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22 caliber bolt action and semi-autos were not serial numbered prior to 1969 (when the 1968 Gun Control Act was implemented). Firearm serial numbers were date coded by a prefix within the s/n, as signified below. For example a Marlin model 39A with a serial number of N12478 would have been made in 1955. Marlin 99 Notes: The Model 99 (and its variants) was built in very large numbers for a rimfire rifle. The Model 99 used a short, flat-sided receiver with a curved back, and a stock with a shallow pistol grip wrist. The trigger unit included the safety, which was a crossbolt design located at the rear of the trigger guard. I had to work on saturday so I took a trip to the gun show today to find a near mint Marlin Model 99 M1.22 rifle. I saw it on a dealers table and I really thought it was some kind of special re-issue. Super clean with some tiny, tiny dings on the wood. $159 private sale:cool: I asked the.