This Lower Parts Kit from ALG Defense (brand part no. 16-001) bundles the small internal parts needed to complete a stripped AR-15 lower receiver — hammer, disconnector, springs, detents, pins, and the buffer retainer and takedown pin hardware — built around ALG’s QMS (Quality Mil-Spec) single-stage trigger group. It’s a straightforward way to finish a stripped lower build with a proven mil-spec-reliable trigger.

Key Specifications

• Includes the hammer, disconnector, and their springs to complete the fire control group.
• Also includes the detents, pins, buffer retainer, and takedown pin hardware needed to finish the lower.
• Built around ALG’s QMS (Quality Mil-Spec) single-stage trigger group.
• Does not include a pistol grip.
• Sold as a small-parts kit, not a complete firearm — it’s classified as a firearm accessory, so no FFL transfer is required to buy it.

Frequently Asked Questions

What trigger does this kit include? ALG’s QMS (Quality Mil-Spec) single-stage trigger group, a mil-spec-reliable design.

Does this kit include a pistol grip? No, this version does not include a grip; ALG also sells a with-grip version of this kit.

Buy the AR-15 Lower Parts Kit with QMS Trigger

Finish your stripped AR-15 lower build with this ALG Defense parts kit and QMS trigger. It ships fast from our Lubbock, Texas gun shop, and our AR lower parts kits selection has more lower parts kit options.