Hi ldpfeifer,
I've got to ask. Did you ever spring for that 1865, $3500.00 Spencer Carbine? Guess you didn't.
And shame on you. You never joined SSS!! To join I will just need your Email address. Just send me an Email at fsgrand2@fairpoint.net and I'll add your username to our membership list.
Nearly all center fire blocks need some work for better fitting. If there are none available at Buffalo then give S&S your order, I don't think you have any other choice at this point. eBay? I'm pretty sure I have the S&S Centerfire Block in one of my Spencer Carbines . . . no issues with firing, and both did require some filing and fitting to work properly.
Two Flints