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
139 Reviews
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Gearbox
Easy to install and helped my long range accuracy. Well worth the money
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Well worth it!
This is the best upgrade I have made to my BuckMark! My gun now shoots better than ever! I cannot say enough good things about it. Everyone who owns a BuckMark should upgrade to the GearBox. It's easy to install and it makes a world of difference.
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Great Customer Service!
The first gearbox I ordered installed easily but failed to consistently engage the sear. When I reached out to Tandemkross they responded immediately and rushed me a replacement gearbox at no charge which worked flawlessly once installed. It reduced my trigger pull by about 1lbs and noticeably improved the already great Buckmark trigger.
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The Gearbox
The gearbox worked wonders for my wife's gun. The neibor also noticed a big difference and I tell them before hitting the range of the modification m as ke to the gun. I love the motto, Good guns made Great
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The Best Buckmark Upgrade
Only the best thing to happen for the Buckmark... EVER. If you've tried the Hegis flip, you know what a pain the sear spring is. And the Hegis flip isn't guaranteed to work. I've done a couple. It worked on one, didn't on another. So when I saw the gearbox I bought one and installed it for a friend. Simple, EASY, and very effective. My buddy just raves about his trigger now! That and a TK Trigger and you get the best Buckmark trigger, period. If you own a Buckmark , you NEED a "Gearbox"
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Mr.
I ordered 2 for both of my Buckmarks. Delivery was fast, install was idiot proof. On the first pistol, the trigger when from 5 to 3 lbs. 100% reliable over the 1000 or so rounds since install. On the second pistol, the trigger was already light, about 3.5-4 lbs and the force dropped to about 2 lbs. It did not reset the trigger. I swapped with the other gearbox, the problem stayed with the pistol, so I don't think it was an issue with the quality of the part or install, but a variation of the pistol from Browning. Nevertheless, its a solid product and I will keep the 2nd as a spare.
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Buckmark gearbox
Wow what a cool idea !! and long in coming, if you are some one who already knows how to field strip your buckmark, installing the gearbox is fast simple and painless. Moreover my trigger pull went from +4 to 2 3/4 pound very predicable and consist no other trigger work ( except lube ) . Highly recommend .
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Great product
Reduced trigger pull to a more reasonable weight. Would have liked a little less trigger pull, but this is still a great product.
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BDG
Much easier install than factory spring. Did not notice any reduction in trigger pull weight.
