Tetra is Good Stuff! I use the grease, oil and spray and find them to really work as advertised.
The spray even makes short work of cleaning black powder guns. I recently used it to clean a BP revolver that had been neglected by a previous owner and it really shined after I was done.
Using the grease on the rails of a semiauto really smoothes out the action, and a bit of grease on the sear will improve the trigger as well.
My only gripe is that none of the shops around here carry it, but I can find it at most gun shows. You can order it from Fulton Armory, too.
Ken Strayhorn
Hillsborough NC