All TANDEMKROSS branded products come with a lifetime guarantee! Don"t load less ammo, load more with the TANDEMKROSS Plus1 bumper! This finely made bumper is designed to enable your factory mags to load one extra round saving you time at the range and giving you that extra edge while trying to one up your buddies. All the while your mags will seat better and give you that extra material to "bump" them into a locked state. Simple installation, only takes minutes to do. Warning: Cannot ship to California or New York*Note: Tweaking or break in period may be required in older or non factory magazines.