The invention is summarized as mobile storage system for weapons and weapon accessories. The first stage comprises signal detection and employs a correlation between the sampled incoming waveform and a pseudo-noise code sequence. The minimized surface may be on the end of the spool or one or both of the end caps. Device functions are then performed using the trim values stored within RAM. When the inserting direction of the slider is reversed, the biasing direction of the blade is also reversed. The intermediate guide element has a main block with a desirable number of through-openings traversing the main block, preferably arranged parallel to one another.