Man Kung MK-XB21-TR trigger assembly - Outlet

Man Kung MK-XB21-TR Replacement Trigger Assembly with Weaver Rail, Black Metal

This trigger box is the very heart of your crossbow. The attached photos clearly show a bullpup-style design, where the actual trigger shoe is positioned further forward using a robust steel linkage bar. This clever engineering allows the crossbow to maintain compact dimensions whilst preserving a sufficiently long power stroke. The mechanism is fitted with a very clear fire selector: a red dot with an "F" (Fire) and a white dot with an "S" (Safe). An optics mounting rail with transverse slots is firmly fixed to the top of the entire block, ensuring that your sight remains perfectly zeroed even after hundreds of shots.

Installing this mechanism requires care and at least basic technical skills. It drops into the rear section of the crossbow stock, where it is secured using precisely aligned mounting holes and retaining pins. When replacing it, always ensure that the trigger linkage moves freely and that the string latch aligns perfectly with the crossbow's flight track. If you are unsure about the installation, I highly recommend having an experienced bow technician carry out the replacement, as your safety depends on its correct fitment.

Technical Specifications

Interesting Facts from the World of Crossbows

Did you know that the most crucial revolution in modern crossbow safety was the invention of the ADF (Anti-Dry Fire) system? This small but incredibly important mechanism, which this model is equipped with, prevents you from disengaging the safety and pulling the trigger if there is no bolt resting in the flight groove. A dry fire (shooting without an arrow) releases an enormous amount of energy that has nowhere to go, and in the vast majority of cases, it leads to an immediate snapped string or even the fatal destruction of the crossbow limbs. The system inside this block mechanically locks the string latch until the shaft of a bolt depresses the safety catch inside the mechanism.

Care and Maintenance

To ensure this metal Man Kung trigger mechanism serves you flawlessly for as long as possible, it requires some basic care. I recommend lightly lubricating the internal moving parts, especially the string latch and the linkage pins, from time to time (for example, after 100 shots or at the end of the season) with a suitable gun oil or Teflon lubricant. A really tiny drop is all that is needed. Keep the top mounting rail clean and dry so that your optics mount sits firmly. If you get caught in the rain with your crossbow, wipe the mechanism dry once you get home to prevent surface corrosion of the steel pins.

What You Must Avoid

• Never attempt to dismantle the mechanism. The internal springs are under high tension, and amateur disassembly could lead to the loss of tiny components and completely ruin the entire unit.
• Avoid using brute force. If the crossbow will not engage or disengage the safety, never force the lever. The string is likely not fully cocked into the rear-most position.
• Do not use harsh solvents when cleaning, as this could damage the coloured safety markings and break down the structure of the factory lubricant inside the block.
• Do not leave the crossbow cocked for prolonged periods. This puts extreme stress not only on the limbs but also on the string latch within the mechanism itself.

Recommended Accessories

To make your shooting experience complete, I suggest you consider purchasing the following equipment, which will form a perfect functional set with your crossbow:

• A high-quality Red Dot or Rifle Scope: Thanks to the 22 mm Weaver rail on this mechanism, you can easily equip your crossbow with optics for accurate shooting at longer distances.
• Premium String Wax: An absolute necessity to prolong the life of your string, which rubs directly against the catch in this mechanism.
• Spare Carbon Crossbow Bolts: Arrows of the correct length and weight are vital for the proper function of the ADF safety within this trigger block.
• Padded Crossbow Case: Secure storage will protect your sensitive optics and the delicate trigger mechanics from dust and impacts during transport.