Details
Details
The ALG Defense Quality Mil-Spec (QMS) Trigger is a precision-engineered upgrade for AR-15 platforms, designed for shooters who value traditional mil-spec performance with smoother operation and enhanced reliability. Built to meet U.S. military specifications, the QMS maintains a pull weight above 5.5 lbs, eliminating the grittiness of standard triggers while preserving their legendary dependability. Ideal for duty rifles, armorer builds, or any application requiring mil-spec compliance, this drop-in AR trigger upgrade delivers improved performance without sacrificing regulatory compatibility.
Features:
- Smooth, consistent pull with improved sear surface finish
- Maintains standard sear geometry for maximum reliability
- Constructed from military-spec 8620 alloy steel and 1070 high-carbon steel
- Trigger and hammer pins made from durable 4140 chrome-moly steel
- Pull weight approximately 6.5 lbs, compliant with M4/M16 military standards
- Compatible with standard installation procedures and spare parts
- Corrosion-resistant springs and full-force hammer spring for reliable ignition
- Pins are precision-ground 0.001" over standard to reduce play
- No matched sets—parts are interchangeable for easier maintenance
- Assembled in the USA
Specifications
California Prop 65 warning
WARNING: This product can expose you to chemicals, which are known to the State of California to cause Cancer and Reproductive Harm. For more information go to www.P65Warnings.ca.gov.Ratings & Reviews
60 reviews
Nice trigger
by Chris L
This is a nice trigger, breaks clean with very little creep. Basically a standard mil spec trigger but with consistent quality. This with some jp springs makes for a great 4lb trigger for around $50.
Nice
by sam smith
The qms trigger is exactly what it claims to be. A "Quality milspec trigger.
Very Good No Complains
by Matt
The pull is very smooth - perfect for a no-nonsense build
great place to buy
by fast eddie
Recently purchased an alg trigger and this place was greatNice and friendly staff I recommend this place trigger went on easy an functioned great
Very good trigger
by joseph brugette
Probably the best trigger for the money.
Another great experience
by Mike D
Primary Arms has always impressed me with quick shipping and good prices. The trigger was just what I needed to replace my horrid factory unit without paying for a competition trigger. Very happy!
ALG Defense Trigger - 05198QMS
by Randy Sergent
Primary Arms delivered my product fast. No surprise or delays. ALG Defense Trigger installed with no issues. I have not had a chance to take to the range for full test. Quality appears to be very good. I would buy these triggers again from Primary Arms.
excellent product.
by xm w
perfect fit, smooth.
Great quality for the price
by Craig McClain
Needed a trigger for a 300 Blackout build and this one feels really good.
Solid upgraded Mil Spec Trigger - Fast delivery
by Krav Dude
Much better battle trigger than a standard Mil Spec Trigger. Clean and Crisp letoff. No grit or creep that you find with standard triggers. A must for those that are used to rifle triggers that have been worked on. Great value for the price and great service from PA