Richard at Guns, Holsters & Gear reports on the FN SCAR PDW …
The SCAR PDW is a select fire weapon, allowing for single shots or fully automatic fire. The cyclic rate is 650 rounds per minute.
The compact size of the PDW lends it self to troops normally confined to aircraft, trucks or other confined spaces who go into harms way. While a full size SCAR rifle has distinct advantages over a PDW, the PDW allows for ease of carry in restrictive spaces and rapid deployment.
I really like the design. It reminds me of the H&K HK416 Sub-Carbine / PDW.