Sorry Hugh, but I gotta say as I understand your desscription it more or less seems to me as a full autoconverstion.
In my opinion the firingpin and the trigger bar should be blueprinted, with other words it SHOULD have exact the same measuerments and angles as stated in the original drawings.
In mostly cases those have been flied down and then I weld it up and regrind it in a toolgrinding machine until its exactly like original.
The sear engement should instead be adjusted on either the connector, by bending it you are actually changing the searengagment and triggerpull weight.
This method was espesially used by the swiss who issued unhardend connectors and a special bending device.
Should a standard connector be bent it must first be made soft.
Instead of the problems with unhardening the connector and reharden it afterwards the triggerpull wiehgt and sear engaement can be adjusted at the trigger.
Bending the small sheetmetal piece on the top in diffenrent angels makes different searengement.
The really BAD thing abouth your version with filing down the searengement surfaces is that you are ALSO at the same time making the searengement smaller when the gun is reloading.
So instead of maybe 0.8mm searengement when its reloading you are getting down to maybe 0.1-0,2 mm and its here where the full auto normally happens.
You never get full auto when you are doing the job, but after some wear you get it.
Regards HÃ?Â¥kan Spuhr
http://www.vapensmedjan.com