Sten Mk II PARTS LIST. 27. Bolt 28. Firing pin 29. Extractor 30. Extractor spring 31. Extractor pin 32. butt plate stock grip stock ring

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1 Sten Mk PARTS LST. Barre 2. Barrel sleeve 3 Barre sleeve lock 4. Barre sleeve lock spring 5. Front sight 6. Barrel bushing 7. Receiver tube 8. Receiver cap 9 Trigger housing lb. Butt stock assembly: stock tubing : i butt plate stock grip stock ring. Magazine housing 2. Magazine housing spacer 3. Magazine housing spacer screw 4. Magazine latch 5. Magazine latch spring 6. Trigger 7. Trigger spring 8. Trigger pin 9. Disconnector 20. Disconnector pin 2. Selector 22. Selector spring 23. Selector plunger (2) 24. Sear 25. Sear syring 26. Sear 27. Bolt 28. Firing pin 29. Extractor 30. Extractor spring 3. Extractor pin Closing spring 34. Closing spring cup 35. Trigger housing cover 36. TrigF: housing cover screw (2) 37. Magazine houskg 38. Magazine follower 39. Magazine spring 40. Magazine spring latch 4. Magazine botiom 42. Rear sight NOTES:. Bolt stopping surface on barrel is lmm forward of magazine well slot. 2. Bolt stroke is 35mm.

2 f- Receiver tube Material: seamless steel tubing q$ _ / /--/,> 6 \ /+, m _ / / / i- _:i <. f- _-_- _ - ~ - 0 cc? -_--_Add;L

3 .5R typ. \ (\--me---s--b -e-v--.._ _(. --a--_!ss 5 k c_ Main spring cap Material: mm stock Scale: : Receiver rear end bushing Material: AS 00 or equivalent Scale: :! r \ r- 20R - f J_ 2.5

4 2 R Barrel hushing Material: 440 Scale: Barrel sleeve / minor Barrel sleeve latch Rear sight Note: Stake at assembly with magazine housing

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6 Magazine housing Material: as notted Scale: : * ft 4 - r--r 2 3 * -y 44! 70 i i i - t b-j Steel stc. 2.7 ref. /- Weld.O ref.

7 Magazine latch. Material: AS 00 or equivalent 2.7mm stock. Case harden O.lmm deep Scale: : T \ \ 3R typ. 4 7 [- 9.5 r ==7.2 Magazine housing spacer Material: AS 00 or equivalent 3mm stock. Heat treat: none Scale: : &O-32 drill & / 7 : 23

8 Barrel Material: AS 440 Harden to: Br _ - - _ )--_ - A_, b 28 ~4 23 d J Twist: /250mm R- of 6 Number grooves: Groove width: Bore diameter: 8.M +.02 Rifling diameter: ! - s rpf_ + _ 02 _~

9 . b. STEN Mk SPECFCA-TONS. Cartridge: 9mm Parabellum Bullet weight Powder weight Muzzle veiocity 6 grains 6 grains 400 ft./set. 2. Recoil Spring: Wire diameter in, Spring OD.00 in. Active coils 5 Free length 9.40 in. nitial length 6.80 in. Finai length 3.20 in. Work stroke 3.60 in. 3. Bolt: Weight (including extractor) Cocking handle.327 ib. (9290 grains) lb. (540 grains) Total recoiling weight:.404 lb. (9830 grains) Bolt maximum dia..38 in. Bolt overall dia in. Bolt body length 4.2 in. SUGGESTED STEN MANUFACTURNG NiODFiCATONS Select suitable lightwall steel tubing which is commercially available. For example, a -fence post pipe (galvanized) is 38.5mm OD and 35.0mm D, most suitable for use as a receive:. Eliminate barrei sleeve. Weld barrel bushing into the front end of the receiver for simple, permanent assembly. Turn barrel blank OD (outside diameter) without any shoulder, fit the barrel in the bushing by sliding fit. Fasten the barrel in the bushing by two roll pins of 3/6 diameter, or equivalent. Turn the bolt OD to fit the receiver D. The external portion of the cocking handle (sticking out of the receiver) may be a straight 8.8mm OD, the same as the inside. 8. The trigaer housing cover acts only as a guard against birt entering the trigger assembly. This ccj<er can be eliminated or made from plastic. 9J. Ati pins can be roll pins of standard commerciai size, or pieces of drill rod. 3. All springs can be of a standard commercial size... Trigger material may be aluminum or plastic, side tabs may be replaced by spacers or washers to keep the trigger located neutrally. 2. l-7/4 diameter nominal size galvanized pipe, schedule 40 is suitable for a modified receiver: 3D D:: 42.2mm 35.05mm YVa thickness: 3.55mm Ncte: A galvanized pipe fits loosely inside a l-/4 pipe and can be welded as a filler-spacer where needed,

