3x magnifier came apart - Firefield 3x Tactical Magnifier for Weapon Sights

I bought this magnifier to go behind the Vortex SPARC on a .50 Beowulf. I had to move the sight forwards to fit the Magnifier behind it. When I went to check my zero, it was not repeatable after the first 4 shots. I shot another 5 shots trying to figure it out. When I took it off the gun, the Sightmark had a very noticeable rattle inside. So in summary, after less than 10 rounds of recoil comparable to a 3" 12 gauge, the thing came apart inside. Now I'm hoping I can get a refund rather than an exchange, I wouldn't trust another one not to do the same.
Pros: Didn't have time to find many before it died
Cons: Came apart internally after a few rounds.

This review was written in the old system and had content requirements that are different than reviews written today.