Thanks All. What prompted the question was a gun I have from a barter with a good friend:

Skimin & Wood BLNE
12ga
30 f/f steel
Raised rib
8 lbs 3 oz
Hidden third fastener
Clipped fences
Nitro proof to 1 1/4 oz
2 3/4
LOP 14 1/4
DAC 1 1/2
DAH 2 1/8
POW grip

I wondered about this because of its weight, and how much heftier it is than the other boxlocks in the house right now. Its neat. I like it and am blessed. Sounds like a pigeon gun to me.