I have heard that some bags were extended by riggers for use with carbines with the cone flash hiders on them.
Anyway, I think you did very well. Doesn't the little carbine feel better to hold than a modern made almost copy of an 1895 Marlin 45-70? After all, original Marlin 1895s had a square, flush bolt like the 1888s, 1889s, and 1894s... The modern one is at best a replica! With the Carbine, it was a real warrior's weapon. If it could tell a story.... Omaha Beach, Bastogne, Remagen, Hertigen Forrest, Iwo Jima, Okinawa, Kwajalein, Chosin Reservoir, Pork Chop Hill, Inchon, Mekong Delta, Central Highlands, Hue... The possibilities are endless.
The Type III bayonet lug band is certainly an upgrade, as a 5.5 Winchester would have had a Type 1B band, or maybe a type II. The round bolt and Type V slide are upgrades from Inland, and I think 5.5 is too soon for an adjustable, though my 5.7 Winchester has an original Type III adjustable sight.