You are getting the cart before the horse, Brian. The Stevens Model 311 didn't exist until 1948. The gun with the Tenite stock was introduced as the J. Stevens No. 530-M in the 1940 J. Stevens Arms Co. catalog --
No. 530-M, 1940 Retail Catalog No. 40.jpg
The Springfield No. 311 remained a G.S. Lewis patent action with the coil spring driven strikers.
The No. 530-M remained the offering through the 1946 J. Stevens Arms Co. catalog. During 1947 Savage Arms Corp. consolidated their arms making at the old J. Stevens factories at Chicopee Falls, and in the 1947 catalog the Tenite stocked gun was a Springfield No. 311 --
Springfield No. 311, 1947 full page.jpg
By the 1948 catalog the Tenite stocked hammerless double was marketed as a Stevens Model 311 --
Stevens Model 311, 1948.jpg
By the 1951 catalog the Tenite stock was gone and the Stevens Model 311 had the walnut finished hardwood stock. So, they had three similar doubles with slightly different levels of finish -- The Stevens Model 530 & 311 and the Fox Model B. That lasted through the 1953 catalog. By the 1954 catalog the Model 530 was gone, but did remain on the 1954 Retail Price List.