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Building out an AR-15 lower means chasing down a dozen tiny springs and detents, and forgetting even one turns a good afternoon into a scavenger hunt. This kit from ALG Defense solves that by handing you everything the receiver needs in a single package, right down to the pistol grip and a genuinely better trigger than most kits ship with.
ALG Defense is the value-focused sister company of Geissele Automatics, and that lineage is the whole reason this kit is worth a look. The QMS, short for Quality Mil-Spec, is a standard trigger group that's been tuned by the same crew behind Geissele's high-end match triggers. The sear surfaces are honed smooth to strip out the grittiness you feel in a bargain-bin trigger, but the sear geometry stays untouched, so you keep the bulletproof reliability the mil-spec design is famous for. Pull weight lands right around 6.5 pounds, comfortably inside the mil-spec window and heavy enough for a duty or home-defense build.
The internals are the real story. Trigger and hammer are cut from true 8620 alloy steel castings, properly carburized, quenched, and tempered for hardness that holds up round after round. The trigger and hammer pins step up from soft mild steel to 4140 chrome-moly, centerless ground slightly oversized to cut down on play in the assembly while still dropping into your lower. A full-power hammer spring means reliable ignition across every type of ammo you feed it.
Installation is the same familiar two-pin process any mil-spec builder already knows, so there's no special tooling or learning curve. Because it's built to standard spec, parts swap freely with other mil-spec triggers if you ever want to tinker down the road. Builders who've run these across multiple projects tend to keep coming back, calling it the smart floor for anyone who refuses to settle for whatever trigger the cheap kits toss in.
The QMS is a standard mil-spec trigger group that's been tuned by Geissele's technicians, with the sear surfaces honed smooth to remove the gritty, gravelly feel you get from a typical bargain trigger. The sear geometry itself isn't changed, so you keep the reliability of a stock design while getting a noticeably cleaner break. Think of it as the smart step up from whatever trigger the cheap kits toss in without jumping to a pricey match trigger.
It runs right around 6.5 pounds, which sits comfortably inside the mil-spec window above the 5.5-pound minimum and well below the 9.5-pound ceiling. That weight makes it a solid choice for a duty, defensive, or general-purpose build. If you ever want it lighter, some builders swap in a reduced-power spring down the road, though the full-power spring it ships with is there for dependable ignition.
Yes, this kit covers the full lower receiver build, including the bolt catch and its pins and springs, magazine release, safety selector and detent, buffer retainer, trigger guard, takedown and pivot pins with their detents and springs, plus the fire control group and a pistol grip. You supply the stripped lower receiver and buffer tube assembly. Everything in the kit installs with standard tools.
Not at all. It uses the same familiar two-pin installation as any standard mil-spec fire control group, so if you've built an AR before, this will feel routine. There's no special tooling or fitting required, and maintenance follows the exact same procedures as a stock trigger.
| UPC | 817953020838 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | 16-002 |
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