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

Rifle with ammo and ruler
Rifle with ammo and ruler

How Accurate are Today’s Rifles?

In just the last few decades, rifle accuracy has improved an astonishing amount, and our expectations have risen accordingly.

New for 2026: GForce Arms LVR30S in .30-30 Win.

One of the latest .30-30 Win. lever guns comes from an unexpected place: Turkey. New for 2026, GForce Arms has introduced its LVR30S.

The Armed Citizen® Sept. 21, 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.

5 Must-Have Tools for DIY Gunsmithing

These gunsmithing tools make it much easier to work on your firearms, whether at home or in the field.

Garmin Acquires Applied Ballistics

Garmin has acquired Applied Ballistics, a leading provider of ballistic research, projectile data and integrated solver technologies dedicated to enhancing shooting accuracy.

NRA Leaders Attend White House Dinner as President Trump Signs Orders Expanding Access to Public Lands and Waterways

NRA Executive Vice President and CEO Doug Hamlin and Institute for Legislative Action Executive Director John Commerford represented NRA members at a White House dinner hosted by President Donald J. Trump.

Interests



Get the best of American Rifleman delivered to your inbox.