I really like my HW45 - bought it as .177 second-hand, but was disappointed to find that someone had ruined one of the barrel screws by shearing the head off (having described it in his post as being in "excellent condition"!). I persuaded a friend who is a supervisor in an engineering works to get the stub of the screw removed for me and managed to source replacement screws. I then bought a .22 barrel and can now swap between the two. Result!