"GearBox" Installation Instructions for the Browning Buck Mark
At a glance:
- Upgraded sear spring lowers trigger pull weight by .5lbs or more!*
- Installation frame houses spring for easy installation and consistent sear engagement
- No need to experiment with DIY spring fixes - one simple drop-in replacement!
The Browning Buck Mark has a great trigger right out of the box. But if you’re like many Browning Buck Mark owners, you’ve likely researched ways to lower the gun’s trigger pull weight and adjust the feel even further.
There are many DIY solutions out there, including the well-known “Heggis Flip” or Buck Mark sear spring flip. But these solutions can be complicated to perform, provide inconsistent results and can cause potentially dangerous issues with the fire control system.
Put an end to DIY fixes with the new “GearBox” for Browning Buck Mark from TANDEMKROSS! The “GearBox” is a simple, drop-in replacement for the factory Buck Mark sear spring that makes installation easier and lightens the trigger pull weight.
The “GearBox” comes complete with a redesigned torsion spring housed in a polymer installation frame. The frame captures the spring for easy installation and then, once installed, works as a guide for the spring, ensuring proper alignment and consistent engagement with the sear.
Simplify your trigger upgrades and install the TANDEMKROSS “GearBox” today. Pair with a Browning Buck Mark “Victory” Trigger for ultimate performance!
*Individual trigger pull weight results may vary.
*Fits all Buck Mark models including the Buck Mark Rifle
137 Reviews
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Buckmark gearbox
The gearbox works perfectly and is a simple installation. It lowered trigger pull to 2.0 lbs on a gun with the best factory triggerI have ever used. would not hesitate recommending it to anyone
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GearBox for BuckMark
Nicely lightens up trigger for a seamless pull
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Easy to install!
Hard to say exactly how much it reduced the trigger pull, but it was really easy to install. Their video is so well done it’s like their pistol is right in front of you as you are changing it out. Great job.
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Gear Box review
Answered an ad for a near new Buckmark at a price I couldn't refuse. Trigger was worst of the five Buckmarks in the family. Did the spring flip but trigger reset was not reliable. Dropped in the Gear Box, problem solved. Great trigger. Gear Box so simple to install.
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Buck Mark "gearbox" Sear Spring
I installed this sear spring GEARBOX in my Buck Mark in conjunction with the Victory trigger. The measured trigger pull weight before the upgrade was 3 3/4-4 pounds. The measured trigger pull weight after the upgrade is 2-2 1/8 pounds. I am impressed and very pleased with the results.
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Gear Box
Easy to install, and makes a big difference.
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Gear box
WOW what a huge difference!! Installation is simple with the help of the great video. I complemented the gear box with the victory trigger for the ultimate in trigger pull and feel!
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Best accessory ever purchased
As a non-gunsmith I was amazed when I found how easy this was to install. I can do legos eight he best of them and that’s exactly what this is. When completed, this brought my trigger pull to 2.5 lbs +/- .1. Just wow. I never thought I could have a trigger that good by spending a few bucks and 10 minutes. TK made a gem!
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Gearbox
This is one of those rare instances where a product works exactly as described. I watch the video on how to install this, and it was 100% accurate. It went in easily, worked just as advertised, and has lightened my trigger pull. This is a great product!
