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the revolvers of willi korth - larvatus prodeo
May 10th, 2013
07:02 pm

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the revolvers of willi korth
Willi Korth was born in Stargard / Pommern on 11 July 1913. He learned machining and toolmaking at the Deutsche Reichsbahn between 1930 and 1934. Ten years later, in the summer of 1944, he briefly worked at Mauser-Werke under contract as an independent designer of military small arms. In August of 1950 Korth moved to Ratzeburg. Next year he found a job as a manager at the Hubertus Metallwerke in Mölln. In 1952 Korth resigned to pursue his own designs. His first effort was a blank firing gas revolver. The few gas revolvers, designed and manufactured by Korth in the winter of 1954/55, are now sought after as collector’s items.
    On 1 October 1955, following the expiration of the postwar ban on German manufacture of firearms, Korth founded a company in Ratzeburg under the name of Willi Korth, Waffenfabrikation. In September of 1955 Korth exercised his first manufacturing license for firearms. In 1962 he designed and manufactured his first revolver, initially chambered in .32 S&W Long, the highest caliber allowed by the terms of his license. Instead of a traditional cylinder release on the left hand side of the frame, the cylinders of these revolvers were unlatched from the frame by pulling forward the head of the ejector rod. The crane lock was released by the leftward push of a button located on the right hand side of the frame under the cylinder, whereupon the entire crane assembly complete with the cylinder would slide forward for removal from the frame.
    The first series production of Korth revolvers began in 1964 with the police revolver chambered in .38 Special, serial numbered 20xxx. In 1965, Korth introduced 4" and 6" barreled six-shot revolvers in .22LR and .22 Magnum, and five-shot models in .357 Magnum, serial numbered in the 21xxx series. The subsequent 22xxx/23xxx series appeared in 1967, comprising a small run of 6" revolvers in .357 Magnum and .38 Special, as well as .22LR, plus a few 4" .357 Magnums. Its new feature was a torsion trigger spring mounted on a stud accessible on the left-hand side of the frame, and fixed with a set screw on its right hand side. This arrangement allowed an easy adjustment of the trigger pull weight between 1kg (35.274 ozs) and 2.5kg (88.185 ozs) without disassembling the revolver.
    The 24xxx series, introduced in 1969, featured the definitively shaped Nill grips. The main innovation appeared in the trigger action, patented in Germany as DE 1904675 A1, and designed for a precise and tunable stacking transition in double action, achieved through the use of variously sized rollers on the trigger impinging upon the double action sear on the hammer. Thenceforth every revolver was shipped with five numbered metal wheels of different diameters that ranged from No.1 (0.283") for the hardest stacking transition to No.5 (0.293"), for no stacking at all. Korth also added the second cylinder lock, achieved by latching the head of the axially fixed ejector rod inside a lug located under the barrel. Because the head of the ejector rod was no longer accessible for manipulation with the cylinder latched, Korth added a pivoting lever at the right side of the hammer to cause the cylinder release. The floating firing pin with its spring was retained in the frame by a transverse pin. Finally, the exposed coil mainspring gave way to the definitive sleeved telescopic design inspired by the MP38 recoil spring.
    Korth’s next major innovation was the production of the second, Combat revolver variant, started in 1973 with the first 15 specimens numbered in the 27xxx and continuing in the 28xxx series. The Combat configuration differed from its Sport predecessors in four ways. First off, its wedge-shaped low profile ramp front sight was matched with a rear sight of a limited adjustment range inset into the frame, while the Sport wore a high profile front sight matched with a block-shaped adjustable rear Sport sight mounted on a self-sprung tang wedged into a cutout in the rear of the barrel. Secondly, its round butt grip frame replaced the square butt on the Sport revolvers, after the fashion of the grip frames of Colt’s M1877 Thunderer and Lightning contrasting with their M1873 Single Action Army predecessors. Thirdly, the centerfire cylinder capacity was upped from five to six rounds, with the accommodation of the extra round enabled by enlarging the 37mm cylinder by 1.5mm, while maintaining the original frame size. Lastly and most significantly, Korth initiated its transition from the one-piece barrel topped with a ventilated rib and fitted with a short locking underlug, reminiscent of Dean W. King’s patented 1936 custom conversions of S&W revolvers, to a two-piece assembly comprising a tensioned barrel surrounded by a shroud topped with a ventilated rib and fitted with a full-length underlug, in an arrangement that referenced Colt’s 1955 Python externally, while replicating Karl R. Lewis’patented 1967 design originally realized by Dan Wesson. Throughout their production, Combat barrels varied in length between 77mm and 82mm, nominally designated as 3". Meanwhile, the Sport revolvers retained their one-piece barrel fitting, with both five- and six-shot cylinders available through the 28xxx series.
    In the 29xxx series introduced in 1974, Korth co-branded his revolvers with Dynamit Nobel serving as a distribution partner. All revolvers in this series were fitted with six-shot cylinders. The 30xxx series completed the transition to the two-piece barrel construction across the model range, and introduced the optional 102mm or 4" Combat barrel configuration. Thenceforth, Korth revolvers featured three different sets of adjustable sights, the low profile Combat sights with a serrated ramp front sight and a rear sight adjustable for windage and elevation with set screws, and the click adjustable Sport and Target sights, the former requiring a screwdriver, and the latter featuring serrated wheels that can be turned by hand, without tools. Finally, the 1979 32xxx series introduced the definitive, semi-slabsided profile of the barrel shroud, and a speedloader relief cut in the recoil shield. All these features remained unchanged in the 1980 33xxx series, which for the first time added the 6" Combat configuration.
    Meanwhile, beginning in 1978, Willi Korth had refocused his design work on a new autopistol, considering the action of his revolvers fully perfected. Notwithstanding the first five prototypes produced in 1982 with features patented in Germany as DE 3111037 A1 and DE 3203991 A1, the manufacture of the first series did not start until 1989. The pistol never succeeded commercially, owing both to lack of development and the initial retail price of $6,750.00.


