Preview: The Shooter’s Box | .577/450 Martini-Henry Chamber Adapter

by
posted on August 21, 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. **
.577/450 Martini-Henry Chamber Adapter

Thanks to the discovery of a cache of Martini-Henry (MH) rifles in Nepal in 2000, many of these 19th century military arms are commonly available in the U.S., but compatible .577/450 MH ammunition is far less plentiful.

The Shooter’s Box enables MH owners to fire easily obtainable .45 Colt rounds through their rifles, thanks to its U.S.-made, stainless-steel chamber adapter machined to the dimensions of a standard .577/450 cartridge. The adapter provides a clear throat that allows fired .45 Colt projectiles to enter the gun’s rifling.

Due to variances in chamber dimensions, the adapter may not work in all guns, and accuracy can be somewhat lacking, due to varying bore diameters in MH rifles. The price is $69 per adapter.

For more information, please visit theshootersbox.com.

Latest

Ruger American Gen2 Patrol 1
Ruger American Gen2 Patrol 1

Review: Ruger American Gen II Patrol

Ruger's American rifle line represents a good balance between cost and performance, and the latest generation offers many welcome upgrades, as seen on this Gen II Patrol model in 5.56 NATO.

SOG Knives Celebrates 40 Years in Business

SOG Knives, which was established by Spencer Frazer in 1986, is celebrating its 40th anniversary in 2026.

The History of Repeating Arms Gun-Control Groups Don’t Want the Courts to Know

This episode of NRA’s The Armed Citizen Podcast refutes one of the biggest false claims gun-control groups and the politicians they support repeat ad nauseam by asserting that the Founding Fathers could not have imagined the AR-15.

Rifleman Review: Springfield Armory Kuna

Initially designed by Croatian manufacturer HS Produkt to fulfill a military contract, the Kuna has since arrived on U.S. shores through Springfield Armory as a semi-automatic, large-format handgun chambered for the 9 mm Luger cartridge.

All-American AK: The Bear Creek Arsenal BC-47

North Carolina’s Bear Creek Arsenal makes AR-15s, 10/22s and handguns, but new for 2026, it is introducing its first AK-pattern firearm with the BC-47.

Review: TNW Firearms ASR 1911

Reliable pistol-caliber carbines, especially with quick-caliber-change capability, are fun, and the ASR 1911 from TNW Firearms is one of the most unique of the bunch.

Interests



Get the best of American Rifleman delivered to your inbox.