My father in-law gave me his Stevens model 77e 12 gauge shotgun, the barrel it is stamped "2 3/4 Inch chamber" and has a 5L on the left side and then a SP on the right side.
When I took the fore end off I found the words police and a serial number hand written. Could any one tell me any more about this gun ?

I also want to clean the gun a little more as it has not been used in a long time but not sure if I have the skill to strip it down any more with out some pointers.

Thanks for your time