# Radian AX556 Multi-Caliber AR Lower - Versatile & Durable

**Brand:** Radian Weapons
**Category:** Parts
**Caliber:** Multi-Caliber

## Specifications

- **Caliber:** Multi-Caliber
- **UPC:** 817093021283
- **SKU:** UCENtP2w7

## Description

The Radian AX556 is an AR-platform lower receiver built to multi-caliber spec from aluminum with a Radian Black finish. It's designed around the standard AR-15 configuration, which means broad compatibility with existing uppers, furniture, and components.

### Key Specifications
- **Caliber:** Multi-Caliber
- **Model:** AX556
- **Finish:** Radian Black
- **Material:** Aluminum
- **Gun Model:** AR-15
- **Gun Type:** AR Platform
- **Condition:** New in Box
- **Manufacturer:** Radian Weapons
- **Manufacturer Part Number:** R0166
- **UPC:** 817093021283

### Detailed Features

The multi-caliber designation lets users run different upper assemblies on the same lower, useful if you're building multiple caliber-specific uppers without buying separate lowers for each. The aluminum construction keeps weight down. Radian's machine tolerances and anodizing are consistently cited as tight and clean. The AR-15 footprint means standard trigger groups, pistol grips, and stocks drop right in.

## What Reviewers Say

*Quoted verbatim from YouTube reviews. Each link opens the video at the moment quoted.*

> I'm looking forward to this build and i know i have already started off on the right foot with this lower receiver.
>
> — [Surgical](https://www.youtube.com/watch?v=OoDrJ-UDDYg&t=196s)

## What Customers Say

*AI-generated insights from customer reviews*

The Radian AX556 multi-caliber AR lower draws consistent praise for build quality. Owners point to the machining tolerance and fit finish as noticeably above average compared to budget lowers. The receiver fits snugly with a range of uppers without slop. Multi-caliber compatibility is the main reason people choose it over a standard lower, and that flexibility is well regarded by builders who run more than one caliber on the same platform.

The most common criticism is price. Radian positions the AX556 as a higher-end option, and some buyers weigh it against less expensive lowers that function similarly. Those who buy it tend to view the cost as justified by the machining quality and long-term reliability. Assembly and fitment during builds get positive marks for being straightforward.

## Pricing

**4 offers available**

| Vendor | Price |
|--------|-------|
| Gunbuyer Com | $514.95 |
| Impactguns Com | $514.95 |
| Grabagun Com | $514.95 |
| Deguns | $517.99 |

## Similar Products

- [Radian AX556 Billet Lower - Brown Cerakote 5.56 AR-15 Receiver](https://gunsnation.com/p/radian-ax556-billet-lower-brown-cerakote-5-56-ar-15-receiver/UCENtP3Zh)
- [Radian AX556 Precision AR-15 Lower - FDE 5.56/.223 Billet](https://gunsnation.com/p/radian-ax556-precision-ar-15-lower-fde-5-56-223-billet/UCENtP3ZJ)
- [Anderson AR-15 Multi-Caliber Stripped Receiver, Black Anodized](https://gunsnation.com/p/anderson-ar-15-multi-caliber-stripped-receiver-black-anodized/UCCXDmkai)
- [Radian Weapons Model 1 AX556 OD Green](https://gunsnation.com/p/radian-weapons-model-1-ax556-od-green/UCENtP3HG)
- [SanTan Tactical STT-15 Lite Multi-Caliber AR Receiver - Black 7075-T6](https://gunsnation.com/p/santan-tactical-stt-15-lite-multi-caliber-ar-receiver-black-7075-t6/UCByu4Bap)
- [Spike's Tactical ST15 Black Anodized Multi-Caliber Receiver](https://gunsnation.com/p/spike-s-tactical-st15-black-anodized-multi-caliber-receiver/UCF432ZBV)

---
*Data from [GunsNation](https://gunsnation.com)*