No4 MK1 identification

[CINDERS]

So my question relates to the bolt if its not been fitted correctly then there may be consequences not desirable in firing the rifle one would/should err on the side of caution and have it checked over by a gunsmith conversant with the fitting up of a bolt on the Lee Enfields as its not just a case of popping in a H/Space gauge and saying its good to go.
As there are recoil surfaces that need to be correctly fitted up so they take the firing of the rifle correctly, the mag you should be able to adjust if it has feed issues from searching this site for info otherwise there are the chaps who have the knowledge to assist you with your inquiries.

Serial looks like A ? (C) 2 ? (3) 9 9 (A C 2399)