Kikko, that is a pretty good price on the BG as the CS site lists them just under 50 bucks now. They've gone up quite a bit. I bought mine a little over a year ago at 29 dollars US.Welcome to the forum. The answer to your question is Yes. The extension is compatible withe the two piece model and the standard 4 foot and 5 foot models. It is NOT compatible with the heavier Pro Model blowguns.