Accuracy fixed.

[NugginFutz]

I bought the brownell tool, also brownell lapping compound and used my drill at a low speed to lap. May have screwed up as I lapped with the receiver horizontal not vertical as i did not want any lapping compound to run down the tool and lap the inside of the receiver but what do I know. The Odin works 20 incher shot well

While what LRPF52 said about vertical orientation of the upper while lapping has its merits, my lapping tool has a very good fit in all the uppers I've lapped. For that reason, I would have no qualms about mounting any future uppers in the traditional horizontal position. I get measurably straight surfaces and less chance of lapping compound invading the upper's interior. In the case of my tool, it has a definite recessed section which prevents the pilot section from coming anywhere near the receiver face and the lapping compound.