Exilis Linerlock Stonewash

I have 6 Guardian Tactical knives. Love them all. I bought this Exilis several months ago on line and had to return it, it was very hard to open, would not stay locked after forcing open. Decided to try it again through Amazon, this one opens easy, but wont lock while opening all the time. Still closes without pressing thumb release sometimes, but I still love this knife, gonna keep it, just have to flick it out with some force.