Description
The AR-15 Semi-Auto Trigger from Luth-AR is the standard single-stage fire control piece that keeps a mil-spec AR running the way it should. This is the trigger you reach for when you're building a lower from a bare parts kit, refreshing an old rifle, or replacing a piece that has seen a lot of range time. It fits standard AR-15 lowers and works alongside a matching hammer, disconnector, and pins to make up a complete fire control group.
What Sets the Luth-AR LR-20 Trigger Apart
Luth-AR builds their parts to actual mil-spec drawings, materials, and heat treat, so this trigger drops in and functions like the original equipment on a factory AR. It carries the same familiar curved bow and pull character that most AR owners already know, which means no surprises in feel and no fussing with fitment. Luth-AR has deep roots in the AR world going back to the DPMS days, and that experience shows up in how consistently these small parts perform.
Installing the Luth-AR AR-15 Trigger
Swapping a trigger is one of the more approachable AR projects. If you're comfortable with a punch set and know your way around a lower receiver, you can handle it at the bench in a few minutes. If you'd rather not tackle it yourself, any gunsmith can install it quickly. Keep in mind this is the trigger component itself, so you'll want a hammer, disconnector, springs, and pins on hand if you're starting from scratch rather than replacing a single worn piece.
Who Reaches for This Trigger
This one makes the most sense for folks who want reliable, no-frills function rather than a tuned competition break. It's a smart pick for a first build, a spare parts drawer, or a truck gun where dependability matters more than a featherweight pull. For the money, it's tough to beat a mil-spec trigger from a name that has been in the AR business for decades.
Key Specifications
- Manufacturer: Luth-AR
- MPN: LR-20
- UPC: 859819007485
- Style: Semi-Auto
- Trigger Type: Single-Stage
- Material: Steel
- Finish: Black
- Platform: AR-15
- Specification: Made to Mil-Spec drawings and heat treat
- Country of Origin: USA
What’s Included
- Luth-AR AR-15 semi-auto trigger (LR-20)
Frequently Asked Questions
Is the Luth-AR AR-15 semi-auto trigger a complete drop-in unit?
No, this is the standard trigger component itself, not a self-contained drop-in cassette. To make a full fire control group you'll also need a hammer, disconnector, springs, and trigger and hammer pins. If you're replacing a single worn trigger in an otherwise complete lower, this is exactly the part you want.
Will this Luth-AR trigger fit my AR-15?
It's built to mil-spec drawings and dimensions, so it fits standard AR-15 lower receivers. Since Luth-AR machines these to military specifications, fitment and function match what you'd expect from factory original equipment. If your lower accepts standard mil-spec fire control parts, this trigger will work.
What kind of trigger pull does the LR-20 have?
This is a single-stage trigger with the familiar curved bow and pull weight you'll find on a typical mil-spec AR-15. It's designed for reliable, consistent function rather than a lightened competition-style break. That makes it a solid choice for general use, builds, and duty-style rifles.
Can I install this trigger myself?
Yes, a trigger swap is one of the easier AR-15 jobs if you have a punch set and a little patience. Plenty of home builders handle it at the bench without issue. If you'd prefer, any gunsmith can install it in just a few minutes.




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