$29.99
15 in stock
Online inventory may differ from in-store availability.
Quick turnaround so you get your gear sooner.
Trusted checkout with industry-standard protection.
Keeping Traditions Alive Since 1953
Secure Transactions provided with 
If you own a Buck Mark, the GearBox is one of those rare upgrades that actually makes a noticeable difference without turning installation into a weekend project. The factory trigger on the Buck Mark is plenty good to start with, but plenty of owners want something crisper and lighter for target work or competition.
Here's where most people run into trouble. There are DIY spring flip tricks floating around online, and they sound simple enough until you're staring at tiny springs and wondering if you have it right. The Tandemkross GearBox eliminates that guesswork entirely. It's a straight drop-in replacement for the factory sear spring, and it comes housed in a polymer installation frame that keeps everything captured and aligned during the swap. That frame stays in the gun once installed, acting as a guide for the spring to ensure consistent engagement every single time.
You're looking at a trigger pull reduction of at least half a pound, and plenty of owners report pulls dropping from the mid-4-pound factory setting down to the 2 to 2.5-pound range depending on how your gun was set up and what else you have going on inside. The spring itself is redesigned with better tension characteristics than the factory piece, which directly translates to a cleaner break without mushiness.
The install itself is refreshingly straightforward. Drop the slide, punch out the sear pin, swap the old spring for the GearBox assembly, and you're done. Even if you're not a gunsmith, the process takes maybe 15 minutes, and Tandemkross has solid installation videos on their site that walk you through it step by step. Once it's in, the frame works invisibly to guide the spring, which means you get consistent results shot to shot with none of that unpredictability that sometimes comes with a botched DIY approach.
Yes, significantly. The polymer frame captures and guides the spring so you don't have to fiddle with tiny components or worry about whether you have the tension right. With the factory spring, flipping it requires getting everything perfectly aligned, and if you mess it up you can end up with dangerous inconsistency in your fire control. The GearBox takes the guesswork out entirely and usually takes about 15 minutes with basic tools.
You'll see at least a half-pound reduction across the board, with most owners reporting pulls that drop from the mid-4-pound factory baseline down to somewhere between 2 and 2.5 pounds. Individual results vary depending on your specific gun's setup and parts, but the consensus is that it delivers a noticeably crisper, lighter break.
The GearBox is designed to fit all standard Browning Buck Mark models, including the Lite, Hunter, Camper, and Target variants. If you have a Buck Mark variant with a standard fire control group, this will work. Verify your specific model just to be safe, but the vast majority of Buck Marks use the same sear spring interface.
No, it's a standalone upgrade. The GearBox is a pure drop-in replacement for the factory sear spring assembly. That said, many owners pair it with the Tandemkross Victory Trigger for even better results, but that's optional and not required for the GearBox to work great on its own.
| UPC | 769498483640 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | TK12N0317BLK1 |
| Model |
You must be logged in to post a review.
Reviews
There are no reviews yet.