S&W K Frame Model 19-4 Strain Screw, Old Style, Round Butt - Part# 19172

Smith & Wesson K Frame Model 19-4 Strain Screw - Part 19172

Authentic Smith & Wesson old-style strain screw for K Frame Model 19-4 Combat Magnum revolvers with round butt grip frames. This vintage OEM factory part controls mainspring tension, directly affecting trigger pull weight and hammer function for reliable performance.

Key Features

• Vintage OEM Part: Genuine Smith & Wesson factory component manufactured to exact specifications
• Old-Style Design: Period-correct strain screw for classic Model 19-4 revolvers
• Mainspring Tension Control: Regulates hammer spring pressure for consistent trigger pull and reliable ignition
• Round Butt Configuration: Specifically designed for round butt grip frames
• Used Condition: Functional vintage part showing normal wear consistent with previous use

Compatible Models

This strain screw is designed specifically for Smith & Wesson K Frame revolvers with round butt grip frames:

K Frame Models (Round Butt, Old Style):

• Model 19 Combat Magnum - .357 Magnum (round butt variants)
• Model 19-2, 19-3, 19-4 - .357 Magnum (round butt variants)
• Model 66 Combat Magnum - .357 Magnum (round butt variants)
• Model 13, 65, 67 - .357 Magnum / .38 Special (round butt variants)
• Other vintage K Frame models with round butt configuration requiring old-style strain screws

Historical Context: The Model 19 Combat Magnum was introduced in 1955 at the request of legendary lawman Bill Jordan. Built on the medium K Frame, it offered .357 Magnum power in a lighter, more compact package than the N Frame Model 27.

Note: This is an old-style strain screw for round butt models only. Not compatible with square butt models or newer production runs using updated strain screw designs. Verify your revolver's grip frame configuration and production era before ordering.

Installation

Professional gunsmith installation strongly recommended. Disassembly and reassembly of the revolver's internal action required. Some fitting may be necessary by a qualified gunsmith to ensure proper mainspring tension and trigger function.

Specifications

• Part Number: 19172
• Manufacturer: Smith & Wesson
• Condition: Used
• Frame Type: K Frame
• Grip Frame Type: Round Butt
• Style: Old Style (Vintage)
• Compatible Caliber: .357 Magnum
• Weight: 1 oz

Preserve the authenticity of your vintage Smith & Wesson K Frame revolver with genuine OEM parts.

Questions? Contact us at sales@usagunsandgear.com or call 770-544-8075 for technical support and compatibility verification.