Mixmaster
So, I am still learning. My LSA has the original barrel on it (same serial number, matching wear, etc. Other than that, I have:

An RFI stamped Ishapore magazine, but scrubbed and restamped with the same serial number as the receiver and barrel.
An RFI stamped Ishapore rear sight with a non-matching serial number.
A Lithgowicon front sight blade ('A' inside an 8 point star).
A brass butt plate with a worn '232' stamped on top.
An IS stamped Ishapore bolt.
A BA stamped Bathurst Rifle Factory noseguard (no serial number).
A 'G3 and B' stamped (under crown) Birmingham Small Arms trigger.

The trigger guard has the same 'C' as the front handguard and rear sight protector?

And the following mystery marks.

Rear sight protector.

Front hand guard.

Behind charger bridge. The 'A'?

And what does the "O" or "0" mean above the serial numbers?
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