Rifleman Q&A: Mysterious ‘Trapdoor’

by
posted on April 25, 2023
** 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. **
1870 Springfield Officer’s Model Carbine

Q: I have what I believe to be an 1870 Springfield Officer’s Model Carbine. What I have researched is that these rifles were converted from caplock to a centerfire mechanism, and vernier sights were added. The rifle I have is converted from flintlock using a similar, if not the same, mechanism for firing centerfire cartridges. The only marking is found at the top, rear of the breech and it reads:
“Model 1870.”

I cannot find a single callout in Flayderman’s reference book or the NRA museum website. Is my conversion authentic?


A: You have an interesting piece. “Trapdoor”-style rifles and carbines have regularly been altered to look like flintlock muskets and rifles, blunderbusses and even pistols by the motion picture industry for use as prop guns. These conversions are generally fairly crude (only good enough to look good on camera) and are normally undertaken using later arms chambered in .45-70 Gov’t. in order to take advantage of readily available blanks. 

Your piece, on the other hand, it being a Model 1870, is most probably chambered in .50-70 Gov’t., unless it has been re-chambered. The work appears to be of excellent quality; I have never seen anything quite like it and can only opine that the work was likely undertaken by some gunsmith or talented hobbyist who wanted to fire a “flintlock” without all the attendant bother. The fact that the piece also has an anachronistic, vernier-style rear tang sight indicates that it was intended for shooting rather than just for show.

—Garry James, Field Editor

Latest

Staccato P4x Review 1
Staccato P4x Review 1

First Impressions of the Staccato P4X

Down in Texas, Staccato launched a new pistol to celebrate America's 250th anniversary: the P4X. One can hardly blame them considering that the company's entire product line is based on the 1911, arguably the most American of handguns.

A Big Third Circuit Ruling on America’s Rifle

In an appeal of a case the NRA filed in 2018, the U.S. Court of Appeals for the Third Circuit struck down New Jersey’s ban on “assault weapons” and “large capacity” ammunition magazines as unconstitutional.

Top Cop: How an Armed American Saved President Trump’s Life

An NRA Benefactor Member and NRA Certified Law Enforcement Patrol Rifle Instructor, Sergeant Aaron Zaliponi likely saved the life of President Trump in Butler, Pa. For these reasons, the NRA has selected him as the 2025 Law Enforcement Officer of the Year.

Review: Rock River Arms A1 Carbine SBR

The Rock River Arms A1 SBR is just plain cool, and there’s little justification needed beyond that for picking up a new gun. It’s a mixture of throwback, retro and nostalgia with a bayonet lug, and you just can’t go wrong there.

The Armed Citizen® July 20, 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.

Plinking Perfect: 5 Must-Haves for Your Next Rimfire Shoot

What better way to celebrate 250 years of freedom than to go out plinking this summer? Here are five great products that will make your next rimfire range trip better than ever before.

Interests



Get the best of American Rifleman delivered to your inbox.