Polymer80 G150 (RL556)
Polymer80, Inc. · Rifle · Discontinued · 2013
Also known as: G150, RL556, Rhino RL556, P80 G150
Overview
The Polymer80 G150 (marketed in later revisions as the Rhino RL556) is Polymer80's flagship 80-percent AR-15 lower receiver, sold as an unfinished receiver blank and jig kit rather than a complete rifle. Injection-molded from nylon-reinforced polymer with a solid-core design, a stiffened magwell and a mil-spec buffer-tube housing, it was Polymer80's very first product and the platform that launched the company in 2013. Once machined to completion with the included drill and end-mill bits, the receiver accepts standard AR-15 mil-spec lower parts and uppers, producing a lightweight 5.56x45mm NATO rifle. The specifications listed reflect a representative completed 16-inch carbine build on this lower.
Specifications
| Weight (empty) | 2900 g (102.3 oz) |
| Overall Length | 889 mm (35.00") |
| Barrel Length | 406 mm (15.98") |
| Action Type | Gas Operated Direct Impingement |
| Firing Mechanism | Rotating Bolt |
| Trigger Type | Single Stage |
| Magazine Capacity | 30 rounds |
| Magazine Type | Detachable Box |
| Muzzle Velocity | 940 m/s (3084 fps) |
| Muzzle Energy | 1767 J (1303 ft·lbf) |
| Effective Range | 500 m (547 yd) |
| Maximum Range | 3600 m (3937 yd) |
| Barrel Rifling | Right Hand |
| Rifling Twist | 178 mm (7.01") |
| Number of Grooves | 6 |
| Frame Material | Polymer |
| Barrel Material | Steel |
| Stock Material | Polymer |
| Finish | Matte Black |
Calibers
- 5.56x45mm NATO · primary · 5.56mm NATO — also known as .223 Remington, 5.56 NATO, SS109
Features
- Firing modes: Semi Automatic
- Feed systems: Detachable Box Magazine
- Safety mechanisms: Manual Safety
- Features: Accessory Rail, Ar15 Compatible, Stiffened Magwell, Milspec Buffer Tube Housing
Variants
- Polymer80 Rhino RL556v3 — Generation
Production
Production years: 2013-2024
Origin
Country of origin: United States
Designer: Polymer80, Inc.
Discontinued: 2024
Notes
BUILD PLATFORM: Sold by Polymer80 as an 80% AR-15 lower receiver / jig kit, NOT a complete rifle. Accepts standard AR-15 mil-spec parts. The G150 evolved into the Rhino RL556 / RL556v3. Specifications represent a typical completed 16" 5.56 NATO build. This was Polymer80's first product (2013). Discontinued in 2024.
Background
Polymer80 was founded in 2013 in Dayton, Nevada by Loran Kelley Jr. and David Borges, rising to prominence as the dominant maker of 80-percent unfinished pistol frames that let hobbyists legally build their own Glock-pattern handguns at home. The company became a flashpoint in the 'ghost gun' debate; following years of regulatory and legal pressure under ATF Final Rule 2021R-05F, Polymer80 ceased operations in 2024.