I just bought a 2nd-hand Springfield Model 56: I'm wondering how people go about "testing" a rifle when they buy one 2nd-hand?? on top of the barrel are stamped ________________________________________________________ "Springfield Manufactured by J. Stevens Arms Company" Chicopee Falls Mass. USA Cal .22 S.L. or L.R. MODEL 56 __________________________________________________________ I'm familiar with my Remington 870 Shotgun but have had little to do with rifles. I've taken the bolt both in and out, put the magazine in & out, pulled the trigger once. my question is "How do I go about testing this rifle. just shoot a box of shells thru her? What does S.R. or L.R. signify? I want to reduce the rabbit population on my my 10 acres Suggestions - comments questions welcomed .