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

Taurus 66 Combat
Taurus 66 Combat

Review: Taurus 66 Combat Revolver

Taurus’ new 66 Combat shows that even revolvers can get with the times.

New For 2026: Silent Steel USA Streamer Series PCC Suppressors

If there are two things that are popular in the firearms world right now, it is suppressors and pistol-caliber carbines (PCC). Silent Steel USA has both bases covered with its new Streamer Series PCC suppressors.

The Armed Citizen® March 30, 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.

Colt Canada Awarded Contract to Modernize Canadian Service Rifles

Colt Canada has been awarded a $273 million contract to modernize Canada's fleet of military rifles through the Canadian Modular Assault Rifle Project.

First Look: KA-BAR Slabby

Few proprietary eponyms in the knife world are as well-recognized as KA-BAR, the combat/utility design originally requested by the U.S. Military during World War II and used with success by countless troops in conflicts since.

American Fowlers: The Colonial Longarm for Hunting & Home Defense

In colonial America, it was firearms from other countries that armed soldiers, but for most of the civilian populace, American-made fowlers fit the bill.

Interests



Get the best of American Rifleman delivered to your inbox.