You can return the product without providing a reason within 14 days.
Straightness: +/- 0.003;
Weight tolerance: +/- 2.0.
The rails are factory-fitted with an "adapter" unibushing under the G-Nock cap (need to buy separately).
You can also remove the unibushing and use the SuperNock or SuperNock 3D (pushed directly into the radius).