The A3 Industries Modular Telescoping Brace (MTB) is a great alternative to folders, and features a minimalist design keeping it ultra compact and light. When fully collapsed the assembly only adds 2.00" to the overall length of your firearm. With a Picatinny 1913 mounting interface, you can mount a telescoping brace to virtually any firearm with a rear Picatinny rail. FeaturesOnly adds 2.00" to the overall length of the firearm when collapsedEasy push-button release, with 4 length settings spaced in 1" increments.Can be mounted with the button facing up or down providing 1" of vertical offsetSpace between the rods is 1-15/16" making it compatible on MOST firearms