Help Please

[Darryl Alexander]

I recently purchased a Parker on-line. It was listed as a 10 gauge, lifter, Grade 2, with a straight stock, Serial No. 5071. I recieved the gun today from the little brown truck. Gun looks great, straight stock, numbers match, definitley a lifter, I cannot tell if it is a grade 2 yet, But it is not a 10 gauge. None of my 10 gauge brass, old or new, will fit. I will not have access to a bore gauge until Sunday. Is there a possiblity old number 5071 is in the book?
Thanks in advance for your help.
Darryl Alexander

[Bindlestiff]

yep
12ga grade 1 with 30 inch twist barrels

[Darryl Alexander]

Thanks for your help.
Darryl Alexander