I know that there are those who are nervous about drilling their reciever and for them I have a few points:
1. There is no tapping necessary only the drilling of 3 or 4 holes.
2. We have an agreement with a smith who will mount these up for people who are afraid to take it on themselves or dont' have access to a good smith. Don't worry we have you covered.
3. The pistol grip screw is only one mounting point and it depends on wrapping the mount around the reciever. That is just too bulky, too much extra weight, and too unstable for what we have in mind.
4. The only pin that exists in the reciever is in a poor position, and would put pressure on the reciever walls compressing them together. It would also have to be removed to service the trigger group. So its a non starter.
5. This mount is designed to be combat ready, competition ready, hunting ready and generally people ready. I want the user to be able to drop their rifle while running, pick it up and hit their target. This isn't some made in my garage on my princess auto mill, learned on the internet how to machine part. The equipment that is used to make it is worth about twice what the average Canadian makes a year. The designers, development team and production staff are comprised of highly skilled persons who have careers invested in this sort of thing. I want users to have the optic fail before this mount.
Once mounted it is best to view it as just another part of your rifle.