Another Feeding Problem

[Mike77]

With 7 rounds in the magazine the first 4-5 rounds do the following:

-round stripped out of the magazine and fed into chamber;
-breachblock will not close completely (open about 1/2");
-a light push on the toggle will close the breachblock;
-fires, ejects, feeds another round but breachblock will not close completely.

Does this on every round until the last 2-3 rounds then it functions perfectly.

I've used Fiocchi and some stiff reloads. Doesn't matter which are used same thing happens.

Same thing happens on the orginal magazine except feeding isn't as reliable.

Gun has been cleaned with brake cleaner and lightly lubed.