Lee Enfield #1MKlll receiver w/holes in barrel threads

[Amatikulu]

Hello, I recently purchase a Lee Enfield #1MKlll striped receiver on Gunbroker. On each side of the receiver barrel threads there are 1/4" holes at 3&9 o'clock near the front shoulder of the receiver. Is this receiver still usable? Why would this be done? I have never seen this before except for the gas port and it also has one. Your help would be appreciated. Thanks John

No, the receiver is not usable and under no circumstances should you attempt to "repair" it. It is useful only as a paper weight. Those 1/4" holes were drilled to make a visible defect in the receiver indicating that it is unsafe to fire ammunition in it.