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Diana 56TH

Its a great gun, great trigger with little work. 

I've done a bit of work to mine, but it is a good gun. With FTT 8.65gr 4.52mm and the Barracuda FT 4.51mm pellets I'm capable of shooting 3/4-7/8" 10 shot groups at 55 yards off my knee. 

I'm not sure what your build is, but this is a large and heavy rifle. I'm 6'2 and have long arms/ legs, this rifle is at the absolute max size I can shoot comfortably. 

IF I decided to shoot this rifle as my main in WFTF Piston I would have to chop the stock by 1" in the LOP department. But then you'd need to address the lack of forward adjustment for the scope rail as well as the droop factor. 

You could use a CCA Accurized Zero recoil scope mount from Hector M, and put that atop a UTG dovetail- picatinny adapter to get that out farther that would help. I'm not a fan of the zero recoil mounts. I appreciate the concept and have never used one of Hector's but as far as repeatability I just try and keep moving parts to a minimum. 

The factory piston in a 48/52-54/56 is the heaviest I've dealt with so far. Over 320 grams. If you planned on open piston or hunter it would be great, but I'd recommend running a lower power than 19/20 just to save your scope.
 
Its a great gun, great trigger with little work. 

I've done a bit of work to mine, but it is a good gun. With FTT 8.65gr 4.52mm and the Barracuda FT 4.51mm pellets I'm capable of shooting 3/4-7/8" 10 shot groups at 55 yards off my knee. 

I'm not sure what your build is, but this is a large and heavy rifle. I'm 6'2 and have long arms/ legs, this rifle is at the absolute max size I can shoot comfortably. 

IF I decided to shoot this rifle as my main in WFTF Piston I would have to chop the stock by 1" in the LOP department. But then you'd need to address the lack of forward adjustment for the scope rail as well as the droop factor. 

You could use a CCA Accurized Zero recoil scope mount from Hector M, and put that atop a UTG dovetail- picatinny adapter to get that out farther that would help. I'm not a fan of the zero recoil mounts. I appreciate the concept and have never used one of Hector's but as far as repeatability I just try and keep moving parts to a minimum. 

The factory piston in a 48/52-54/56 is the heaviest I've dealt with so far. Over 320 grams. If you planned on open piston or hunter it would be great, but I'd recommend running a lower power than 19/20 just to save your scope.

Good info here. Thanks Cameron. 
 
Before dismissing the platform you should look at anything written by Hector Medina. I am unaware of any other spring gun truly capable of 20 fpe and maintaining accuracy. Mine has been heavily tuned and is the most accurate spring gun I have especially considering the power. Another benefit is the ability to mount a bipod, no other underlever or break barrel can take a bipod without some clunky or weak workaround. I had a stock 56 and loved it. You will NEED to go to the ZR mount though as they are at the top of the scope killer list.