Expedient Homemade Firearms. BSP-SMG. B B S S P P 9 9 m m m m S S M M G G L L E E G G A A L L N N O O T T E E T T h h e e w w e e a a p p o o n n s s h h o o w w n n i i n n t t h h e e f f o o l l l l o o w w i i n n g g d d o o c c u u m m e e n n t t h h a a s s n n o o t t b b e e e e n n b b u u i i l l t t a a n n d d i i s s t t h h e e r r e e f f o o r r e e a a p p r r o o t t o o t t y y p p e e d d e e s s i i g g n n o o n n l l y y . . A A l l l l p p h h o o t t o o ’ ’ s s i i l l l l u u s s t t r r a a t t e e p p l l u u m m b b i i n n g g / / h h a a r r d d w w a a r r e e c c o o m m p p o o n n e e n n t t s s s s h h o o w w n n i i n n t t h h e e i i r r u u n n m m o o d d i i f f i i e e d d a a s s b b o o u u g g h h t t c c o o n n d d i i t t i i o o n n . . *For academic study purposes only. Expedient Homemade Firearms. BSP-SMG. BSP-SMG SCHEMATICS Expedient Homemade Firearms -1- T T h h e e 9 9 m m m m ‘ ‘ B B S S P P ’ ’ S S u u b b - - M M a a c c h h i i n n e e G G u u n n T T h h e e f f o o l l l l o o w w i i n n g g d d e e s s i i g g n n d d r r a a w w i i n n g g s s i i l l l l u u s s t t r r a a t t e e t t h h e e c c o o n n s s t t r r u u c c t t i i o o n n o o f f a a 9 9 m m m m s s u u b b - - m m a a c c h h i i n n e e g g u u n n u u t t i i l l i i z z i i n n g g o o f f f f t t h h e e s s h h e e l l f f ‘ ‘ B B r r i i t t i i s s h h S S t t a a n n d d a a r r d d P P i i p p e e ’ ’ ( ( B B S S P P ) ) F F i i t t t t i i n n g g s s . . B B S S P P f f i i t t t t i i n n g g s s , , c c o o m m m m o o n n l l y y k k n n o o w w n n a a s s ‘ ‘ M M a a l l l l e e a a b b l l e e I I r r o o n n F F i i t t t t i i n n g g s s ’ ’ , , a a r r e e r r e e a a d d i i l l y y a a v v a a i i l l a a b b l l e e f f r r o o m m m m o o s s t t g g o o o o d d t t r r a a d d e e p p l l u u m m b b i i n n g g o o u u t t l l e e t t s s . . B B e e c c a a u u s s e e t t h h i i s s B B S S P P m m a a c c h h i i n n e e g g u u n n d d e e s s i i g g n n u u s s e e s s s s o o m m e e o o f f t t h h e e s s a a m m e e c c o o m m p p o o n n e e n n t t s s s s e e e e n n i i n n ‘ ‘ E E x x p p e e d d i i e e n n t t H H o o m m e e m m a a d d e e F F i i r r e e a a r r m m s s ’ ’ V V o o l l u u m m e e I I , , I I h h a a v v e e n n o o t t d d i i s s c c u u s s s s e e d d t t h h e e i i r r m m a a n n u u f f a a c c t t u u r r e e a a g g a a i i n n h h e e r r e e , , f f o o r r f f e e a a r r o o f f b b o o r r i i n n g g t t h h e e r r e e a a d d e e r r , , a a n n d d m m y y s s e e l l f f . . T T h h e e m m a a g g a a z z i i n n e e a a n n d d m m a a g g a a z z i i n n e e w w e e l l l l b b e e i i n n g g t t w w o o e e x x a a m m p p l l e e s s . . T T h h e e f f o o l l l l o o w w i i n n g g d d e e s s i i g g n n i i s s o o f f f f e e r r e e d d o o n n t t h h e e u u n n d d e e r r s s t t a a n n d d i i n n g g t t h h a a t t t t h h e e r r e e a a d d e e r r i i s s a a l l r r e e a a d d y y f f a a m m i i l l i i a a r r w w i i t t h h t t h h e e f f i i r r e e a a r r m m c c o o n n s s t t r r u u c c t t i i o o n n m m e e t t h h o o d d s s s s h h o o w w n n i i n n m m y y p p r r e e v v i i o o u u s s ‘ ‘ E E x x p p e e d d i i e e n n t t H H o o m m e e m m a a d d e e F F i i r r e e a a r r m m s s ’ ’ b b o o o o k k s s . . I I w w i i l l l l l l e e a a v v e e t t h h e e r r e e a a d d e e r r t t o o d d e e c c i i d d e e w w h h e e t t h h e e r r t t h h i i s s d d e e s s i i g g n n i i s s g g o o o o d d , , b b a a d d , , o o r r s s o o m m e e w w h h e e r r e e i i n n b b e e t t w w e e e e n n ! ! M M A A T T E E R R I I A A L L S S R R E E Q Q U U I I R R E E D D 1 1 . . 