They had a short barrel, short forend hardwood stock, and a large knurled thumb nut to disassemble. The barrel did not detach from the receiver. Similar case to the 70P. Don't know when they were discontinued. Basically an abreviated 25MN.
Looked into it, they were called the marlin mini magnum and were sold during the late 80's for a couple years. Sales weren't anywhere close to the Papoose so it was discontinued. For the marlin takedowns, between the 39 tds, mini magnum, and the Papoose, the Papoose reigned king because of it's low weight at 3.25lbs, it's versatility & accuracy, and it's low cost. I'd sure like to find a 39 TDS... I almost cried when one sold in the EE a few days ago for $350. I missed it by an hour. They have sold for over $600 used.
The issue is it,s a survival rifle, not a daily plinker. Buy a 10/22 if you want to shot weekly with it. I,m thinking that the ar7 is a survival tool. It,s something that would do in a pinch, if the situation called for it.
Sounds to me like you are convincing yourself... Believe me, I wanted one BAD! I thought they were the neatest thing since the leatherman. I didn't listen to any of the naysayers either... I had to have one, and planned on stashing it away for "survival" situations.
Who are we kidding? How often do you find yourself in a survival situation? If you were in one would you rather have a gun that you can bet your life on or a pos that works ok sometimes? The fact is the concept is good in theory, but practically, nobody wants a gun that they don't want to use for fear of wearing it out, or they don't want to use because it's not very accurate and jams a lot.
The infatuation wears off real real fast. The reason i prefer the Papoose is exactly the opposite of what you posit... I use it almost every week, because it is very easily disguiseable in it's little case, I take it everywhere. Nobody suspects what's in the case. It's super reliable and useful as an accurate daily plinker. BUT... If I were to need a tiny .22 to throw in a BOB or to take on a hike or fishing/camping trip, it only weighs 3.25 pounds and packs up under 21". You get the best of both worlds. Believe me, the small sacrifice of the extra 3/4 lb and 5" length pays off 10 fold in what it makes up for the AR-7's shortcomings.
I think if you want one you should buy one and decide for yourself. You can always sell it in the EE.