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Questions & Answers
What is the difference between the QMS and ACT trigger? Expert Answer

The QMS trigger features polished surfaces on a standard mil-spec trigger, the ACT takes it a step further by also being nickel plated with either Boron or Teflon used to enhance surface hardness.

by Jonathan D., Gear Expert, September 7, 2018
Customer Reviews
Helpful Negative Review
It was good kinda by Jon, August 13, 2016
Everything about this kit was solid with one exception, the mag catch was out of spec. I inserted mags and it would either not lock them in or if I could somehow get it in the mag release button was stuck and wouldn't depress. It was an easy fix I ju...
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Product Info for ALG Defense AR15-M4 Mil-Spec Lower Parts Kits

This kit 16-001 comes with: Bolt Catch, Bolt Catch Plunger, Bolt Catch Spring, Bolt Catch Roll Pin, Mag Release, Mag Release Button, Mag Release Spring, Buffer Retainer Spring, Safety, Buffer Retainer, Safety Detent Spring, Safety Detent, Trigger Guard, Trigger Guard Roll Pin, Takedown Detent Springs,Takedown Detents,Takedown Pins, QMS Triggerimage

This kit 16-002 comes with: Grip, Grip Screw Washer, Grip Screw, Bolt Catch, Bolt Catch Plunger, Bolt Catch Spring, Bolt Catch Roll Pin, Mag Release, Mag Release Button, Mag Release Spring, Buffer Retainer Spring, Safety, Buffer Retainer, Safety Detent Spring, Safety Detent, Trigger Guard, Trigger Guard Roll Pin, Takedown Detent Springs,Takedown Detents,Takedown Pins, QMS Trigger

This kit 16-003 comes with: Bolt Catch, Bolt Catch Plunger, Bolt Catch Spring, Bolt Catch Roll Pin, Mag Release, Mag Release Button, Mag Release Spring, Buffer Retainer Spring, Safety, Buffer Retainer, Safety Detent Spring, Safety Detent, Trigger Guard, Trigger Guard Roll Pin, Takedown Detent Springs,Takedown Detents,Takedown Pins, ACT Trigger

This kit 16-004 comes with: Grip, Grip Screw Washer, Grip Screw, Bolt Catch, Bolt Catch Plunger, Bolt Catch Spring, Bolt Catch Roll Pin, Mag Release, Mag Release Button, Mag Release Spring, Buffer Retainer Spring, Safety, Buffer Retainer, Safety Detent Spring, Safety Detent, Trigger Guard, Trigger Guard Roll Pin, Takedown Detent Springs,Takedown Detents,Takedown Pins, ACT Trigger

Specifications for ALG Defense AR15-M4 Mil-Spec Lower Parts Kits:

Manufacturer: ALG Defense
Gun Make: AR Platform
Gun Model: AR-15

Package Contents:

  • ALG Defense AR15-M4 Mil-Spec Lower Parts Kits

ALG Defense AR15-M4 Mil-Spec Lower Parts Kits Orderable Models

List of Orderable Models

  • ALG Defense Lower Parts Kit w/ACT Trigger, 16-003 , MPN: 16-003 , UPC: 817953020845 , Code: 1SY-LPK-AARLRPK-16-003
  • ALG Defense AR15-M4 Mil-Spec Lower Parts Kit w/Grip, 08-133 , MPN: 08-133 , UPC: 817953020814 , Code: 1SY-LPK-AARLRPK-08-133
  • ALG Defense Lower Parts Kit w/Grip and QMS Trigger, 16-002 , MPN: 16-002 , UPC: 817953020838 , Code: 1SY-LPK-AARLRPK-16-002
  • ALG Defense Lower Parts Kit w/Grip and ACT Trigger, 16-004 , MPN: 16-004 , UPC: 817953020852 , Code: 1SY-LPK-AARLRPK-16-004
  • ALG Defense Lower Parts Kit w/QMS Trigger, 16-001 , MPN: 16-001 , UPC: 817953020821 , Code: 1SY-LPK-AARLRPK-16-001

ALG Defense AR15-M4 Mil-Spec Lower Parts Kits Unavailable & Discontinued Models

List of Unorderable Models

  • ALG Defense Lower Parts Kit 08-134 , MPN: 08-134 , UPC: 817953020807 , Code: 1SY-LPK-AARLRPK-08-134
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