Buy once-cry once
Response from mallardarmory.com
We are sorry this customer had a stressful experience. We are also disappointed we did not have an opportunity to discuss the engineering of this item and verifying correct use with the customer. We respond to all questions and concerns via email at firstname.lastname@example.org
Mallard Armory stands behind our products. Our customers have a lot of success with the upper vise block. It is designed to put pressure on the correct sections of the upper receiver, without damaging the receiver including the dust cover. For the safety of the end user and the firearm, we do not recommend altering this item.