Receiver PartsAlg DefenseSold by Brownells

Alg Defense

Ar-15 Lower Parts Kit W/ Qms Trigger

Our editorial team reviews specifications, product data, and field-use information to keep pages accurate.

Complete Ar-15

QMS trigger included

Includes Bolt

Catch, magazine release, safety, and

Comes Trigger

Trigger guard, takedown pins, detents,

Offered Without

Or without the grip

Manufactured Alg

Defense

$93.00
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SKU: 100042561

Overview

Built for assembling or refreshing an AR-15 lower, this complete parts kit brings together the core controls and small components needed for a functional setup. It includes the QMS trigger along with the bolt catch, magazine release, safety, buffer retainer parts, trigger guard, and takedown components, giving builders a single-source solution for the lower receiver. The option to choose the kit with or without the grip adds flexibility for matching existing preferences or parts already on hand. For hunters and shooters who want a straightforward parts package without extra frills, this kit keeps the focus on the essentials.

Why Hunters Choose the Alg Defense

Complete Lower

Parts kit includes the QMS

Covers Core

Lower receiver components in one

Includes Bolt

Catch, magazine release, safety, and

Supplied Takedown

Takedown detents, springs, and pins

Available Without

Or without the grip to

Key Features

  • Complete AR-15 lower parts kit with QMS trigger included.
  • Includes bolt catch, magazine release, safety, and buffer retainer components.
  • Comes with trigger guard, takedown pins, detents, and springs.
  • Offered with or without the grip.
  • Manufactured by ALG Defense.

Best Used For

  • AR-15 builders needing a complete lower parts kit with QMS trigger included
  • Users assembling a lower receiver who want the option to add their own grip
  • Shooters replacing worn lower receiver components with a single matched kit
  • Builders seeking a straightforward parts package for a standard AR-15 lower

Specifications

Grip OptionWith or without the grip
Kit ContentsBolt 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
TriggerQMS Trigger

Pros

  • Complete lower parts kit includes the QMS trigger for a more complete build package.
  • Covers core lower receiver components in one kit, reducing separate parts sourcing.
  • Includes bolt catch, magazine release, safety, and buffer retainer components.
  • Supplied with takedown detents, springs, and pins for assembly support.
  • Available with or without the grip to suit build preferences.

Considerations & Trade-offs

  • Includes the QMS trigger, so the kit is not just a basic lower parts set; buyers should account for that added component when planning the build.
  • Grip availability is optional, so the final setup depends on which version is selected at purchase.
  • This is a parts kit rather than a complete lower, so additional components are still required to finish an AR-15 build.
  • The listing does not specify individual part materials or finish, so buyers needing exact component details should verify before ordering.

Suggested Comparisons

  • AR-15 lower parts kits
  • AR-15 trigger groups
  • AR-15 receiver build components
  • AR-15 small parts and controls

Suggested Accessories

  • AR-15 grip
  • Trigger guard
  • Lower parts kit
  • Safety selector

Frequently Asked Questions

What parts are included in this lower parts kit?

The kit includes a 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, and a QMS Trigger.

Does this kit come with a grip?

The product description says you can get the kit with or without the grip. The provided data does not specify which version is included for this listing.

What trigger is included?

This kit includes a QMS Trigger.

Is this a complete lower parts kit?

Yes. The description identifies it as a complete lower parts kit with a QMS Trigger.

Who makes this kit?

The manufacturer listed in the product data is Alg Defense.