Winchester Shotgun

The Winchester Model 21 hammer-less double-barrel shotgun, introduced in 1931, was the first arm of this type manufactured by the Winchester firm. Earlier double-barrel shotguns bearing the Winchester name were made in England and were sold in the Winchester organization's retail store in

Winchester Shotgun

New York from 1879 until 1884.

The frame of the Model 21 shotgun is of one-piece construction and is made from a forging. The barrels are mechanically interlocked by dovetail half-lugs on each barrel. Coil springs are used to operate the hammers and selective ejectors. A floating barrel stop is pro vided on the forward part of the lug to prevent battering of the hinge.

The Model 21 was produced initially with double trigger, but the single-trigger version followed shortly thereafter.

Production chronology of the Model 21 is complicated by the fact that manufacture of the standard-grade gun was

Parts Legend

1. Frame

2. Top-lever

3. Upper tang screw 3A. Upper tang screw bushing (not shown; see Fig. 1)

4. Safety slide

5. Safety slide spring stop pin

6. Safety slide spring

7. Top-lever plunger

8. Top-lever spring

9. Locking bolt

10. Locking bolt lever

11. Locking bolt lever screw

12. Sear, left

13. Sear, right

14. Sear pin

15. Sear spring, right

16. Sear spring, left

17. Sear spring screws (2)

18. Locking bolt catch

19. Locking bolt catch spring

20. Locking bolt catch spring plunger

21. Hammer, left

22. Hammer, right

23. Hammer pin

24. Cocking lever screw

25. Cocking lever, right

26. Joint pin

27. Cocking lever, left

28. Cocking lever screw nut

29. Cocking rod, left

30. Cocking rod, right

31. Hammer springs (2)

32. Trigger plate

33. Trigger plate tang screw

34. Trigger plate screw

35. Safety lever

36. Safety lever operating rod pin

37. Safety lever operating rod

38. Safety lever operating rod returning spring

39. Safety lever operating rod returning spring pin

40. Safety lever pivot pin

41. Timing weight

42. Timing weight pin

43. Timing weight plunger spring

44. Timing weight plunger

45. Trigger (shown assembled—comprises trigger, trigger blade and pin)

46. Shift lever spring

47. Trigger pin

48. Shift lever and shift lever button (shown assembled)

49. Trigger spring

50. Trigger spring plunger

51. Guard bow

52. Guard bow screws (2) 52A. Buttstock (not shown;

53. Forearm shoe

54. Ejection sear pin

55. Ejection hammer roll pin

56. Forearm retainer pin

57. Forearm catch pin

58. Ejection hammer roll

59. Ejection sear spring (2)

60. Forearm retainer

61. Forearm retainer spring

62. Forearm catch

63. Ejection hammer, right

64. Ejection hammer, left

65. Ejection hammer springs (2)

66. Ejection hammer spring guide rods (2)

67. Ejection sear, left

68. Ejection sear, right

69. Forearm recoil abutment

70. Forearm recoil screw

71. Forearm catch plate

72. Rear forearm screw

73. Front forearm screw

74. Forearm catch spring

76. Barrels

77. Extractor, left

78. Extractor, right

79. Locking bolt stop screw

80. Extractor stop screw

81. Barrel stop

82. Barrel stop spring

83. Barrel stop screw

84. Extractor plunger stop pin

85. Extractor plunger

86. Front sight

87. Rear sight

Beretta Safety Roll PinShotgun Barrel Locking SpringGauge Firing Mechanism

4 Trigger assembly. The assembled trigger mechanism contained in the trigger plate (32) is shown here to illustrate proper relationship of parts. Trigger mechanism should be disassembled only by a competent gunsmith when necessary for replacement or repair of parts. Take care when reassembling trigger plate and trigger mechanism to underside of frame that locking bolt catch spring plunger (20) is properly seated in its hole in top side of trigger plate

J C Barrel assembly. With barrel separated from frame (1) and 1 J wood forearm (75), remove extractor stop screw (80) and locking bolt stop screw (79) from barrel lug. Remove barrel stop screw (83) and spring (82). Remove left and right extractors (77, 78) and barrel stop (81). Drift out extractor plunger stop pin (84) and remove extractor plunger (85) from front end of barrel lug

