These case hardened Spencer Breech Blocks will fit 99% of the time and are NSSA approved. So far I have tried over a dozen in my personal carbine they have all fit but I won't go as far as to say they will fit 100% of the guns out there. These breech blocks will fit 1860 and 1865 model Spencer rimfire to convert to centerfire.
| Spencer Breech Block |
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