This real-deal Picatinny rail replaces the plastic side rail found on the PS90 and P90 TR. It has 5 mil-spec slots to the original non-spec 1, allowing you to mount a much wider array of accessories. Operators using wide-based optics such as the Eotech have found that accessories won't fit on the factory side rails for lack of clearance. Our rails extend further than the original to overcome this problem. They also feature an offset mount to allow for additional clearance, up or down, as needed. Rails are totally ambidextrous and attach to either side of the receiver using existing threaded holes. This is our second generation model with low drag corners and extra matte finish. Sold per each. Express shipping is $5 on this item. Order of $35 and up ship for free. Need an Eotech? See our optics section.