Need help IDing a Lee Enfield bolt

[Citizen soldier]

Hi all,
Any idea's where this bolt for my No4 Mk2 was made?
It has an odd U shaped symbol on in and I am hoping it is not a Kyber Pass make

[plantie]

could you please take another picture as it hard to see the "u"

HI Plantie,

A pic of the mag which has the same serial and markings