Since my review of the Sten MKII I've been working at a conversion to the MKIIS (Silenced STEN) and internal upgrades.
INTERNAL UPGRADES I kept the upgrades limited with the fps down. I intalled the following: Guarder M14 Cylinder - GE-03-07 Prometheus Hard Pistion Ver. VII Guarder Ver. 3 Steel Cylinder Head Guarder Ver 3 Spring Guide w/ bearings Guarder Poly Piston Head (GE-04-03) Guarder Stainless Steel Bushings (6mm) Systema Hop-up Bucking PDI-130 Spring
Due to the extended length of the "S" Model I was also to install a Prometheus M4 363mm long EG 6.03 inner barrel. The net result is 338 FPS at the same ROF using the 7.4V lipoly.
The STEN "S" is complete, I just need a decent camera. As soon as I can I will post better pictures. Be warned, The Sten "S" may look small but in reality the "S" model is 36" or 90cm long and it's no light weight. It shoots great now... I accidently killed the kitchen clock.
My goodies from IMA arrived today so I put them on my "S". I recieved a WW2 era STEN Sling and Repro STEN "S" wool lined Barrel heat grip cover. I'm Ready to hunt VC or SS IMA is quite good and shipping to HK from the US was super fast. www.ima-usa.com
MAKING THE "S" The silencer tube isn't just hollow. I created two large rings from 6mm PVC sheet and drilled them with a center 1/2" hole. I then installed a +/- 6" long 1/2" dia. piece of PVC tube between them... sort of like a barbell. The "barbell" was glued together using 5 minute two part epoxy.
The size of the rings were made to fit snug in the 40mm tube. Once the bar bell is complete it was set in slightly lower than the buisness end of the tube edge and fixed in place, again using 5 minute epoxy. I epoxied the appropriate size steel washer in the center to give me a perfect round hole. I then used epoxy putty, filled it then sanded it smooth. A little more body puddy, more sanding and then Tamiya flat black in several light coats... Done.
Why only a 6" inch inner extension you ask? Because if I had another STEN hop-up I can switch back to a Standard MKII in about 60 seconds. The origional outer barrel and barrel block are still in place. Installing the inner barrel and hop-up is easy and it's only one set screw away from doing so. However, the silencer is snug and firmly in place without a hint of wobble.
Nice Stens those reenactors are sporting. I see MKII, III and V models. I assume the are deacts since it's a UK link. Smoky's used to make a MKV conversion years ago. I remember Armed Forces had one in their shop window for years.