L4 Firing Pin Mark

[Brit plumber]

Sounds very much like it, I think the GPMG had a normal type firing pin but its 15 years sincle I last worked on one.

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[tankhunter]

Sounds very much like it, I think the GPMG had a normal type firing pin but its 15 years sincle I last worked on one.

You are correct. The L7 GPMG has a straight Firing Pin that goes completey through the Breech Block. The Pin tip is a Normal round profile.
The Bren (.303") & subsequetly Modified LMG (7.62mm) Utilised the same Bren Firing pin with the distinct OVAL tip Profile.