This rifle is the second type version of the Allin conversion trapdoor in .50 caliber centerfire. The breech loading “Trapdoor” mechanism, designed by Master Armorer Erskine S. Allin of the Springfield Armory was adopted in 1865 and 5000 model 1861 rifle-muskets were converted to this system in .58 rimfire. The second conversions of 1866 differs in caliber from the previous model being reduced to .50 by the bore being enlarged and a liner tube inserted and brazed in place. Other changes that were added are the lengthening of the bolt, a firing pin spring and stronger internal extraction system, which dispensed with the rack and pinion type. Accentually, this rifle is the Model 1864 type II musket that has been converted to this system. Records indicate the total numbers altered at Springfield were 25,000 rifles.

This available specimen is dated 1864 on the lock plate and 1866 on the receiver. The metallic components - barrel, receiver, barrel bands, cleaning rod, trigger guard and butt plate - exhibit some mild surface pitting and patina, mostly located along the barrel length. The lock plate still shows signs of case hardening. Lock action is still tight and crisp and the receiver mechanism operates well. As for the walnut stock, there are several gouges located on the left side between the second and lower barrel bands and one on the right side above the center barrel band spring. The rest are various dents and scratches. No cracks located at the wrist area or butt. The only missing item is a barrel band retainer spring on the upper band. Moderate rifling is left in barrel, but needs a good cleanout.

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