PIONEER GUN WORKS INC.
Old World Craftsmanship ~ New World Technology
Main Spring Conversion
Coil Main Spring Conversion for Uberti made Model 73 & 66 Rifles!
(Patent Pending)
Although our coil mainspring conversion has been a huge success, we've been testing new materials for this kit for a year, and have made an improvement that is now available. We're now making the coil mainspring conversion kit from 6061 aluminum and anodizing it for corrosion protection. This makes the moving parts in this conversion kit lighter, resulting in more energy transfer to the firing pin and faster lock times, which result in more reliable firing and faster follow-up shots.
Strut Assembly, 2 Coil Main Springs, & Mounting Base
Assembled Coil Main Spring Conversion
The Coil Main Spring Conversion consists of a strut assembly, 2 coil main springs, adjusting shims, two 6-4- set crews, and a mounting base. It replaces the stiff, flat main spring that comes in these rifles.
Coil Main Spring Conversion with the hammer in the cocked position.
Coil Main Spring Conversion with the hammer in the forward (firing) position.
In the two pictures above, notice how the strut is free to move up and down on the hammer as the hammer rotates forward and back. This movement allows the hammer's leverage to adjust as needed when the spring is being compressed. The result is that the hammer pull is the same when the coil spring is compressed as when it is extended. This greatly reduces the "stacking" that is felt after installing a short stroke kit.
As the hammer is being forced forward during the firing stroke, the strut moves upward on the hammer, giving the leverage advantage to the spring. The result is that the spring is able to give the hammer a more forceful "slap" as it hits the firing pin extension, giving you a harder hit on the primer than a lightened flat spring can provide.
The ball bearings at both ends of the strut provide a smooth as silk feel to the cocking action of the rifle too.
Installation
Installation of the Coil Main Spring Conversion is simple. After removing the lower tang assembly from the rifle's receiver, remove the flat spring and hammer from the lower tang assembly. Remove the "T" strut from the hammer, polish the inner curve on the back of the hammer, and replace the hammer in the lower tang assembly. Install the Coil Main Spring Conversion in place of the flat spring, and re-install the lower tang assembly into the receiver.
Next, use a Dremil tool with a small sanding drum to remove enough wood from the bottom slot in the stock to allow sufficient clearance for the Coil Main Spring Conversion. That's it!
Illustrated installation instructions will be supplied with each conversion kit .
Next, use a Dremil tool with a small sanding drum to remove enough wood from the bottom slot in the stock to allow sufficient clearance for the Coil Main Spring Conversion. That's it!
Illustrated installation instructions will be supplied with each conversion kit .
Price
$150.00
$150.00
These assemblies are now in stock and ready for immediate delivery.
