I have found you won't have broken strings with adequate lubeI have the cobra and it cocks rather easily if you put one hand all the way to the front, other hand on the back handle, and bend it over your knee.
I also have 2 other similar crossbows from a different manufacture.
With all three I had a problem with the string winding not lasting beyond a few shots.
So I rewound mine with some larger nylon braided cord. Then super glued it for durability (and once I'd tested that it would work)
I'd be interested in magazine for all 3.
They are 80lbs in a very small package and could be quite effective in the right situation.