By the shape of the hammers your gun is a Remington Arms Co. Hammer Double Barrel Shotgun, aka Model 1889. All the earlier Remington Hammer Doubles were made by E. Remington & Sons. The Model 1889 was made from 1889 to 1908 with a few more in the cleanup of break-action guns in early 1910. Serial numbers began at 30000 in 1889 to about 105000 in 1900 at which time they realised they were overlapping with Model 1894 Remington Hammerless Double Barrel Shotgun serial numbers which began at 100000 in 1894. So, they restarted Model 1889 serial numbers 200000, and started the new Model 1900 Remington Hammerless Double Barrel Shotguns at 300000. Model 1889 serial numbers reached 259262 in the 1910 clean-up. All this to say that very likely isn't a G in the serial number but more likely it is 77176 which would make it a 1897 vintage gun. While Remington Arms Co. never catalogued a single trigger for any of their doubles, they had a load of single trigger patents. Also, their were a lot of outfits offering after-market single triggers from the 1890s to WW-I -- E.D. Fulford; The Gun Improvement Co. (Bittiner & Jaeger); Moran & Wolfersperger; Philadelphia Single Trigger Co.; Lancaster Arms Co.; and others I haven't thought of.
We are going to need to see some better close-up pictures, and possibly pull the locks and look for Patent dates or number, etc.
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