TangoDown Vickers Tactical Carry Trigger, For Glk Gen 3/4, Black. WARNING: Modifying of the TangoDown Trigger in any way may render the firearm unsafe. Modification of any factory trigger assembly component may also render the firearm unsafe and/or void any applicable warranties. TangoDown strongly recommends that this product be installed only by a GLOCK certified gunsmith. TangoDown is not responsible for any violation of warranty or damages resulting from the use, modification or improper installation of this product. VTCT-001BLK