Bought my first one 39 years ago...a lot more since then. Only one has given me a problem. I sent it to them on a Thur afternoon, had it back on the rifle the following Tue evening. Of course, I haven't been everywhere and done everything and I'm not much of an authority on tacticool stuff so for all I know they're junk, but they've done well by me for a lot of years and a lot of purposes.
