Babar
the 48 and the 52 are the same. same action and stroke. the only difference is the 52 has a fancier stock. I do believe the 54 is also similar to the 48/52 , only difference being the sled action that the 54 has.
http://www.diana-airguns.de/index.php?i ... height=768
I have never shot the 48/52 but have shot a bit with the 54. great gun but heavy. the 48/52 should be a great shooter....not too sure of the weight.
my only problem with the magnum guns in 177 is that they tend to be a bit "too hot". with a good after market kit...JM , Vortek you should be shooting medium weight pellets at 900 + fps. OR a good home lube should have the rifle shooting around 900fps. a mv of 20 to 22 + ft lbs with a 177 is a little too much. in 177 as one gets close to the 1000fps accuracy tends to go down. just my thoughts.....
900fps and a medium weight pellet that gives a mv of close to 18 ft lbs is imo around the max operating limit in 177.
I prefer open sights too.
what ever its a great gun.....have fun and shoot safe........