5-Series class : Fast attack craft
Myanmar Navy launched a new gunboat in 1996. 5-Series class length 45 meters and displacement 220-260 tons, Install 2xfuruno navigation radar, 1x2M-3 25mm twin gun ,2xZPU-1 14.5 mm guns, and 2xCRN 91 30mm single guns (or Medak gun) from india. 7 boats in service between 1996-2008 (UMS-551 to UMS-555 ,and UMS-559 t0 UMS-560 after 2004). as many as 25 Burmese naval ships may have been sunk in the storm caused by Cyclone Nargis in May 2008, maybe included some 5-Series class.
In 2004 The first missile boat was in service. she install 1xMR-331 Square Tie Radar, 1xType 347G Fire control radar, 1xFuruno navigation radar, 1xType 362 surveillance radar ,2xKolonka optronic director ,2xAK 230 30 mm CIWS Gun ,2x14.5 mm quad machine guns unknown type, and 4xC-802 Surface-to-Surface Missiles. have 3 boats in this subclass UMS-556 to UMS-558.
The last 2 missile boats launched after 2008(UMS-561 and UMS-562), little modify the hull and superstructure, install 1xMR-104 Rys (Drum Tilt) radar ,1xUnknown sensor ,4xDecoy Launcher unknown type (chaff and flare) ,2x14.5 mm quad machine guns unknown type ,and 1xGibka Launcher for 4 SA-N-5 igla SAM (have ESM atop the foremast)
In 2013 Myanmar Navy built many gunboats again. install 1xType 362 surveillance radar ,1xFuruno navigation radar ,2xZPU-1 14.5 mm guns ,and 2x30-40mm single guns unknown type.
I think Myanmar Navy have 5 missile boats and 12-15 gunboats of 5-Series class (found a picture of UMS-569)