Kbailey Build Tutorial

52
1 M2/M3HB, .50 Cal, Semi-Auto, Browning Machine Gun Build Tutorial Index INDEX 1 INTRODUCTION 2 TOOLS 3 PARTS SET 12 PREP WORK 19 ASSEMBLY 32 BUCKING AND PNEUMATIC RIVETING BY TANKER 46 M2HB BOLT HOLD OPEN BY OUCHMAN 49

Transcript of Kbailey Build Tutorial

Page 1: Kbailey Build Tutorial

1

M2/M3HB, .50 Cal, Semi-Auto,

Browning Machine Gun Build Tutorial

Index

INDEX 1

INTRODUCTION 2

TOOLS 3

PARTS SET 12

PREP WORK 19

ASSEMBLY 32

BUCKING AND PNEUMATIC RIVETING BY TANKER 46

M2HB BOLT HOLD OPEN BY OUCHMAN 49

Page 2: Kbailey Build Tutorial

2

Introduction

This tutorial was made to assist in the building of legal Semi-Auto Browning Machine Guns, Cal. 50, M2/M3HB’s. It was made with the assumption that anyone attempting to manufacture such a large and powerful weapon has some mechanical aptitude and experience in the construction of firearms. Not every step in the construction process has been documented and it is recommended that you contact your Semi-Auto parts manufacturers with any build questions. Neither the creator of this tutorial, nor the owner/operator of M2HB.Net should be held liable for any accidents associated with the construction of a M2/M3HB. (Build at your own risk.) Of course, this is for adults only, and no children under the age of 18 should be building firearms. This tutorial was made possible by the following: The owner and members of M2HB.net Christos Gryphos (M3HB Parts Kit Supplier) Karma Metal Products (Semi-Auto trigger, sear, side plate, bolt machining) Toolbox82 (Machining of internals for KMP semi parts) Tom Sawyer MFG. (Engraving) Plinker762 (Riveting jigs) Tanker (Bucking bars) Dieseldr (machining assistance and guidance) Crane Technologies (M2 cocking bracket rivets) Sarco (.50 Cal. rivet set, retracting slide group) McMaster-Carr (Rivets) Gun Parts Corp. (M2 breech lock, sear spring, sear stop) Thank you, kbailey3

Page 3: Kbailey Build Tutorial

3

Tools The following tools were used for the construction of the M3HB in this

tutorial.

Page 4: Kbailey Build Tutorial

4

Page 5: Kbailey Build Tutorial

5

Page 6: Kbailey Build Tutorial

6

Page 7: Kbailey Build Tutorial

7

Page 8: Kbailey Build Tutorial

8

Page 9: Kbailey Build Tutorial

9

Page 10: Kbailey Build Tutorial

10

Page 11: Kbailey Build Tutorial

11

Page 12: Kbailey Build Tutorial

12

Parts Set The following pictures are for general reference only. For complete

assembly/disassembly of the M2/M3HB parts, please consult a Military Technical

Manual. (TM 9-1005-303-23 recommended)

Page 13: Kbailey Build Tutorial

13

Page 14: Kbailey Build Tutorial

14

Page 15: Kbailey Build Tutorial

15

Page 16: Kbailey Build Tutorial

16

Page 17: Kbailey Build Tutorial

17

Page 18: Kbailey Build Tutorial

18

Page 19: Kbailey Build Tutorial

19

Prep Work

Page 20: Kbailey Build Tutorial

20

Page 21: Kbailey Build Tutorial

21

Page 22: Kbailey Build Tutorial

22

Page 23: Kbailey Build Tutorial

23

Page 24: Kbailey Build Tutorial

24

Page 25: Kbailey Build Tutorial

25

Page 26: Kbailey Build Tutorial

26

Page 27: Kbailey Build Tutorial

27

The following four pictures are not needed for the KMP ATF approved design. Welding-

up of the Left Side Plate Side Mount Trigger Hole is part of TNW’s approval. I welded

my plate just to be safe. With KMP’s semi-auto sear design, the ability to use the side

trigger has been eliminated.

Page 28: Kbailey Build Tutorial

28

Page 29: Kbailey Build Tutorial

29

Page 30: Kbailey Build Tutorial

30

Page 31: Kbailey Build Tutorial

31

Page 32: Kbailey Build Tutorial

32

Assembly If you have no experience with riveting, please practice. My experience was with the

1919A4. My 1919 builds were done with one of Plinker762’s riveting jigs. When I

started the M3HB project, I soon realized that the 1919 jig would not work for the M3.

So, I purchased an air compressor and jumped right into air hammer riveting. As you can

see from the pictures below, that was mistake. I put “smile faces” all over the receiver

box.

Page 33: Kbailey Build Tutorial

33

I cleaned up the mistake and contacted Plinker for a new riveting frame.

