ALG Defense Advanced Combat AR 15 Trigger (ACT)


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Upgrade your AR 15 trigger without spending a fortune – the ALG Advanced Combat Trigger features Hard Lubed components and polished sear surfaces.

The pull of the ACT is very similar to a standard mil-spec trigger, however it is sharper and the grittiness of the stock trigger pull has been removed while the traditional reliability of a stock trigger remains.This is accomplished by polishing the sear surfaces smooth and hard-lubing the trigger components.

Performance Advantages for the Shooter

  • The ALG Defense ACT trigger pull is smoother and sharper than a stock trigger. This is accomplished by polishing the sear surfaces smooth and HardLubing** the trigger components.
  • Sear geometry has not been changed from the standard profile so the high reliability that the stock trigger is known for is unchanged.Geissele
  • Trigger and hammer are made from true 8620 alloy steel military specification castings, correctly carburized, quenched and tempered for high surface hardness.
  • Disconnector is 1070 High Carbon steel properly Austempered into the spring range of hardness.
  • Springs are corrosion resistant and meet military specifications.
  • A full force hammer spring is used for positive ignition of all type of ammunition.
  • Trigger and hammer pins are improved over stock mild steel by using 4140 Chrome-Moly steel that has been quenched and tempered. Pins are centerless ground to a fine finish and a diameter 0.001” larger than stock to reduce play in the trigger assembly while retaining a slip fit into the weapon lower receiver. Both pins are Nickel-Teflon coated.
  • Pull weight is above the U.S. Military minimum pull weight of 5.5lbs but does not reach near the upper limit of 9.5lbs. Generally, the pull weight is about 6.0lbs.

Advantages for the Armorer

  • The ALG Defense ACT trigger is an enhanced standard trigger so maintenance and installation procedures are unchanged.
  • Trigger assembly parts may be interchanged between triggers, there are no matched sets.
  • As a trigger meeting the essential U.S. Military trigger specifications for the M4 Carbine, the ALG Defense ACT can be substituted for lower performing stock triggers while still staying in compliance with Unit or Departmental requirements.

**Note on Hard Lubing:

HardLubing is ALG’s term for electroless Nickel plating with an integral modifier to the base nickel plate. Either Boron or Teflon is used to enhance surface hardness, wear resistance and corrosion resistance and also create favorable tribological properties of the trigger components.

Testing has shown that differential coating of the trigger parts contributes to the sharpness of the ACT’s single stage pull. The trigger component is plated with Nickel-Boron which has a high surface hardness combined with excellent wear resistance. The color is a pleasing matte light grey that may be painted on non-functional surfaces if the shooter so desires (such as the trigger bow that is visible outside the lower receiver).

The hammer, disconnector and trigger/hammer pins are plated with Nickel-Teflon which combines a low coefficient of friction with good wear resistance. The Teflon impregnation colors the metal a mottled, greyish/green. Parts coated with Nickel-Teflon cannot be painted. Both coatings are highly corrosion resistant eliminating the oil seal of traditional phosphated firearm components.

Have Questions About this Product?

The AT3 Tactical store has a 90 day no-hassle return policy for products in good condition. You can view the full details of our return policy here.

If you encounter an issue or defect with a product after 90 days of your purchase, you can refer to the manufacturer for a warranty claim. Their policies are below.

ALG Defense Lifetime Warranty

  • ALG Defense warrants its firearms, components, and tools against defects in materials and workmanship during the lifetime of the product.
  • ALG Defense does not warrant against normal wear and tear, items consumed or expended by their normal use (including springs, pins, etc.), product misuse (including criminal misuse, negligence or use under the influence of drugs or alcohol), accidental damage, or damage caused by improper handling, unapproved modifications to the product, defective or improper ammunition, or corrosion.
  • Defective accessories (e.g., scopes, suppressors, flash hiders, sights, slings, parts with glass or electronic components, etc.) may be warranted by their original manufacturers but are not covered by this warranty.
  • If you submit a valid claim under this Limited Lifetime Warranty, ALG Defense will authorize your return of the product and, at its sole discretion, will:
  1. Repair the product, including replacement of defective parts with new or refurbished parts
  2. Replace the product with a product of equal or greater value.
  • If ALG Defense decides to replace a product under this warranty, ALG Defense will keep the product being replaced.
  • You must satisfy all terms and restrictions set forth in this Limited Lifetime Warranty and obtain a Return Material Authorization before shipping any product to ALG Defense.
  • Before shipping any product to ALG Defense, please ensure that the following:
  1. The product has not been modified, is clean and any accessories have been removed (unless otherwise instructed by an ALG Defense technical support agent)
  2. There is no ammunition in any product or packaging
  3. The completed Return Material Authorization form has been placed inside the packaging
  4. The Return Material Authorization number has been clearly written on the outside of the packaging.
  • Any failure to follow these instructions could result in your package being refused and returned to you without repairs at your expense.

Contact Details:

Telephone: 610-635-8937.

Disclaimer: Manufacturer’s warranty is subject to change without prior notice.

Customer Reviews

Based on 10 reviews
David Phelps
Big improvement

I hadn't fired my Bushmaster XM-15 for quite a while and forgot how bad the stock trigger was. Over the past two years I acquired a PSA AR-15 and an AR-10, both of which have noticeably good triggers. About 3 weeks ago I fired the Bushmaster and was taken aback by how gritty the trigger was. Shortly afterwards I ordered an ALG replacement unit. About 3 days after I placed the order it arrived. I had never removed anything from an AR lower so I was a bit apprehensive but after watching a good YouTube video I tore into it. The kit comes with a slave which I thought was a simple and excellent thing to include. The new trigger parts went in easily. I used the 4.5# spring. I noticed a huge difference on the first test pull. Crisp and no grit. I can't wait to take it back to the range.

Thanks for sharing your feedback! We're glad you're satisfied with your purchase.

Gary West

The trigger is way better than the original, glad I bought it!!!


Smooth trigger. This is my second one. I will be buying another soon.

Thank you for your review! We're glad to hear that you're satisfied with the smooth performance of our ACT trigger. We appreciate your continued support and look forward to serving you again in the future. Happy shooting!

Jeffrey Klee
ALG Quality

For the money this trigger works well no problems I have a few of them

Thank you for your review. We are glad to hear that you are happy with the ALG Defense Advanced Combat AR 15 Trigger (ACT).

Jeff Guerrero
Awesome Trigger

This trigger is the best i've trigger i've used so far, that I ordered another one.

Thank you for your feedback! We're glad to hear that you're pleased with the trigger - it's been a popular choice among our customers.