2 Major components. The major components of the arm after basic takedown are shown here. For everyday, normal cleaning, disassembly beyond this point should seldom, if ever, become necessary

3 Forearm assembly. Remove rear and front forearm screws (72. 73) from forearm catch plate (71) on underside of forearm (75). Remove forearm recoil screw (70) and abutment (69). Forearm shoe (53) may be separated frofti forearm. Further disassembly of shoe is not recommended and seldom necessary discontinued in 1959. It has been available since January 1960 on a custom basis only. It is now made in 12-, 16-, and 20-ga. only, but was formerly also available in 28-ga. The custom-built gun now offered can be obtained in 3 basic grades, which are designated Custom Grade, Pigeon Grade, and Grand American Grade.

Prior to January 1960, the Model 21 was offered in a variety of standard styles covering every conceivable taste and style of shooting. Custom-built guns were also offered, but even the standard style guns were furnished with special dimension stocks (within certain limits) at no extra charge.

Manufacture of the Model 21 with plain extractors was discontinued in 1941. Manufacture of the double trigger version was discontinued in 1944. After Jan. 1, 1950, the Model 21 was produced in single trigger, selective ejection style only.

Section. The section drawing shows relationship of all parts

Shotgun Hammer And Trigger Parts

6 To take down the assembled arm, hold gun inverted and push forearm catch (62) forward as shown at "A" while lifting up on front end of forearm (75). Separate forearm from barrels (76)

8 With barrels off. push top-lever (2) to right and press down on locking bolt catch (18) as shown at "A" in order to release locking bolt. Then release top-lever

Basic takedown is shown in Figs. 6, 7, 8, and 9. With the arm dismantled into its major components as shown in Fig. 2, disassembly of the action and frame assembly may be accomplished.

Remove guard bow screws (52) from underside of guard bow (51). Lift rear end of guard bow free of stock and turn guard bow 90°, withdrawing it from bottom of trigger plate (32). Remove upper tang screw (3), trigger plate tang screw (33), and trigger plate screw (34). Rap frame sharply with a wooden or plastic hammer to loosen trigger plate and remove it from bottom of frame (1). Disassembly of trigger mechanism contained in trigger plate is not recommended. (See Fig. 4.)

With trigger plate removed, buttstock (52A) may be drawn away from frame to rear. Remove sear spring screws (17) and right and left sear springs (15, 16)

Shotgun Single Selective Trigger Parts

7 Push top-lever (2) over to right swinging breech end of barrels upward. Lift barrels (76) up and off frame (1)

Rifle Gun Parts Winchester

9 In reassembling barrels (76) to frame (1), push top-lever (2) to right until it catches. Hold gun as shown. Notch in front of barrel lug at "A" must engage joint pin (26) in frame. Note that barrel stop (81) must be in seat in floor of frame before breech can be closed. Swing barrels up and lock. Place forearm against barrels with rear end of shoe (53) engaging cocking levers (25, 27) at front of frame. Press front end of forearm against barrels until forearm assembly locks into place, completing reassembly from underside of frame and withdraw locking bolt catch spring (19) and plunger (20) from locking bolt catch (18). Trip sears so hammers are in fired position and drift out sear pin (14).

Remove left and right sears (12, 13). Remove locking bolt lever screw (11) and pull top-lever (2) out top of frame. Remove locking bolt catch (18) and remove locking bolt lever (10), taking care to prevent forcible ejection of top-lever plunger (7) and spring (8). Remove cocking lever screw (24) and nut (28), dropping right and left cocking levers (25, 27) out front of frame.

Hammer springs are difficult to remove and disassembly of hammers (21, 22), hammer springs (31) and left and right cocking rods (29, 30) should only be undertaken by a competent gunsmith. Reassemble in reverse. ■

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  • Sophie
    How to remove a shotgun trigger assembly?
    7 years ago
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    How assemble a double barrel shotgun trigger?
    6 years ago
  • gerard
    How to construct local winchester gun trigger and spring and hammer?
    1 year ago

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