I should look to sell some guns before buying more, but just can't seem to get myself to do so. . .
M1 Garand big and dainty? 
Is the Marlin Camp 9 the one that accepted pistol mags? I was looking at one many years ago, but didn't care for the handgun that it accepted the mags for, which IIRC was a Ruger P89 or something like that.
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read again....M1 Garand was too big for "dainty me"
I'm not a large person and I got small hands. Besides that, loading lots of 06 ammo to feed the beast was not fun.
I did sell it many years ago, but I sort of regret doing so.now. But I would not buy another one.
RE the camp9... It's ok and it does take pistol mags. But the gun has some plastic shock buffer inside that gets brittle and disintegrates.
When the plastic shatters it send bits into the action jamming the gun.
It won't feed hollow point ammo reliably.
It won't feed copper plated ammo reliably. Strictly FMJ round nose.
The chamber is loosey goosey so accuracy is on;y fair.
Marlin discontinued making it and they don't have the plastic replacement part either. (I bought an aftermarket replacement)
Having said all of that, If I had a range where I could shoot bottles and cans and stuff I would shoot it a lot more because it is fun.
But I would not buy another one.