1 1 - - 1 1 / / 4 4 ” ” B B S S P P t t u u b b e e x x 1 1 2 2 ½ ½ ” ” l l e e n n g g t t h h . . 2 2 . . 2 2 . . 5 5 m m m m s s t t e e e e l l s s h h e e e e t t ( ( x x 2 2 ) ) 9 9 - - ¾ ¾ ” ” l l e e n n g g t t h h . . 3 3 . . 4 4 0 0 x x 2 2 0 0 x x 2 2 . . 5 5 m m m m t t u u b b e e . . 4 4 . . 3 3 4 4 . . 9 9 3 3 x x 1 1 5 5 . . 8 8 8 8 x x 1 1 . . 6 6 m m m m t t u u b b e e 5 5 . . 2 2 0 0 g g x x 3 3 / / 8 8 ” ” s s p p r r i i n n g g s s t t e e e e l l . . 6 6 . . 1 1 / / 8 8 ” ” s s t t e e e e l l p p l l a a t t e e . . 7 7 . . ¼ ¼ ” ” “ “ “ “ 8 8 . . ¼ ¼ ” ” “ “ “ “ 9 9 . . 5 5 / / 8 8 ” ” x x 1 1 4 4 g g s s t t e e e e l l s s h h e e e e t t . . 1 1 0 0 . . 6 6 m m m m s s t t u u d d d d i i n n g g c c o o n n n n e e c c t t o o r r s s x x 2 2 . . 1 1 1 1 . . 6 6 m m m m c c a a p p s s c c r r e e w w s s x x 4 4 . . 1 1 2 2 . . D D o o w w e e l l p p i i n n s s , , 4 4 & & 6 6 m m m m d d i i a a . . 1 1 3 3 . . 1 1 ” ” x x 1 1 / / 8 8 ” ” r r o o u u n n d d t t u u b b e e . . 1 1 4 4 . . 3 3 5 5 m m m m d d i i a a ’ ’ r r u u b b b b e e r r s s t t o o c c k k . . 1 1 5 5 . . 1 1 ¼ ¼ ” ” x x ½ ½ ” ” B B S S P P R R e e d d u u c c e e r r . . 1 1 6 6 . . ½ ½ ” ” B B S S P P S S o o c c k k e e t t . . 1 1 7 7 . . ½ ½ ” ” B B S S P P L L o o c c k k N N u u t t . . 1 1 8 8 . . ½ ½ ” ” B B S S P P T T h h r r e e a a d d e e d d T T u u b b e e . . 1 1 9 9 . . 1 1 ¼ ¼ ” ” B B S S P P C C a a p p . . 2 2 0 0 . . 1 1 5 5 . . 8 8 8 8 x x 3 3 . . 2 2 5 5 m m m m H H y y d d r r a a u u l l i i c c t t u u b b e e . . 2 2 1 1 . . A A s s s s o o r r t t e e d d n n u u t t s s a a n n d d b b o o l l t t . . Expedient Homemade Firearms. BSP-SMG -2- 1. 15.88 x 3.25mm tubing. 2. ½ ” BSP Socket. 3. ½ ” BSP nipple. 4. ½ ” BSP lock nut 5. 1 ¼ ” x ½ ” BSP reducer. 6. Magazine Catch. 7. Magazine. 8. Trigger. 9. Trigger Bar. 10. Bolt. 11. Sear. 12. Mainspring. 13. Stock anchor point. 14. 1” Diameter x 1/8” tube. 15. Rubber buffer. 16. 1 ¼ ” BSP pipe Cap. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 Expedient Homemade Firearms. BSP-SMG -3- T T E E M M P P L L A A T T E E S S (Internal Components. Hole Diameters Arrowed) Sear. 1/8” Plate. Trigger Bar. ¼” Plate. Trigger. ¼” Plate Magazine Well. 40 x 20mm Tube. Trigger Guard. 14 gauge sheet steel. Mag azine Catch. 20 gauge spring steel. Magazine Stop. 40 x 20mm Tube. 66 mm 6mm 3.8mm 3.8mm 4mm 4mm Expedient Homemade Firearms. BSP – SMG. -4- L L O O W W E E R R R R E E C C E E I I V V E E R R T T E E M M P P L L A A T T E E (Hole diameters shown in millimetres) The lower receiver is composed of two receiver side - plates, each being 9¾’’ in length. Each plate is identical. Each side - plate is cut from a length of 2.5mm thick steel sheet to the shape of the above template. The square recess shown in figure ‘A’ is the anchor point for the shoulder stock. This measures ½’’ square. Note: If the template is not 9¾’’ in length when printed, it may be enlarged using a photocopier until the necessary length is achieved. 