I of course have found some threads on take down guns here but have become fascinated with the design and machining of these interesting guns. Most of the older ones have no disconnector, so they slam fire. Many have features that you can see have evolved in some of the pump guns of today. The fun part is they are really pretty cheap.
My first was a Stevens 520/Westernfield 30 in 12 ga. $150
Then I added the Stevens 620 (from an auction covered in black barbeque paint for $100)
Then, this week a Marlin M44 in 20 ga, Built somewhere around 1933, and a Winchester 12 also 1933. Both are cetainly worn... both under $200.
You have all probably seen the Stevens take down attachment but I thought the Marlin and Winchester versions were pretty cool too:
Marlin 44- reverse threads.-takes a moment to screw it together.
Winchester 12- interupted threads, insert and turn 1/4 turn.