I only own some of the 2nd generation with the Rolling Lock.Pioneer II's and Carnivore Cubs...used a cub for years.It's actually an interesting design being that it's not a vertical bolt movement.Literally it's a rolling/rotating bolt.The lock bolt is a semi-circle cut steel bolt that locks into a deep notch formed into the rear base.As you guide open the blade, the blade base pushes the bolt to roll against the spring resistance connected to the release lever(lock lever) and then shifts into the notch when it feels the clearance.It's a 45 degree rotation of the lock bolt.
I'm sure that REKAT's Rolling Lock can fail,there are posts on BF quite a few years ago about it ...but I've yet to see it.I'm sure it's from people expecting the Rolling Lock to be invincible.As a fan of REKAT myself I've never encountered weaknesses about it. I see failure more easily in dual omega spring designs than the Rolling Lock.For example,glass breaker function on a Benchmade knife with an Axis Lock-the transferred shock causes the bolt to 'jump' and fail in use...the Rolling Lock can't do that since it doesn't move actually.When I first handled an Axis Lock I thought it was 'consolidated' from it's feel.Because you're pulling down on the lock bolt and springs itself to unlock the blade.Revolutionary at the time for how well it work as an ambidextrous design.The Rolling Lock just a more mechanical feel and hearty,some may consider it obsolete to the newer designs of today while others may say 'oh yeah far more development was put into REKAT's work.After all aside from noting the mechanical function they made the lock bolt,blade rest bolt,and dual pivot screws from hardened 440C.