The complete rifle.
The locking mechanism of a Colt Burgess can be seen here. It is a a three pin linkage using the lever pin, an intermediate pin, and the pin holding the linkage to the bolt.
To assemble the parts slide the bolt into the action from the back. Insert the other parts into the lower part of the action and insert the lever pin through holes E and F.
Line up the hole C in the linkage with hole B in the bolt. Insert the linkage pin through hole A in the side of the frame joining B to C.
There is then a plug screw that goes in hole A to keep the linkage pin from coming out.
The locking of the action is then accomplished by the pin at "BC", the pin at "D" and the pin at "EF".
An interesting feature is the cartridge ejector. The cartridge extractor is at top of the bolt like most rifles. The ejector is a small collar that surrounds the firing pin where it contacts the cartridge. This collar is a little under a quarter inch in diameter and about a quarter inch long. It can slide out of the front of the bolt about 1/8 inch. A flat "V" spring at point "G" in the tab sticking down from the front of the bolt forces this collar out. As the bolt starts traveling backwards the extractor pulls the case out of the chamber while the collar around the firing pin pushes on the back of the case. As soon as the case (or loaded round) clears the front of the ejector port the collar (ejector) pops the case out of the top of the action.
MORE ON THE COLT BURGESS
A problem with the original Colt Burgess was the thin wood in the forearm in the area of the loading gate. The wood is so thin in this area that many original Colt Burgess rifles have the forearm broken in this area. Ours was broken like this when we got it. The loading gate slides forward into the forearm rather than folding into the action like a Winchester.
While I don't know for sure if this is a big problem the design of the firing pin looks like it could give problems. At any rate the two Colt Burgess rifles I have had the opportunity to examine both had broken or replaced firing pins.
Here's a drawing of the firing pin.
The firing pin has a "hump" in it to clear the toggle linkage as the action is cycled. I suspect that as long as everything is clean and not gummed up it would work fine. But if things would bind up due to black powder fowling or general dirt the firing pin could bind where in passes through the front of the bolt and cause the firing pin to bend when the rifle is fired.
This is one of the parts my dad and I are building from scratch.