Knight MK-85: Popularizing The In-Line Muzzleloader

by
posted on July 13, 2022
** 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. **
Mk85

There’s an undeniable satisfaction in muzzleloading. Attempts at explaining the attraction often claim it’s the added challenge of a single shot, history lesson, skill polished with longer lock times or pleasure when the balancing act between propellant and bullet weight shrink groups. It’s all that and more, but in a gentle mix unique to every enthusiast, a blend that has kept the relatively primitive firearms alive, while others have gravitated to the convenience of metallic cartridges and self-loading guns.

Traditional blackpowder, however, is messy, volatile and requires thorough cleaning after use. That burden prevented some from participating in muzzleloading until 1975, when Hodgdon introduced Pyrodex. The blackpowder substitute eliminated a lot of the headache, although the relatively exposed ignition systems on “smoke poles” still fell victim to inclement weather.

That changed in 1985, when Knights introduced its MK-85. The in-line design launched a revolution in muzzleloading by placing its percussion cap nipple directly behind the chamber, where it was sheltered from rain, snow and spark-robbing humidity to introduce spark to the propellant reliably and consistently.

Company founder Tony Knight is often cited as the inventor of the in-line design, although that honor really goes to Jean Samuel Pauley. His patent for the approach was approved by England in 1812, only two years after the percussion cap was invented. What Knight did receive his initial patent for was an innovative knurled safety on the muzzleloader’s plunger-style hammer. With a simple twist of the knob concerns about a negligent discharge were alleviated, but that wasn’t enough—there was also a trigger safety on the MK-85.

The MK name honors Knight’s daughter, Michelle Knight, followed by the year of its introduction, 1985. It had a 24" barrel and was available in either .50- or .54-caliber. Receivers were drilled and tapped for scope mounting, but the muzzleloaders shipped with a bead up front and adjustable metallic sights at the rear. Sling swivel studs and a recoil pad rounded out the design, which throughout its run was available with wood, wood laminate or synthetics stocks in various camo patterns. With a removable breech plug and hammer, routine maintenance was a breeze.

The design launched a revolution in muzzleloaders, and Knight invested considerable effort to increase the use of so-called "primitive weapons" during big game seasons across the nation. His design and dedication made a huge difference.

Knight sold the company to a father and son in 1991. Pradco purchased it from them in 1999, but sales failed to meet corporate expectations. Knight Rifles closed its doors in 2009. Thankfully, in 2011, Plastic Industries, Inc. resurrected the company and offers a complete line today. Unfortunately, the MK-85 is no longer part of the lineup.

Used MK-85 prices vary wildly, increasing with condition and model. Some of the hand-selected, limited runs that carried an MSRP of $1,000 in the late 1990s go for more today, while you can find field versions in good condition occasionally at or below $300 without optics.  

Latest

45 ACP M1911
45 ACP M1911

Myths & Misunderstandings About the “Modern Fighting 1911”

The Colt Model 1911 pistol and its derivatives are among the most iconic military handguns ever made. But in 2026, does the M1911 still hold up as a quality defensive arm?

Heir Apparent: The CZ 600+ Carbine

CZ's 527 action was long a popular option scaled around compact cartridges like the .223 Remington and the 7.62x39 mm. Now, the new CZ 600+ Carbine brings that same concept to the company's new CZ 600 series.

I Carry: Smith & Wesson Model 386 Night Guard in an ANR Design Holster

In our latest "I Carry" setup, we're featuring the Smith & Wesson Model 386 Night Guard in an ANR Design holster, and we've got a Streamlight EDC flashlight to round out our kit.

The Armed Citizen® Oct. 23, 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.

NRA Announces Nominating Committee & Petition Nominees for the 2027 NRA Board of Directors Election

The National Rifle Association has announced the official list of all 33 candidates nominated for the 2027 mail ballot election of directors, whether by the Nominating Committee, by petition of the members or both.

Saltstone Integrator Rifle Carry System & Modular Hunting Vest: The Cure for The Common Sling

Among a hunter’s most basic equipment is their sling. The Saltstone Integrator Rifle Carry System and Modular Hunting Vest seeks to revolutionize this.

Interests



Get the best of American Rifleman delivered to your inbox.