Trying to figure out who makes the gun and when its from . Think its from 1811 wince it has that stamped on barrel. On top of barrel its stamped PM above and then either IR or tR next to 1811. One the bottom of the stock and where the trigger was its stamped TC. Any help would be greatly appreciated thanks.
Can't tell much from the pics. A GUESS is that its a brown bess, but it could be anything. Too bad the lock is missing. Start comparing furniture, barrel length, caliber, rifled or smooth-bore, stock features, etc with what you can find on the web. Historical sites and the company Track of the Wolf may be a good place to start.
Looks familiar. This time I'll try to engage brain before mouth/email.
My Model 1816 Type I has a similar trigger guard. I have yet to measure them to see if the 1816 Type I could be modified to fit your Massachusetts milita musket, I do recall the finial is a diffeent length though similar shape. Width somewhat different also. Later M1816's had the sling swivel attached to the guard bow, not to that stud through the guard as on earlier muskets, including my Mass milita musket.
I still like your musket. Think if you could find a man skilled in Heliarc a.k.a. TIG a.k.a. Gas Tungsten Arc Welding he could build up some metal on an 1795 or Whitney triggerguard from The Rifle Shoppe. Then file it down to fit. If you do choose to have something built up by welding be sure the weldor understands that you want plain, mild carbon steel weld wire. He might think he'd be doing you a favor by welding the guard with stainless.