Geissele Standard Lower Parts Kit for AR-15 (No Grip/Trigger)

Description

Building an AR-15 from a stripped lower means you need every little pin, spring, and detent to just work. The Geissele Standard Lower Parts Kit covers all the small internal hardware to complete or rebuild your lower receiver, made to mil-spec tolerances by a name that earned its reputation the hard way. Since it leaves out the trigger and pistol grip, you are free to drop in whatever fire control group and grip you already prefer rather than paying for parts you would swap out anyway.

What Sets This Geissele Lower Parts Kit Apart

The standout piece here is the Posi-Lock safety selector. Instead of the mushy click you get from a lot of bargain kits, this one delivers clean, positive tactile feedback so you know exactly whether you are on safe or fire without looking down. The kit also uses an improved safety detent to keep that selector feeling crisp over time. Builders who run Geissele triggers like the SSA-E often reach for this kit specifically because the parts complement each other and everything drops in without fuss.

Inside the 05-343 Kit

You get 18 different components covering the bolt catch assembly, magazine catch and release, takedown and pivot pins with their detents and springs, buffer retainer and spring, safety detent hardware, the Posi-Lock safety, and a mil-spec trigger guard with coiled pin. In plain terms, that is everything on the lower except the fire control group and grip.

Fit and Real-World Feedback

This kit is designed for mil-spec AR-15 lower receivers, so as long as your lower is mil-spec, these parts will seat where they should. Feedback from builders consistently points to dimensionally correct parts, tight fit, and nothing arriving missing. One tip worth passing along: the trigger guard roll pin can be stubborn, so a proper roll pin tool or bench block makes that install a lot smoother than trying to freehand it with a punch.