Hi to all, apologize my poor English.
Allow me some remarks to DUO pistols:
The name of the manufacturer is Dušek - "š" sounds like "sh" in "ship".
The name of the town is "Opočno" - "č" sounds like "cz" in "czech" or "ch" in "check".
Nickel plated pistols are original from the factory (nickel, NOT chrome plated). According to propagation materials of the Dušek factory, "luxurious" pistols should be made in pre-war years, nickel plated and with mother-of pearl grips. No such pistol is known until now. Also from the year 1941 only black pistols are known until now. Nickel plated pistols are known from the year 1945 and later, they were more common from the year 1946. To a nickel plated gun allways belongs a nickel plated magazine. Grips exists in black, reddish-brown and white. Until 1948 black and brown grips were used, also on nickel plated pistols. White grips appears on nickel plated pistols from the year 1948.
My DUO is from the year 1951, originally with reddish-brown grips, but I think, that it looks better with the white ones...
Field stripping an reassembling (for MNBinPDX
):
1. Remove the magazine. (pict.1)
2. Turn safety lever backwards. (pict.2+3)
3. Push the slide backwards, until the safety lever "snaps" into it. (pict.4+5)
4. Turn the barrel 1/4 turn. (clockwise from front) (pict.6+7)
5. Push slide a bit back, pull safety lever a bit down and let the slide come to front. (pict.8)
6. Pull the slide down and remove the springs. (pict.9)
7. Remove the firing pin. (pict.10)
8. Remember the correct position of the firing pin - "square pin" in the slide. (pict. 11+12)
9. Turn the barrel 1/4 turn (ANTIclockwise from front) (pict.13+14)
10. Lift the back end of the barrel (maybe with a screwdriver) and push the barrel backwards from the slide. (pict. 15)
11. You´re finished... (pict. 16)
Reassembly:
Barrel into the slide, turn it clockwise so, that the back "teeth" comes correct into the slide window. Insert firing pin correctly into the slide, then the firing spring. Insert the main spring into the body. Turn the safety lever backwards. Insert the slide to the body, control the position of springs and push the slide backwards, until it "snaps" to the safety lever. Turn the barrel anticlockwise, until the "teeth" comes into the body. Push slide a bit back, turn safety lever to front and let the slide come to front.
Sorry for the big amount of pictures, will send it in two parts. I wil send also the original material with parts list - this belongs to the pistol DUO "Z", but is the same as the old DUO, only the grips are the "modern" ones.
I can send to You scans from the book "Československé pistole 1918-1950" (Czechoslovak pistols 1918-1950) - Mladá Fronta 2006, ISBN 80-204-1550-5, from Jan Skramoušský and David Pazdera, and also scans from "Střelecký magazín" (Shooters Magazine), all concerning the DUO pistol, where You can find a lot of informations and pictures, but this is all in Czech language...