[Guido02]

Are PSG's made from a different flat than a MSG90?

I know about the cosmetic difference (at least most of them I think). I'm trying to determine the best flat to use for a future PSG build.

This appears to be my best option:
MSG90 Receiver Flat, New Production, 80% no FFL, HK91, G3, HKK-9923, RTG Parts

 

[veritas]

I have been wondering what the conclusion is on those flats. I don't see any reviews and am loath to buy one without knowing what builders experiences are with them.

 

[Darkest2000]

Those look like the most correct flat for use on a PSG1/MSG90 type build due to the omitted scope mounting tabs, which are a pain to remove after the fact. Although still not quite 100% due to slightly different right side reinforcement rib pattern on actual factory guns.

Additionally, HK changed the stamping on later generation MSG90s by removing a short section of the top rib, this is done to accommodate the scope mounting tabs. This can be seen on later PSG1s as well due to the two models sharing the same stampings to reduce cost, even though it doesn't serve a purpose on a PSG1.

 

[Retread]

Guido02, that flat is as close as there is. Jeff at PCS can vouch for builds with that flat. It is Roberts standard flat with the tabs removed from the stamping. Same=Same.