Works great... caution super fine threads! - Primary Arms SLx 5X Prism Scope Anti-reflection Device

As with many optic attachments, the threads on this are VERY fine. I have two of the Primanry Arms 5x scopes and the first went on fine, unfortuantly I messed up on the second due to the super fine threads and cross threaded both the optic and the ARD (fortunately Primary Arms has a lifetime guarantee and are in the process of repairing/replacing both the optic and the ARD)

Other than then that small issue (which is my fault) the ARD works great and has very little impact on the percieved brightness/clarity of the optic.

It would have gotten 5 stars if both ARDs had gone on without issue.