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The PWS SRX (SCAR Rail Extension) is a quad-railed aftermarket extension rail for the FN SCAR series rifles. The SRX adds 5 to the length of your Picatinny rails. The top rail is 2.7 long and allows the use of flashlights and other accessories to be mounted at the 12 o'clock position without interfering with your sights or optics. Finally, the SRX features 2 QD sling swivel points positioned on the sides of the rail.