From my limited knowledge the "Irish" Mark 1*** rifles were re-numbered with the second number and prefix ER and CR prefix. The ER prefix rifles were basically unchanged while the CR pre fix rifles were rebuilt with Mark 111 parts and wood to different degrees.
The G prefix (often the third serial number) were for grenade launching except some G pre fix rifles had the wrap removed or restocked and became standard rifles. My photo show a G 839 serial number that was changed back to a standard rifle, there are still faint marks on the handguard from the wire wrap. When Mark 111 fore-ends were used sometimes patches were used and the front hand guard modified insideAttachment 100255Information
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