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My Glenfield Model 25 has a micro-groove barrel,so I imagine others do as well.
It should be marked on the barrel if it has the Marlin micro groove rifling.The model 25m was made from 1989-2003.That being said it will if it was a early made rifle.
Yes the Marlin model 336 in 356Win.caliber has the Micro groove barrel.It should be noted that there were only 1,652 model 336 rifles in this caliber that were ever made.
The Marlin 890 22LR was made starting in 1954-60. This was Marlins Micro Groove experiment
Your Marlin model 783 was made in the year 1971.
I can say that the Marlin model 783 has not been made sense 1988.
You will need to add the serial number,to get the answer to your question.
Made in 1963
Your serial number indicates that your Marlin model 782 was made in the year 1977.
Your Marlin model 336CS(Carbine Sporter)was made in the year 1987.
Assuming you're asking in which year this firearm was produced, it was made in 1984.
Your serial number indicates that your model 782 rifle was made in the year 1981.