Another Noob question, bolts: No.1 vs. No.4

[jmoore]

It's possible that you have a No.4 cocking piece on the SMLE bolt.

The firing pins usually don't interchange, but w/ a bit of effort, it's possible to get them to go together and function.

Is the cocking piece on your SMLE the flat sided type? Markings on it ought to reveal its origins.

(I've even found that SMLE bolts can be made to work in No.4 bodies, but I don't recommend it.)