I have the DNZ Game reaper aluminum one piece base and upper rings on my 30-06. Although you use steel screws, even if you hand torqued it , you wouldn't strip the base, due to the length of thread engagement in the base. They are engineered this way.
As for the base attaching to the receiver, the elongation of the threads when torqued apply pressure against the screw head base, this is what keep them tight, same applies to the rings.
Its super rigid, particularly when the scope tube is set, there is no bore measurements, nor honing for alignment purposes. The less mechanical connections, the more rigid the mount. Best of all, the base and rings only cost 56.00, saving me money compared to a leopold base and ring set. Not to mention the weight savings on my mountain rifle.
By the way, the DNZ replaced a weaver mount that came on the rifle.
Mine set on the receiver very tight and uniform, a true piece of engineering and machining...
Mossberg ATR 100
you won't be disappointed.