Korth revolver parts:
1. Frame
2. Barrel assembly
2.1 Barrel
2.2 Barrel shroud
2.3 Front sight •
2.4 Front sight retaining pin
2.5 Front sight Target Model •
2.6 Front sight retaining screw
2.7 Barrel shroud screw
3. Sideplate
4. Cylinder
5. Extractor
5.1 Extractor spring for rimless cartridges
6. Crane
7. Extractor axle
8. Cylinder retaining pin
9. Spring guide rod
10. Return spring for extractor
11. Extractor axle head
12. Spacer bushing
13. Cocking spring
14. Extractor axle guide bushing
15. Circlip for cylinder mount
16. Plunger for cylinder stop
17. Compression spring for cylinder stop
18. Retaining screw for #16 and #17
19. Crane locking piece
20. Compression spring for #19
21. Retaining nut for #9
22. Locking screw for trigger spring stud
23. Trigger spring stud
24. Trigger spring pawl
25. Trigger torsion spring
26. Trigger
27. Cylinder stop bolt
28. Pin for cylinder stop
29. Cylinder hand
30. Double action roller •
31. Guide pin for the hand and double action roller
32. V spring for the hand
33. Hammer cocking cam
34. Retaining pin for #33
35. Hammer complete with axle
36. Double action sear
37. Compression spring for #36
38. Retaining pin for #36
39. Pin for #40
40. Hammer strut
41. Bushing for hammer spring
42. Mainspring •
43. Mainspring guide housing
44. Cylinder release lever
45. Cylinder release lever plunger
46. Spring for #45
47. Firing pin
48. Firing pin return spring
49. Firing pin retainer pin
50. Rear sight tang for Model Sport
51. Rear sight blade for Model Sport
51.1 Rear sight blade for Model Combat
51.2 Adjustable sight blade for Model Combat
51.3 Retainer for elevation for Model Combat
51.4 Rear sight with blade for Model Target
51.5 Rear sight blades for Model Target •
51.6 Locking screw for sight blades
52. Elevation screw for Model Sport
52.1 Elevation screw for Model Combat
52.2 Elevation screw for Model Target
53. Compression spring for elevation
54. Steel ball for elevation
55. Snap ring for elevation screw
56. Windage adjusting screw for Model Sport
56.1 Windage adjusting screw for Model Combat
56.2 Windage adjusting screw for Model Target
57. Windage screw retaining pin for Model Sport
57.1 Windage screw retaining pin for Model Target
58. Leaf spring for rear sight
59. Cylinder locking plunger with retaining spring pin
60. Compression spring for cylinder locking bolt
61. Locking bolt for cylinder lock
62. Retaining pin with compression spring for #61
63. Trigger pivot screw
64. Sideplate screw
64.1 Fitted pin for side-plate
65. Lower retaining pin for grips
65.1 Single retaining pin for Match grip
65.2 Upper retaining pin for grips
66. Trigger stop screw
67. Grips
68. Grip screws (pair)
69. Grip screw bushings (pair)
70. Stop pin for hand lever spring

• Variable dimensions.