9 ¾ ’’ 6mm 4mm 4mm 6mm 2.5mm steel Sheet. A. Expedient Homemade Firearms. BSP-SMG. -5- L L O O W W E E R R R R E E C C E E I I V V E E R R A A S S S S E E M M B B L L Y Y To create the lower receiver assembly, the two receiver side - plates are joined together by spacing them between two 6mm studding connectors, (A and B). Four dome head ca p screws are then screwed into the connectors and thoroughly tightened, effectively holding the assembly together. The two connectors must be exactly 20mm in length. As bought, 6mm connectors are usually this exact length, but if they are not, they may be trimmed on a lathe until the required length is achieved. A section of steel plate measuring 20 x 20mm is now silver soldered between the two side - plates in the position shown at ‘C’ below. The plate should be ¼ ” thick. A gap of 2mm should now exist betw een the plate and the end of the receiver. Top View Side View STIDDING CONNECTOR ‘A’ STUDDING CONNECTOR ‘B’ 2.5mm C. Expedient Homemade Firearms. BSP-SMG -6- The lower receiver template is attached to a section of 2.5mm steel plate. Two receiver side - plates are required. Two studding connectors are used to hold the side - plates together Expedient Homemade Firearms. BSP-SMG - 7- L L O O W W E E R R R R E E C C E E I I V V E E R R : : W W E E L L L L A A N N D D G G U U A A R R D D F F I I T T T T E E D D The magazine well is inserted into the receiver and welded in place along points ‘A’ and ‘B’. Note: Do not weld along opposite side of point ‘B’. It must be ensured before welding that the top edge of the well is 7mm above the top edge of the receiver. 7mm B A C D 27mm 103mm 5/8” Trigger Guard 9x7mm 3mm The trigger guard is made from a 103mm length of 5/8” steel sheet. This sheet should be 5/8” wide. The guard is formed to the shape of the template on page 3. A hole measuring 9x7mm is cut through the guard, 27mm from its front edge. This hole will accept the lower leg of the trigger. The guard is silver soldered in position at points ‘C’ and ‘D’. Expedient Homemade Firearms. BSP-SMG - 8- P P I I S S T T O O L L G G R R I I P P The grip is the next part to make. It is made from a 112mm length of 40 x 20mm tubing. A 5.8mm diameter hole is drilled through the grip in the position shown in the accompanying grip template. Before the grip is fixed to the receiver the sear must be made and fitted. See page 8. 112mm 5.8mm Grip Template [...]... BSP- SMG -1 5- Bolt Handle UPPER RECEIVER SHOWN WITH TEMPLATE Expedient Homemade Firearms BSP- SMG -1 6- BSP- 9mm SMG UPPER RECEIVER TEMPLATE Expedient Homemade Firearms BSP- SMG PHOTO OF TEMPLATE ATTACHED TO UPPER RECEIVER TUBE The template is attached to the upper receiver tube to allow the necessary recesses to be marked onto the tube -1 7- 1 ¼” Cap 1 4-3 /8” 12 ½” 1 ¼” BSP Tubing UPPER RECEIVER 1 -1 8Reducer... RECEIVER 1 -1 8Reducer ¼” x ½” Thread Length: 1-1 /8” Expedient Homemade Firearms BSP- SMG Expedient Homemade Firearms BSP- SMG ASSEMBLING THE BARREL The BSP nipple, socket, and lock nut assembly are screwed into the reducer The assembly is then thoroughly tightened The barrel tube is inserted into the BSP barrel assembly -1 9- Expedient Homemade Firearms BSP- SMG PHOTO OF BARREL COMPONENTS The barrel is... this measurement is achieved The template is attached to a length of 34.93 x 15.88mm tubing 9” Expedient Homemade Firearms BSP- SMG A 34.93 x 15.88mm plastic tube cap is used to seal off the bottom of the magazine -2 5- Expedient Homemade Firearms BSP- SMG As shown in Expedient Homemade Firearms -The 9mm Sub-Machine Gun, the magazine is made from