How Trigger Assisted
Reset Works
A technical breakdown of TAR mechanics, design philosophy, and what separates them from standard trigger groups — from the engineers who build them.
Complete Technical Overview
A full breakdown of TAR mechanics, cycle sequence, and engineering design — everything you need to understand how these systems work.
How the Reset Actually Works
In a standard semi-automatic trigger group, the shooter must release the trigger manually to allow it to reset before the next shot. In a TAR system, the bolt carrier group mechanically forces the trigger forward into its reset position—even if the shooter hasn't released it.
The result is a faster, more consistent reset. One controlled function still occurs per round fired—the firearm remains semi-automatic in its fundamental operation.
Step-by-Step: How It Cycles
Every round follows the same five-step sequence — mechanical, repeatable, and by design semi-automatic.
The shooter presses the trigger. The sear releases the hammer, which strikes the firing pin and ignites the round.
Propellant gas drives the bolt carrier group rearward. As it travels, it contacts the TAR trip component — the critical difference from a standard trigger.
The BCG's rearward travel forces the trigger forward into its reset position — even if the shooter hasn't released the trigger. This is the defining action of a TAR system.
The recoil spring drives the BCG forward, chambering the next round and resetting the hammer to the cocked position.
The firearm is ready for the next shot. The trigger must be pressed again to fire — one function, one round. Semi-automatic by design.
What You Get
Every design decision in a Dumpy Defense TAR system traces back to measurable performance. Here's what sets it apart from a standard trigger group.
BCG-assisted reset means the trigger is ready for the next shot more quickly than any standard trigger group allows.
Mechanical reset is highly repeatable from shot to shot — reducing variation in trigger feel even during sustained rapid fire.
The accelerated, consistent reset enables faster and more controlled follow-up shots compared to any standard trigger group.
TAR systems produce one function per trigger pull. The firearm remains semi-automatic — this is not a selective-fire modification.
Engineered for the precise fire-control geometry of each host — AR, AK, Glock, 10/22, TX22, MP5, and more. Not a universal fit.
Most Dumpy Defense TAR systems are true drop-in units. No permanent modification to your firearm. Reversible if needed.
Engineering Over Marketing
Dumpy Defense builds TAR systems with a focus on material selection, dimensional accuracy, and real-world function. We document what our products are made of, what they're compatible with, and how to install them.
Legal Responsibility
It is the sole responsibility of the purchaser to research and understand all applicable federal, state, and local laws prior to purchasing, possessing, or using any TAR system. Laws vary by jurisdiction. Dumpy Defense does not provide legal advice. If you have questions about legality in your area, consult a qualified attorney before purchasing.
Find Your Platform
TAR systems for AR, AK, Glock, MP5, 10/22, TX22, and more. CNC-machined in Texas.