I have a very old lc smith 12 guage, both barrels full choke, 36" barrels. No hammers, flip lever to open. Would like to know more about it

You should start at the Home Page
https://lcsca.clubexpress.com/
Look under 'Shotguns' and the FAQs

Are you sure about the barrel length? NO hammerless No. 00, No. 0, nor Field grades were shipped with 36" barrels.

Please post the SN found on the action flats and barrel flats. Use XX for the last 2 digits if you desire.

Images of the side of the action, the barrel flats and action flats would help ID the grade.

I have a similar gun. Mine was made in 1917. The gun's grade is stamped on the barrel near the receiver. Most guns were field-grade and not engraved. Mine is an "Ideal" grade which is the first lever over a field grade. It has some engraving. There are two or so higher grades but I can remember what they are.

Warning. Mine is in the shop right now because it fired accidentally when closing it after loading on a skeet range. It could easily have killed someone. It has a recurring malfunction in the trigger mechanism. My gunsmith told me these guns were poorly engineered - particularly in the way the almost paper-thin interiors of the stock sustain substantial force from recoil. I went to the shop and saw it myself. Really bad. Also, the relative spacing between the two hammer plates and the trigger mechanism is supported by the wood and is therefore subject to change as the wood compresses over time.
These guns are a wonderful part of history but I wouldn't want to take one hunting.

MT