Has anyone here tried the screwfix foam gun, you can see it here
http://tinyurl.com/o70i

I've gone through three cans of foam and two guns, one of which was
supplied free by screwfix but I can not get any flow from the damn
thing. I just wondered before I get back to screwfix if anyone else
was having the same problem?

Also I noticed that the gun in the picture on the website is an all
metal affair whereas the supplied gun and the one in the catalogue is
mostly plastic. Has anyone received the metal type?