The Model 60 is the best selling 22 in history for a reason.....very accurate at a price you can't beat.
As for a detachable magazine feed unit....I believe the 7000 is discontinued. I'm sure you could find a used one or some NOS, but look into the 795.....same rifle just not a heavy barrel.
I've got a 795 and it is awesome. Extremely light, I can carry it all day in the gopher patch with no problem. Shoots all ammo well, and mine shoot Winchester Super X's like there's no tomorrow. Easy to clean and reliable....I would recommend this rifle to anyone.
P.S> Also nice to have an extra mag or two. Give you time to take a break from shooting for a bit, reload the mags, have a drink, let the gophers pop up again.
RancheroMan