The Gallager carbine was designed by Dr. Mahlon J. Gallager, a Southerner by birth, and manufactured under license by Richardson & Overman in Philadelphia where Gallager had a dental practice. Reportedly 17,728 Gallager carbines were manufactured in three different variations. It has a notch and folding leaf rear sight, blued barrel and casehardened frame, lock plate marked "GALLAGER'S PATENT/JULY 17Th 1860" and "MANUFACTd BY/RICHARDSON & OVERMAN,/PHILADA." above the serial number, smooth walnut stock with patch box, saddle bar and ring. Includes a reloadable metallic cartridge.

Very good, retains strong traces of original blue finish underneath scattered heavy brown surface patina on the barrel, with smooth gray and brown patina on the casehardened surfaces with traces of case colors visible in protected areas. Stock is also very good as lightly sanded and re-oiled, with some light dents and handling marks. Mechanically excellent.