As someone who is a good local historian and comes from one of the centers of the Finnian movement, I'll just let that pass. There very good reasons why not for such a person with Finnian ties. (Sean Finn movement, IRA is a later term)
Firearms being hard to come by in Erie, one would be more inclined to leave it with brothers in the movement and not risk being caught with a firearm by someone from the Royal Navy checking a ship. Yes it did happen.
Also firearms were easy to come by in the US so one would not need it and if it were a cartidge gun, ammo might be scarce.
As you may not know, the Finnians were never known to posses good firearms, when the invaded Canada from New York State, they were mostly armed woth smoothbore flintlocks and were mowed down by Canadians with Snyders.
General O'Neil went to north central Nebraska and founded a town named after him. They were going to invade Canada through the Dakota Territory. They had arms buyers in Lincoln, they were caught and the arms confiscated. Yep Surplus Civil War arms and not the good stuff. The cheapest junk the goverment had to sell.
One can see one of the arms on display at the NSHS museum. A rare Meechem conversion on a 63 Springfield. Experimental arm passed over in favor of the Allin Trapdoor conversion. The caliber of this rare arm is 58 rimfire for those who are interested. I believe maybe 500 were made under contract for testing by the Army. These were sold cheap in the 1870's.