Oh, what a tangled web ...
The following is pieced together from sources on the net.
"N.R. Davis & Sons were manufacturers of percussion, and later, cartridge shotguns from 1853 to 1919. Davis shotguns were well made and tried to live up to the companies motto "As Good As The Best".
Crescent began business in 1888 and made single and double barrel shotguns in Norwich, CT until 1893. Crescent then merged with N. R. Davis and Sons but soon the new company was absorbed by another company, H. D. Folsum. Folsum made shotguns under the brand name American Gun Company of NY, but also made guns for other brand names. In about 1930, the J. Stevens Gun Company acquired the Crescent business and soon merged it with another called the Davis Warner Arms Corp, successor to N. R. Davis & Sons. The resulting company was called Crescent-Davis. Stevens continued to sell guns marked with some variation of the Crescent name until 1941."
You probably just need a new spring for your fore end, but it is possible that something is worn out. Without disassembly and examination it is impossible to tell.
Sharptail