Which factory made this No. 4 Mk I?

[Beerhunter]

Beerhunter and Mk.VII

I think jbrid just removed the safety for some photos so the ‘M’ underneath it could been seen. The safety is present in other shots.

45B20

The part that is missing is not the operating lever of the safety, it is the safety catch. (The part that engages with the the side of the bolt. It is clearly missing from the two photos in which it would be visible. It should protrude from the hole to the right of the letter M and is obviously not there. (It would not need to be removed in order to photograph the letter M.)

Information

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[krinko]

"The part that is missing is not the operating lever of the safety, it is the safety catch..."

It's a wartime No4, the safety catch is most likely missing because the locking bolt is a Mk2 and was never threaded for the catch.
-----krinko

[Finestkind]

It is there in one of the other photographs.

Chuck

[Roger Payne]

Going back to the original question, it's definitely a BSA Shirley. BSA initially marked their rifles with a 'B' (1941 till some point in 1943), then they commenced using the foctory coding in 1943, but for a short while only used M47, before adopting the full M47/C from later in 1943 till the end of production.

ATB

[Maple_Leaf_Eh]

Cuss ugly markings from Century! That is enough to make a guy get out the emery cloth and a buffer.

[Roger Payne]

I've done it a few times myself Maple leaf!

ATB