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 HD P4.5
Staccato HD P4.5

Review: Staccato HD P4.5

Combining an exclusive pistol design with a ubiquitous magazine makes the Staccato HD P4.5 practical and desirable.

Skills Check: Rifle Standard Gold

Here’s how to improve your close-range carbine handling.

Caracal USA Awarded Government Contract in the Bahamas for CMP9K

Caracal USA announced it would be supplying its CMP9K platform to various government agencies in the Bahamas.

The Short Life of America’s Anti-Tank Rifles

At the dawn of mechanized warfare, the U.S. Military contended with the reality that infantrymen would need an effective arm to defeat tanks. Their idea? Bring more gun.

Springfield Armory's XD Mod.4 OSP: Anything But Basic

For nearly 25 years, Springfield Armory has offered its affordable and reliable XD series of handguns, and for 2026, that design has now entered its fourth generation with the Mod.4 OSP.

The Armed Citizen® March 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.

Interests



Get the best of American Rifleman delivered to your inbox.