As for the Model 60 shooting hypervelocity rounds, the manual says "no," and based on the gun's failure to stay together while shooting approved ammunition, I am surprised other people have had good luck. Supposedly the MCarbo kit makes it Stinger-proof, but in order to find out, I will have to be able to shoot the gun a few times without having any parts fall off.
I wish the dust cover hadn't flown off the A22.
So you condemn one model for parts falling off while firing, but extol the superiority of another model, and state in the next breath parts fell off of it...?
What fell off of your 60?
I also believe, based on your statements, you really don’t understand what is a rifle receiver. The side plates do not go into the receiver. The Marlin receiver is in fact larger than the 10/22 receiver. Only smaller than the magnum length A22 receiver - it’s smaller than the 10/22 magnum too... because it’s not a magnum receiver.
Unlike the leveractions, not much changed about the 60’s during the Remlin take over. They have always been what they are - low production cost models. My son’s Marlin 60, now 3yrs old post-proof date shoots about a brick per month without a hiccup. It had better wood quality (finish) than my last Marlin built 60, and side by side, the guts are indistinguishable.
If you got a legitimately bad Marlin, then received a legitimately bad replacement, why did you not send it back again?
I typically can’t offer much help when guys say their Marlins won’t run on various ammo. When my shop was open, I’d have them bring the rifle in, worst case I’d have to clean it, maybe clean up the ramp, and lube it. Getting them to run just isn’t so difficult. Wanna rum hyper-velocity, low bullet weight ammo? Buy another spring, order a replacement buffer, clip a few coils, and run. The buffer is only to replace the factory one when it breaks, because 1) inevitably consumable products break, and 2) you WILL forget/neglect to swap the springs back before running standard energy ammo, and will increase wear on the buffer. Wanna run mags? Leave the stock spring alone, order another buffer, and replace it when it breaks.