Reportedly, 17,728 Gallager carbines were manufactured in three different variations during the Civil War, according to "Flayderman's Guide" (9th Edition, 9B-051, 9B-052, 9B-053). 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. It has a pinched blade front sight, 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 blued patch box, saddle bar and ring.

Very good, with a small separated crack visible in the bottom left of the frame, retains 50% original blue finish on the barrel with smooth brown patina on the balance, 30% plus original case colors, with scattered moderate freckling, and sharp edges and markings in the metal. Stock is very good as revarnished with some scattered dents and scratches, and a chip to the right of the lower tang. Mechanically excellent.