PPDWParallel-Plate Dielectric Waveguide
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or a PPDW, which means it's meant for fun, target shooting.
Once I tricked out my sample into a PPDW with the SIG brace, Magpul iron sights and MOE-K2 grip, Trijicon RMR in a KZ mount, KAK pistol buffer tube, SLR Ritleworks handguard and charging handle, and Vortex flash hider, it still was just 25 inches long, looked awesome, still ran perfectly, and weighed 6 lbs 1 oz.