I have a friend who received this gun from a friend. It's a Marlin Model 70 .22 semi auto. Built in 1983. "Micro-Grooved Barrel." That's about all I know about it.
Anyways, there is a trapezoidal shaped groove cut in the barrel. Any ideas what it's for? Our guess was it was for a sight of some sort but we're looking for the right answer. Any input is appreciated.
ps - It's a straight shooter and one of these older models can be purchased for about 80-90 bucks at a pawn shop. Great deal. Just FIY



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