hello every body !!! i whould like to pick your brains i have an a h&r top brake pistol i bought for $ 20.00 it had a problem with hand that i knew i could fix easy enouff, i was tring to find a ser number or model number on it ,well the olny number i could find was 607 on the cylnder and one under the grip. could some body tell me is this number the ser or the model number