of production, and it still shoots straight as an arrow with black powder rounds.
A close, close second is my grandfather's Winchester 1906. It's also a first year gun, but sometime in the 1910s it was converted from .22 short to s/l/lr.
A close, close second is my grandfather's Winchester 1906. It's also a first year gun, but sometime in the 1910s it was converted from .22 short to s/l/lr.