Buck 112 Ranger. Did I get a lemon?

If I press hard enough on the tip end of the closed 112 I’ve carried in its sheath almost everyday for several years, the back side of the spring will rise up. But I haven’t noticed a problem.

If I carried this in a back pocket of my jeans and sat on it just right, that might do what I just did above. But otherwise I’m not sure how this would happen for me.

I don’t snap any of my lock blades closed.
 
My guess would be it's being pocket carried with other things in the same pocket that can depress the blade.
Either way, as already established, this is a common issue on most trad style kickbacks.
Also, as already pointed out, most of the time these knives are made to be carried in a sheath and when used in that manner they don't have a problem.
To mod a knife with this issue you can put in a stop pin (like another member mentioned) although this may be something you're not comfortable attempting.
There are also stacks of other knives out there with better locking systems which are more friendly to pocket carrying. Most frame locks perform better in this arena.
Buck also make several liner lock knives which might suit your purpose better for pocket carry.
Either way I agree this is a design flaw. A knife shouldn't be able to impact on its own frame under any circumstances, and given that there is a reasonably simple solution to this (stop pin) which can be retrofitted with minimal issue I'm surprised Buck hasn't incorporated this into the production models.
That's my two cents (or maybe three, this is a much longer post than I expected to make), do with it as you will.
 
I had a 112 Ranger for many years and noticed that edge contact issue myself.Part of that issue is how crisp the snap is on those models.Putting aside one flaw for a second and mentioning another is I've noticed their blade craftsmanship varies a good bit.You could probably take 10 Rangers out of their boxes and notice a lot of variance such as blanking precision,the swedging,and the Edge 2X geometry.

I don't know if it's Buck's high volume production methods or if they just aren't as kind to their 420HC Stainless Steel.I guess if they can blank it quickly and put an edge on it that's good enough for them.
 
Part of it is the snap, the other part is that due to the construction if enough pressure is exerted on the blade going back into the handle, it will depress the spring and allow the blade to contact it. If the rest it came against was fixed, like a stop pin the issue wouldn't be there.
 
I've only owned one 110, but I can't say it was an issue on that knife. On the various 501's I've owned though, if they closed a little hard, the edge of the blade near the tip would impact, causing it to dull.

It would seem the easiest way to prevent this from happening would be to leave the kick just a little longer, to keep the edge further from the spring and lockbar.
 
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