10 Extractor Material: AS 040 or equiv., stock 4.7 wide Scale: 4.5 : harden to: Rc W\ 2 0 / -- &5R \ , Bolt handle Scale: 37 : Material : mild steel Heat treat: none 2-6R Selector Scale:.a7 :?Aateria!: mi!d steel Heat treat : none

11 Trigger housing cover Material: lmm stock, formed Required: Scale: : c t- 39 t A Sten screws are lo-32 thread, round head type. Trigger housing screws (2) are 3mm long.

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13 -.. Trigger housing Scale:.87 : &aterial: 2.5mm stock Rewired: 2 -r 42 - & L 6.5rj Material: 2.5mm stock Required: each \

14 xote: Trigger pin may be substituted by spring pin 3. # by 26 long. 5.5 R ref. 3. # wire C.WR Firing pin Material: Drill rod Harden to Rc 50 PNS (Spring pins) USE DAMETER LENGTH Extractor Sear

15 SPRNGS USE SUBSTTUTE : Extractor 7. 2 %. LC-04oc-4 Magazine latch Gr. LC-OLZOC-6 Closing sq. - Trigger Extension spring LE-026B-7 or loops LE-026C-8 Selector Gr. LC-Oi8B-6 Barrel sleeve latch Sq. Sear spring, formed substitute LT-059K--R f- 3.5 coils,.6 fi wire Lee Spring Company, 30 Mail; St., Brookly;, >A! 20: zd,alog Xo. 2/970

16 Scale:.87 : Trigger Material: AS 00 or equivalent,,.6mm stock Heat treat: none Scale:.8 7 : 3.8 ; 7. ) 6.6

17 Trigger assembly Top view r r----i= i ; L L m-- - m=l - - L -Y---- Sear pin Sear lever 7 / \\ J \ / \ \ 4 \ \ \ - \ \ l rlgger spring. \ -lr--- \ ).i -/ ----mm / \ -- - m Bottom view

18 Sear Material: AS 440 or equivalent Harden to Rc 55 Scale: : L 3. $ driil rod Y R

19 i --_ Top view r Magazine Material: lmm steel stock Rear view Front view f 3.2R Bottom view

20 Magazine follower Material: low carbon steel Scale: : 3.6R (ciearance for magazine body) \ i -_-- we ref. -+ Note: The *magazine follower is a compks stamping made on a progressive die. To make a follower in a simpler way is to follow the Degtyarev DP LAG approach - using a dummy round as the last one in the magazine. Thus a simple, flat follower with a dummy round soldered and/or screwed to it will replace a complicated stamping.

21 w- 0 : R ref. Vagazine spring Material: Music wire.5mm dia. - \ ,-_ / Over-all length: 33 Number of.coils: 26 r / r 6.5R Scale:.87 : P Magazine bottom retainer Material : lmm mild steel 5 L 6. 5R 3 Retaining lip bent over magazine spring tab at assembly r 3 Magazine bottom plate Material: lmm mild steel Sale: -87 :

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