Page 34: Kbailey Build Tutorial

34

The following was posted in the M2HB.net Riveting section on 12/02/2005: �³)RU�P\�0��EXLOG��,�RULJLQDOO\�ERXJKW�WKH�6DUFR�5LYHW�VHW��EXW�IRXQG�PRVW�RI�WKHP�WRR�KDUG�WR�VPDVK��0\�QH[W�VWHS�ZDV�WR�IROORZ�WRPWV�OHDG�DQG�ERXJKW�ULYHWV�IURP�0F0DVWHU�&DUU��6LQFH�ZH�FDQW�JHW�RQ�WKH�ROG�ERDUG��,�ZLOO�UHW\SH�ZKDW�ZDV�SULQWHG�IURP�WKH�ROG�IRUXP����WRPWV�SRVW�RQ�ULYHWV�SULQWHG��������������2.��)LQDOO\����PFPDVWHU�FDUU���LV��������������WKH������[�����ULYHW�SDUW���LV������D������KHUH�LV�KRZ�L�GLG�PLQH��\RXUV�PD\�EH�GLIIHUHQW�VR�VHH�SUHYLRXV�SRVW������UHDU�ULYHWV�����SFV�������XQGHU�WKH�KHDG��EROW�KROG�EDFN�����SFV�DV�LV������XQGHU�KHDG���IURQW�ERWWRP�����SFV������XQGHU�KHDG���IURQW�SDZO�EHOW�KROG�EUDFNHW����SFV�����XQGHU�KHDG���L�XVHG���������VWUDLJKW�SLQV��QRW�DYDLODEOH�IURP�PF�F��FXW�WR�������RYHUDOO�OHQJWK���L�FXW�WKH�KHDGV�IURP���ULYHWV�DQG�XVHG�WKHP�DV�WKH�GRPPHG�KHDG����WKLV�RQHV�D�OLWWOH�WULFN\���KRSH�WKLV�KHOSV�\RX�DOO�RXW��WKDQNV��WRPW����,�EHOLHYH�WRPW�EXFNHG�KLV�0��DQG�SXVKHG�KLV�ULYHWV�LQ�IURP�WKH�RXWVLGH��WKXV�VPDVKLQJ�WKHP�LQWR�WKH�FRXQWHUVLQN�LQVLGH�WKH�UHFHLYHU�ER[��:LWK�P\�EXLOG��,�XVHG�WKH�VDPH�WHFKQLTXHV�DV�EXLOGLQJ�WKH�����$��ZLWK�3OLQNHUV�ULYHWLQJ�MLJ��6PDVKLQJ�DQG�IRUPLQJ�WKH�ULYHW�KHDG�RQ�WKH�RXWVLGH�RI�WKH�JXQ��7KH�ULYHWV�XVHG�LQ�P\�EXLOG�DUH�DV�IROORZV����)URQW�3DZ�%UDFNHWV�±�4W\����6DUFR�ULYHWV�FXW�WR�VPDVK�DQG�JULQG�IOXVK����,�UHPRYHG�WKH�/63�SDZ�EUDFNHW�WR�GULOO�KROHV���%UHHFK�/RFN�'HSUHVVRU�±�4W\����±�6DUFR�5LYHWV�FXW�WR�VPDVK�DQG�JULQG�IOXVK���%DFN�7RS�3ODWH�±�4W\�������0F0DVWHU�&DUU�5LYHWV�FXW�WR�����´�SURWUXVLRQ��%DFN�%RWWRP�3ODWH�±�4W\�����±�&UDQH�7HFKQRORJLHV�ULYHWV�FXW�WR�����´�SURWUXVLRQ��)URQW�%RWWRP�±�4W\�����±�0F0DVWHU�&DUU�5LYHWV�FXW�WR�����´�SURWUXVLRQ��)URQW�/RQJ�7UXQQLRQ�±�4W\����±�6DUFR�5LYHWV�FXW�WR�����´�SURWUXVLRQ��7RS�3ODWH�7ULJJHU�%UDFNHW�±�4W\����±�&UDQH�7HFKQRORJLHV�5LYHWV���7KHUH�ZDV�TXLWH�D�ELW�RI�WULDO�DQG�HUURU��VR�WKH�RQO\�WKLQJ�,�FDQ�UHDOO\�VD\�WR�KHOS�LV��*RRG�/XFN�³�

Page 35: Kbailey Build Tutorial

35

Page 36: Kbailey Build Tutorial

36

Page 37: Kbailey Build Tutorial

37

Page 38: Kbailey Build Tutorial

38

Page 39: Kbailey Build Tutorial

39

Page 40: Kbailey Build Tutorial

40

Page 41: Kbailey Build Tutorial

41

Page 42: Kbailey Build Tutorial

42

Page 43: Kbailey Build Tutorial

43

Page 44: Kbailey Build Tutorial

44

Page 45: Kbailey Build Tutorial

45

For information on the barrel support shim or any other adjustment/set-up on the

M2/M3HB, please visit M2HB.net.

Page 46: Kbailey Build Tutorial

46

Bucking and Pneumatic Riveting by Tanker

Bottom Plate

Page 47: Kbailey Build Tutorial

47

Bottom Trunnion

Cocking Bar Bracket to Top Plate

Page 48: Kbailey Build Tutorial

48

Pneumatic Riveting

Page 49: Kbailey Build Tutorial

49

M2HB Bolt Hold Open by Ouchman

Page 50: Kbailey Build Tutorial

50

Page 51: Kbailey Build Tutorial

51

Page 52: Kbailey Build Tutorial

52

As discussed on M2HB.net, the highlighted portion of the trigger bar should be removed

so the straight pin can be removed with a punch. The punch tip is inserted into the Right

Side Plates 5/32 hole near the rear of the receiver box.