Bushmaster ACR Caliber Conversion System Comes to Market

by
posted on October 11, 2018
** When you buy products through the links on our site, we may earn a commission that supports NRA's mission to protect, preserve and defend the Second Amendment. **
finalacr-beauty-shot-1.jpg

After eight years of anticipation, the Bushmaster Unicorn, also known as the ACR caliber conversion, has finally hit the market. This caliber conversion system for the ACR, a platform that offers fully ambidextrous controls, improved ergonomics, an ultra reliable gas -piston operating system, and tool-less configuration and caliber adaptability, is promised to be the first of many caliber options. For now however, these conversions will be offered in .450 Bushmaster, and 6.8 Rem. SPC II. For a complete list of the options now available, please see the chart below:

Product Specifications

Product

Order #

Barrel

Magazine Capacity

2018 MSRP

16” .450 Bushmaster ACR Conversion

90023

16” FNC Treated 4150 CMV, 1:24”
twist

5 Round Polymer

$699

18.5” .450 Bushmaster ACR Conversion

90024

18.5” FNC Treated 4150 CMV, 1:24” twist

5 Round Polymer

$699

16” 6.8 Rem. SPC II ACR Conversion

90028

16” FNC Treated 4150 CMV, 1:11” twist

25 Round

$699

 

Latest

SDS Arms MAC-5K
SDS Arms MAC-5K

Review: Military Armament Corporation MAC-5K

SDS Arms, under its Military Armament Corporation (MAC) brand, imports Turkish-made roller-delayed handguns of the H&K MP5 pattern called the MAC-5K.

8 New Revolvers for 2026

Despite the incredible array of polymer-frame, striker-fired, semi-automatic handguns on the market, the classic revolver not only refuses to die, it has seen something of a resurgence in recent years.

The Armed Citizen® May 18, 2026

Read today's "The Armed Citizen" entry for real stories of law-abiding citizens, past and present, who used their firearms to save lives.

8 New Semi-Auto Shotguns for 2026

For 2026, the semi-automatic shotgun market has seen even more growth, with some manufacturers expanding their current offerings and other makers entering the marketplace with novel designs.

SAAMI Celebrates 100th Anniversary

For the past 100 years, the Sporting Arms and Ammunition Manufacturers’ Institute (SAAMI) has established the standards that ensure our safety when using modern shotshells, cartridges, firearms and more.

Shooting Is Fun: How I Rediscovered the Benefits of Rimfire

A recent event at Range Ready in Robert, La., reminded us how much fun the simple rimfire firearm can be, whether in handgun, carbine or rifle form.

Interests



Get the best of American Rifleman delivered to your inbox.