The Precision Picatinny Quad Rail Handguard System follows Arsenal's legacy of quality and craftsmanship. It provides a superior platform for a wide range of attachments, including optics, flash lights, lasers, forward grips, and other accessory options. This Precision Picatinny Quad Rail was designed and manufactured to meet and exceed the following stringent military requirements. The stainless steel internal guide rail accepts a cleaning rod with the rail system installed. The rail system easily aligns with both milled and stamped receivers using a pair of precision machined tabs. The rail system has sealing caps to constrain debris from entering into the receiver from under-rail openings. The triangular support design and aircraft grade durable aluminum minimize weight while providing maximum strength. It has an optimum design allowing 14 rails on the bottom and the sides and nine (9) rails on the top. The clearly marked numbering system on all four sides aids in repeat attachment of devices. The compact system profile and smooth finish provide comfortable grip to the shooter. The PR-01 quad rail system fits the SAM7, SLR-107F/FR, SLR-106F/FR Series / D.