I just picked up a No 4 Mk 2, it's been sporterized (poor thing), but I got it for a song so I figured it'd be a good little project.

To begin with it's marked:
No 4 Mk 2 A18197
F 57 FTR

Here's where things get interesting, the backsight is marked:
F
CR403

Correct me if I'm wrong here, but isn't this a 7.62x51mm sight with the datum line recut to read in meters?

Also, am I correct that the portion of the trigger guard that surrounds the magazine is of a different shape on 7.62mm rifles than on .303 ones? And further, that 7.62 magazines should not fit up far enough into the magazine way to allow ejection of spend rounds unless modifications were made to the underside of the receiver?

I'm very curious as I compared the above mentioned areas on this rifle to my DCRA Enfield and found them to be identical. My Enfield 7.62mm mag fits and ejects rounds.

One other oddity I came across was a marking on the inside of the channel that runs down the body of the bolt that reads "P20". Anyone have any idea what this means?

I'm really puzzled by what I've got here. Photos to follow this weekend.

Cheers!
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