When I received the adapter I was very impressed with how robust the construction appears to be. The machining is great and the coating is evenly applied and looks flawless. Removing the rivet on the Magpul stock is the most difficult aspect of the install. The one negative and the reason I can't give this five stars is the 1913 interface does not have any type of locating lug to prevent movement up or down on the rail - the adapter relies entirely on the clamping strength of the interface to prevent movement. Time will tell if I have any issues with the stock moving. I imagine any lug was left out to allow fitting to the back of the rifle for aesthetic purposes. The twin screws in the clamp should provide sufficient holding force, but it would have been nice if perhaps the screws themselves were used to locate the mount similar to the ACR to 1913 adapter from Dan Haga.