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If you look at the later HK series G3 rifles the PSG & the MSG90 , both of these use different mounting systems , over the older claw type mount , also the Sweds , when they did a refurb on their G3s...

The only thing I know about them is they are only really suitable for a very small optic , like the 4x24mm military scopes that bolted to the mount , put a large scope on them and they donot hold up...