To get the best out of them, you really need to use the gunsmith adapter or whatever it is called. The little thing that needs the stock drilling out a bit and epoxying in. It is an easy enough job for a person familiar with tools but also might be something the more anxious person might want to employ a gunsmith to undertake. More so if you have a really nice stock I guess. I just got a forstner drill bit and went ahead. It was slightly too small but some careful dremel work and then standard epoxy and all was well and still is.
The other attachment thingy that I recall goes on the swivel or replaces the screw (cannot recall exactly) is ok but does not feel as secure or permanent. It was not something I could live with, hence the DIY install of the gunsmith adapter.
They are good bipods though. Some people really dislike them but for a rifle that you mostly shoot from sticks but want the odd shot from a bipod or for working up loads or zeroing etc, they are really good. I use the Spartan and also Harris. Happy using either from a shooting point of view. Less happy carrying a rifle about with a bipod attached though. The Harris tends to be used on rifles I use for more static shooting and the Spartan is more for shooting deer, even though the vast overwhelming majority of that is from quads sticks.
