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

I Carry: Smith & Wesson Model 432 TI UC revolver in a DeSantis holster
I Carry: Smith & Wesson Model 432 TI UC revolver in a DeSantis holster

I Carry: Smith & Wesson Model 432 UC Revolver in a DeSantis Holster

In this week's episode of "I Carry," we have a Smith & Wesson Model 432 UC revolver carried in a DeSantis Holsters Super Fly pocket holster along with a Cold Steel Frenzy pocket knife.

The Armed Citizen® Feb. 13, 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.

New for 2026: Warne Maxlite MSR Scope Mount

Putting an optic on an AR-15 just got more affordable thanks to Warne's Maxlite mount.

Putting Red-Dot Optics On Revolvers

The red-dot trend is so pervasive that consumers can choose from a range of semi-automatic handguns that are cut to accept optics. But what about adding red-dots to revolvers?

Quiet Trend Defies Retail Challenges

The business of protecting shooters' hearing is booming—quietly, of course.

New for 2026: Smith & Wesson Model 36 Lipsey’s Exclusive Revolver

Lipsey’s and Smith & Wesson offer a Field Ethos-themed revolver.

Interests



Get the best of American Rifleman delivered to your inbox.