Frankenstein Armory
Frankenstein Armory TSB-Lite
Drop-in adapter that lets a locking-bar forced reset trigger run in the standard-caliber SIG MCX and MPX family. Not compatible with a Super Safety.
Quick Specs
- Price
- $100
- Weight
- N/A
- Brand
- Frankenstein Armory
- Category
- accessory
Features
- •TSB adapter for locking-bar-style FRT triggers
- •17-4PH stainless steel, heat treated to condition H900
- •Drop-in install, two coil pins included, no cutting
- •Fits MPX, Copperhead K, Virtus, Rattler, Spear LT, Rattler LT
Compatibility Tags
Overview
The Frankenstein Armory TSB-Lite is the part that lets you run an actual forced reset trigger, not a selector, in a standard-caliber SIG MCX or MPX. It is the counterpart to the AS Designs slip trip: where the AS Designs kit adapts a forced-reset selector such as a Super Safety or Arc-Fire to the gun, the TSB adapts a locking-bar-style FRT trigger to it. The MCX and MPX carrier does not present the reset trip surface an AR fire control group rides against, so the TSB supplies the surface the trigger's locking bar works against.
It is machined from 17-4PH stainless steel heat treated to the H900 condition, then tumbled to a uniform finish. Installation is drop-in: two quarter-inch stainless coil pins ship in the kit and no cutting is required. You supply the locking-bar FRT trigger separately.
Fitment covers the SIG MPX, Copperhead K, Virtus, Rattler, Spear LT, and Rattler LT. It is explicitly not compatible with a Super Safety, so this is the block you choose when you want an FRT trigger rather than a forced-reset selector. Confirm your model and current state law before ordering; Frankenstein Armory sells the TSB direct, and all sales are final.
Key Features
- Runs a locking-bar forced reset trigger in the standard-caliber MCX and MPX family
- 17-4PH stainless steel, heat treated to condition H900
- Drop-in install, two coil pins included, no cutting
- Fits MPX, Copperhead K, Virtus, Rattler, Spear LT, Rattler LT
- The FRT-trigger alternative to a forced-reset selector
Pros
- +Runs an actual FRT trigger in the MCX and MPX, not just a forced-reset selector
- +Drop-in with included pins, no cutting or permanent modification
- +17-4PH H900 stainless for strength and wear resistance
- +Broad fitment across the MPX and the MCX Rattler, Virtus, and Spear LT family
Cons
- −Requires a separately purchased locking-bar FRT trigger; it does nothing on its own
- −Not compatible with a Super Safety; this is the FRT-trigger path only
- −Sold direct only, all sales final, no returns
- −Does not cover the heavy-caliber Spear in .308 or .277; that needs the TSB-Heavy
Detailed Specifications
- Material
- 17-4PH stainless steel, heat treated to condition H900, tumbled finish
- contents
- TSB and two quarter-inch stainless steel coil pins
- compatibility
- SIG MPX, Copperhead K, Virtus, Rattler, Spear LT, Rattler LT
- requires
- A locking-bar-style forced reset trigger (sold separately)
- fitmentNotes
- Not compatible with a Super Safety; drop-in with included pins, no cutting required
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Build Your Custom Configuration
Add the Frankenstein Armory TSB-Lite to your build and see how it enhances your platform.