I bought a primary arms multi reticle red dot with mount from someone on the ee about a month ago. The red dot is great but I have noticed that after I shoot about 150 to 200 rounds the cant mount starts to loosen. The other day I was shooting some targets I set up on a hill and somewhere after about 200 rounds I noticed that my shots were hitting a few feet left of the target on the hill. So I reached up to check the scope and it felt so loose that it almost could have fallen off. Has anyone else had a problem with their primary arms mounts coming loose like this?