    Willi Korth’s revolvers were benchmade by five gunsmiths at the rate averaging about 120 pieces a year. In contrast to the mass production standards, Korth revolver parts were neither cast nor milled. They were ground in the course of hard fitting from steel forgings that boasted a tensile strength of 1,700 psi. Each revolver required 70 man-hours that comprised 600 distinct operations. Their major components were surface hardened up to 60 HRC on the Rockwell hardness scale. The original production of Korth revolvers ended in 1981 with the serial number series 33xxx, adding up to a total of 7141 revolvers in calibers .38 Special, .357 Magnum, 9mm Para, .22LR, and .22 Magnum, with barrel lengths ranging from 3" to 6", fitted with 6-shot rimfire and both 5- and 6-shot centerfire cylinders. The three main variants were the Combat, the Sport, and the Target models, some of which were finished as engraved luxury pieces.

    Korth turned over his business with all inventory, tools, and drawings to count Nikolas von Bernstorff on 30 June 1981. The company continued as Korth GmbH & Co. KG, its payroll peaking at 30 employees during the following decade. Its initial production comprised the 1982 transitional series 34xxx and 35xxx, still made under their inventor’s personal supervision, but marked “WAFFENFABRIK KORTH” rather than “WAFFENFABRIK W KORTH”. Following Korth’s resignation due to failing health in 1983, his successors produced the 36xxx, 37xxx, and 38xxx carbon steel series, mostly from the legacy parts fabricated and blanks forged by Willi Korth. Some newly manufactured major components such as barrel shrouds and cylinders were sourced from two subcontractors in Hamburg-Ahrensburg. The new owners also introduced the Fxxx matte-finished Profi series priced 25% below its luxurious siblings and added the optional 5¼" barrel configuration and .32 S&W Long chambering. Additionally, in 1985 there appeared the short-lived Sxxx matte stainless steel series, highly sought after by collectors today. Starting with the 36xxx series in 1986, the top strap of the Korth frame was made about 0.5mm thicker, adding around 9 grams to its weight. Additionally, the crane was modified with a new cylinder bushing, which eliminated the gas check relief cut of the original centerfire revolver design. These modifications strengthened the revolver and improved its cylinder support, at the cost of accelerating the erosion of the forcing cone. Lastly, the 9mm Para cylinder was milled to accommodate two extractor springs for rimless cartridges, bearing upon the flats of the extractor tube, to tension the extractor clockwise, forcing its blades into the extractor grooves of the rimless cartridge for more positive extraction.




1985 Korth 4" Profi Sport


    Willi Korth died on 10 October 1992, leaving the development of his autopistol unfinished, with its production by his successors falling short of the inventor’s design goals in accuracy and reliability alike. In mid-1999 Korth GmbH underwent bankruptcy following a long production slump. Its assets were taken over in April 2000 by the Armurerie Freylinger of Luxembourg. Over the following years, five gunmakers employed by Freylinger produced the 39xxx and 40xxx series, briefly expanding into the American market by establishing a subsidiary in the United States in 2001 in a joint venture with Earl Sheehan, an independent importer of Walther firearms. In 2001, they introduced the finish option of plasma TiAlN PVD surface coating in satin and matte styles, which boasted exceptional abrasion resistance. Since 2002, Korth revolver aficionados benefited from their comprehensive historical and technical analysis by Veit Morgenroth, arguably the most detailed investigation of a sporting firearm ever to be published. Regrettably, this treatise neglected the contributions of Korth’s successors, which included the Triple Lock in the T-prefix serial number sequence, the externally tensioned mainspring, and switch-barrel configurations developed under the management of von Bernstorff.
    In November 2008 the original Korth factory in Ratzeburg closed its doors. But six months later, on 22 April 2009, Andreas Weber and Martin Rothmann revived the Korth trademark in Lollar near Giessen. The new owners of Korth exhibited their 41xxx revolver series and autopistol prototypes in 2012 and 2013, both at IWA in Nürnberg and the SHOT Show in Las Vegas. In the sequel, I shall examine some representative Combat and Sport revolvers manufactured by Willi Korth and his successors.

Crossposted to [info]larvatus and [info]guns.

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