AR-15 – Lower Parts Kit – 5.56 NATO/.223 Remington – Black
PLEASE DOUBLE CHECK DETAILS AND FITMENT BEFORE PURCHASE.
This Doublestar Corp. AR-15 Lower Parts Kit is built for AR-15 lower receiver builds chambered around the standard 5.56 NATO/.223 Remington platform. It includes the core lower receiver small parts, fire control group, A2-style pistol grip hardware, and the pins, springs, and detents needed to complete or rebuild a stripped lower.
Doublestar notes its fire control group uses mil-spec heat-treated 8620 steel, and the kit includes an extra takedown detent and spring because those tiny little gremlins love launching themselves into another dimension during assembly.
Fitment
- Fits standard AR-15 pattern lower receivers.
- Intended for 5.56 NATO/.223 Remington AR-15 builds.
- Works for standard semi-auto AR-15 lower receiver completion or replacement work.
Does NOT fit
- Does not fit AR-10/LR-308 pattern lowers.
- Does not fit AK, PCC-only proprietary lowers, or non-AR-15 receiver systems.
- May not fit proprietary billet lowers or specialty receivers that require non-standard pins, controls, or trigger guard hardware.
What it does
This kit supplies the working lower receiver parts needed to complete the controls, fire control group, takedown system, buffer detent, and grip hardware on a standard AR-15 lower. It is the guts of the lower, not the flashy part—but without it, your build is just an expensive paperweight with attitude.
Why it’s worth it
A good lower parts kit matters because small parts are where cheap builds start acting stupid. This kit gives you the main lower receiver components in one package, including the fire control group and extra small parts that help keep the build moving when a detent escapes across the shop.
Specs
- Brand: Doublestar Corp.
- Platform: AR-15
- Caliber/platform reference: 5.56 NATO/.223 Remington
- Finish: Black
- Fire control group: Included
- Pistol grip: Included
- Made in USA: Manufacturer-listed
What’s included
- Fire control group
- Fire control group pins and springs
- Bolt catch assembly
- Magazine catch assembly
- Front pivot pin
- Rear takedown pin
- 2 takedown springs
- 2 takedown detents
- Trigger guard pin
- Pistol grip
- Pistol grip screw and washer
- Buffer detent
- Buffer detent spring
Tools needed
- Bench block or stable work surface
- Roll pin punches
- Small hammer
- Pivot pin tool recommended
- Safety glasses recommended unless you enjoy hunting springs under the refrigerator
Install notes
Installation should be handled carefully, especially around the fire control group, bolt catch roll pin, pivot pin detent, and buffer detent. After installation, perform a full safety and function check before live fire.
Verify before you buy
Verify that your lower receiver is a standard AR-15 pattern lower and does not require proprietary lower parts. If your receiver uses specialty controls, non-standard pins, or a proprietary trigger guard setup, confirm compatibility before ordering.
⚠ Install & Compatibility Disclaimer
Installation should be performed by a qualified armorer or gunsmith. Improper installation, modification, or use may affect firearm safety and reliability. Buyer is responsible for verifying compatibility, performing proper function testing, and ensuring safe operation.
