Well according to the site you need an insert from them for it to work. The rest, cha ching, the inserts,cha ching. The insert is not a normal one of about 10-15 grns., it's 50. Which means for a guy who shoots 100grn heads he'll need some 50 grn ones. Mighty flimsy head at 50. I'll let someone else fill a drawer first with one before I do.

Great idea though. Just needs something. IMO