Lyman receiver sight - Lyman 66 Receiver "Peep" Sights

This sight installed in less than five minutes, and fits perfectly on my Marlin 39A. Target knobs would be nice, and incremental "clicks" are vague. The worst part is that the elevation slide fits loosely in the machined slot, allowing the sight to be too easily moved accidentally.
Pros: Easy installation. Ability to zero the chosen setting
Cons: Indistinct "clicks" in adjustment. Loose fit between parts

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