i already have a std HW 45 in .22 & a HW45 black star in .177 i thought it would be great to have all 3 calibre's, i'm not into messing around changing barrel's, if it could go wrong it would with me so after a lot thought i've ordered and paid a deposit on a new (.20) HW45 silver star, they are not readily available, they are on SPECIAL order, so it's a bit of a waiting game.