Things I liked:Solid quality in materials & construction. The fiber optic insert is great & helps to sight in quicker. Solid detente in the clicks. It works!
Things I would have changed:A lower profile but it most likely wasn't designed to mount on the Crosman 1377. Which is what I did.
What others should know:The sight is rather high and you may have to install a higher sight (or shims) on your sight at the end of the barrel. I have a Crosman 1377C with a 14" barrel with a muzzle brake on it. Also my receiver has a dovetail mount. I replaced my fiber optic ramp sight with a new ramp on the muzzle brake with a dovetail slot and into that I put the highest fiber optic sight I could find. I got that at midway. It cost about 25 bucks not including shipping. Marble's Front Sight .450" Height .340" Width Steel Blue 3/32" Fiber optic orange. Marble's Front Sight Ramp .225" Height .375" Dovetail Slot for .687" Barrel Steel Blue With the height of the muzzle brake and those two items, I was able to sight in at about 30 feet and five pumps on the gun. I also drilled a new mounting hole in the new ramp because the OEM mounting hole is in the dovetail slot. I want the sight at the end of the muzzle brake. If you do this, a Drill press is recommended. It all worked out very good. All that makes this sight more costly but I didn't know it would be so high and I like it so much, I am willing to make modifications.
Things I liked:Solid. Good clean clicks. The fiber dots pick up light well.
Things I would have changed:Nothing
What others should know:Too tall for crosman pistols with steel breech.