a section of 34.93 x 15.88mm rectangular tubing As a design... combined length of 4 – 5mm -2 9 - Expedient Homemade Firearms BSP- SMG- REAR VIEW OF WEAPON SHOWING SHOULDER STOCK ATTACHED TO RECEIVER Upper Receiver Grip Shoulder Stock Insert cotter pin into hole to hold shoulder stock in place -3 0- Expedient Homemade Firearms BSP- SMG SHOULDER STOCK The clockwise and Anti-clockwise selector switch The selector switch is rotated either clockwise or anti-clockwise to allow... retained with two dowel pins GRIP ASSEMBLY FITTED Expedient Homemade Firearms BSP - SMG FULLY ASSEMBLED LOWER RECEIVER Expedient Homemade Firearms BSP - SMG -1 3- We can now begin construction of the upper receiver! Expedient Homemade Firearms BSP- SMG PHOTO OF UPPER RECEIVER COMPONENTS The upper receiver assembly consists of a 1¼” BSP tube (screwed at both ends) and fitted with a Cap and Reducer, as photo... tube (Spring Guide) 12 -2 1- 25mm Expedient Homemade Firearms BSP- SMG ALTERNATIVE BOLT CONSTRUCION METHOD An alternative to machining the SMG bolt would be to assemble it from the components illustrated below ‘J’ / Hook bolt 8mm bolt section and nut Stack of washers ½” spring pin The components are fitted to the 8mm bolt section as shown below -2 2- Expedient Homemade Firearms BSP- SMG The ½” spring pin... plate Magazine Tube Cap Pins Expedient Homemade Firearms BSP- SMG FITTING A SHOULDER STOCK It is quiet possible to construct a simple folding shoulder stock for the BSP machine gun using nothing more than a modified 3/8” ratchet spanner and a length of steel tubing! The following pages illustrate how this is done Folding Shoulder Stock -2 7- Expedient Homemade Firearms BSP - SMG PHOTO OF SHOULDER STOCK... increasing or reducing the length of the stock tubing prior to final assembly Side lever grease applicator and internal spring -3 2- Expedient Homemade Firearms BSP- SMG 4 Ejector; The ejector of the BSP SMG is identical to that shown in Expedient Homemade Firearms, The 9mm Sub- Machine Gun It consists of a modified 8mm diameter bolt and nut 5 Barrel Assembly; The hydraulic tubing used during barrel construction... -9 - Expedient Homemade Firearms BSP- SMG TRIGGER 4mm Dowel Pin Rear Pin must protrude 6mm from each side of trigger Rear View The trigger is made from a section of ¼” thick steel plate A 4mm diameter dowel pin (a spring pin could be used as a substitute) is tapped into the 3.8mm hole The pin must protrude 6mm from each side of the trigger when fitted -1 0- Expedient Homemade Firearms BSP- SMG FITTING THE... COMPONENTS The barrel is assembled from a 9” length of 15.88 x 3.25mm hydraulic tubing, a 1¼” BSP Reducer, ½” BSP Lock nut, ½” BSP Socket, and a ½” BSP Nipple (threaded tube) Hydraulic tube Nipple Reducer Nut Socket Screwing the barrel assembly onto the upper receiver -2 0- Expedient Homemade Firearms BSP- SMG BOLT ASSEMBLY The bolt is machined to the following dimensions from a suitable section of round . TEMPLATE Expedient Homemade Firearms. BSP- SMG - 1 7- P P H H O O T T O O O O F F T T E E M M P P L L A A T T E E A A T T T T A A C C H H E E D D T T O O U U P P P P E E R R . 15 16 Expedient Homemade Firearms. BSP- SMG -3 - T T E E M M P P L L A A T T E E S S (Internal Components. Hole Diameters Arrowed) Sear. 1/8” Plate. Trigger Bar. ¼” Plate. Trigger. . The sear is made from mild steel and should be case hardened after final shaping. 4mm dowel pin TOP Right Side 6mm 8mm Sear- Right Side. Expedient Homemade Firearms. BSP- SMG - 1 0-