I have a 1931 Vintage A5 16ga marked 2 9/16 with the safety in front. It is a more convenient safety I believe than the back one.It is Serial # 116875 and it ejects
my Federal 1 oz Game load just fine. The other A5 is X93955 "Sweet Sixteen"and is marked 2 3/4 and weighs 7 lbs. The older one is 7 1/2 lbs which is the only difference that I can find other than the safetys.