Go to www.savagearms.com and put in the serial# in the parts finder section that should give you the specs.(I think), as for "ns"= no sights.
Some where here on the forum there is a listing of all the letter denominations, try searching or FAQ section.
Try running a cleaning rod down the barrel, then measure how far it went making a revolution that will give you the twist,ie: 7"= 1:7,9"= 1:9 that is the best way to tell. Savage changes things all the time and make things in different configurations for different vendors.
You bought yourself an addiction because a savage can be whatever you desire with little effort and with some cash it can change over and over again.
By the way welcome to the forum you came to the right place for very little BS and tons of info.
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