Alecrin,
..Dave is damn right!....
..Internal barrel of 13mm loaded with 25bars takes kgs 33.16 to push back the piston with the shaft.....if you load a gun with the internal barrel of 11mm with 35,26 bars you'll have same loading effort and same power.... BUT without mamba kit the gun with a 11mm internal barrel has a huge advantage: the column of water inside the barrel around the shaft is much smaller, that is more power and speed....
The only advantage I see with the 13mm barrel is a lot of pump strokes saved (if you load it on your own)...
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