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

SA 35 4 Polished 01
SA 35 4 Polished 01

Short & Sweet: Springfield Armory's SA-35 4" Polished Blued

Springfield Armory continues to expand its SA-35 High Power handgun line, and one of the latest versions is this new SA-35 4" Polished Blued model that provides some added luster while remaining compact.

75 Years of CCI

What better time to look at what’s new at CCI than when the company's celebrating 75 years in business?

The Galactic Pistol Alliance: An Entry Point For New Competition Shooters

Galactic Pistol Alliance jettisons rule confusion and offers a much more relaxed model for newcomers to competition shooting, all while keeping cool shooting stages and an emphasis on safety.

NRA Supporter & Gold Expert Mike Fuljenz Wins Newsletter Award

Longtime NRA Supporter Mike Fuljenz, founder of Universal Coin & Bullion, was awarded the 2026 Best Investment Newsletter award by the Numismatic Literary Guild. 

Keepin’ It Simple: Chiappa Wildlands 92 Field & Core Models

Chiappa USA is returning the Wildland series of lever-action rifles to its roots with the 92 Field and Core, designs that keep it simple while still offering modern features.

The Armed Citizen® Oct. 5, 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.