Your English is fine...
see if your friend of a friend is willing to let you do some test firing. Are the 2 batteries also a year old? IDK about everyone else on here but the price sounds a little steep without really knowing what external modifications he made. The picture only tells so much. Compared to the Kraken, haven't used so I can't offer opinion there.
"Hey I'm the first one to say its a great country but its a straaaaange culture. This is a place where gun store owners are given a list of stolen credit cards but not a list of CRIMINALS and MANIACS. And now they're thinking of banning toy guns...AND THEY'RE GONNA KEEP THE F**KING REAL ONES!"
-George Carlin 1937 - 2008 (RIP buddy)