I have to agree with Carlos.....the idea is a good one and perhaps should be patented.
Not only because of the rifle attachment, but because of the size.
Since todays military actions have been in arid regions, were foliage is not much of an issue, many are choosing smaller knives to help them along their way. Not to mention the U.S. Navy Seals, and others who have special needs.
I think the Phrobis C.U.K. is the perfect size for those who appreciate the
fixed blade knife under the above conditions, and many others.
I make a Custom Military Combat knife with the M9 bayonet as my original inspiration.
The ability to attach it to your rifle, along with the ability to change the whole deal around if needed is excellent.
Great Idea Mr. Moon.