I have had zero issues using them on an 8lb 416 Rem and a 6.5lb 375H&H. I figure there are less things to become loose with the one piece design.

I especially like the extended front model as they allow me to keep the front ring off the front lens of the straight tube scopes as doing so has caused me to crack lenses on a couple Leupolds in the past.

Last edited by AK416; 07/23/15.
Experience is what you get when you don't get what you want.