Same NUB MOD® different color. Level I only.
Below are all the details, or just read the product reviews and take it from other shooters: if you run an ALS holster, you need the Nub Mod.
Level III users must buy the SLS Nub!
1911 (and other guns with large thumb safety's/decockers -Sig, M&P with safety-) users will find the safety in the way. You must buy the 1911 Nub! Does not work with HK USP's with the safety in the 'SAFE' position. This adds 1/8" toward the weapon from the factory lever.
Made in the U.S.A., this aluminum product is blasted and finished with mil-spec anodizing.
Faster: The reversed angle matches up with the pad of your thumb sooner than the factory button. You will find the gun in your hand just by grabbing it. Weak hand drawing becomes faster as well.
More Reliable: The wider release button means you have even less potential to miss the activation, especially on thigh rigs or mounting systems that push the holster away from your body. If you have ever found yourself pulling up on the gun before hitting the release you've noticed that gun is difficult to almost impossible to get out. The additional leverage of the Nub Mod fixes this stress induced or poor training problem if it ever arises due to the increased surface area for the thumb to engage.
Simple Install: Simply press the larger nub piece over the factory button from the inside of the holster. Align the smaller narrow piece with the top of the larger one. Insert screw and tighten with supplied hex wrench.