The Light Control System (LCS) is very versatile. As such, there are a lot of possible configurations. The LCS for the Streamlight does not support M-LOK or KeyMod interfaces. The LCSmk2k is designed exclusively for the Streamlight ProTac series weaponlights Dual-Function tape switch that is commonly provided with the Streamlight ProTac series weaponlights. The LCSmk2k is TOO LONG for the shorter Streamlight 69132 switch provided with the TLR-series. Unique Patent-Pending design utilizes a slot that ensures a snug, perfect friction-fit for the tape switch. Once installed its not coming out unless you want it to. Custom-manufactured size 8-32 Torx-drive screw. Made from hardened steel and then black nitride plated for superior corrosion resistance.