OK regarding safety...
Did you remove the copper plate on the selector plate when affixing sticker for sensor ???
View attachment 69703
What "might" be taking place is the safety cam, (looking like a bloke with a big nose)
the cam or arm is not being pushed back to 12 o'clock when inside the receiver
Safety very likely all works fine on the bench with grip/motor
but when you install it the selector plate is not pushing the safety cam/arm to exactly 12 o'clock
but just a whisker shy say 12:15 ~ 12:30 (taking the safety arm as the little hour hand)
It is a whisker shy of 100% 12 o'clock and the way shit works the actual safety stop is just below trigger's stop
and this just slips under the limit stop of trigger and fires on SAFE
Now if you removed the copper plate you likely lost near 1mm of travel pushing safety arm into position
If you kept the copper tab - then it "should" still operate correctly, hence when had issues with new trigger
I said use old one - which seemed to help
Anyway....
What you might need to do is add a small whisker of material on the left side of selector plate tab
if you have removed the copper plate, then perhaps super glue a capillary straw/pipe like WD40 tube
to left side of selector tab & test - you just want something 1~2mm max glued on to test
(if it works then add a bit of epoxy or glue it properly onto the selector plate)
Basically anything to increase the travel slightly on SAFE so safety arm rises a whisker more to engage it a
If you have the copper plate still on the selector plate, then just add a little line or drizzle of solder to left side
I broke the cm.515 selector getting in/out a few times & used a cheapo one lying around
unfortunately the same thing happened, on safe the gun was very like yours, mostly still able to fire
I drizzled a slither of solder onto the left side of copper plate and the arm then raised fully to stop the trigger
If you haven't removed the copper plate then it doesn't make sense why it isn't working correctly as it was
and you must check the arm itself is not fouling on the Perun inside the box - shouldn't be but check just in case
if it isn't fouling, then chances are for a bit of wear & tear or other reason the selector is not pushing the safety cam
quite enough to the left safe position to ensure the arm itself rises fully
(the oem cheapo orange v2 selector plate I used was made ever so slightly different, the arch was cut a smide over
and so the TM compatible bollox - even with the copper plate fitted, failed to raise the safety 101% correctly like before
a slighter of solder, sticking to the copper plate like shit to a blanket did the trick
or glue a piece of material (plastic strip or say outer insulation sleeve from old wire bit of thin wire)
Now the sporadic firing problem is likely to do with the different sector gear...
It is possible the the optical sensor is not picking all the teeth on the 13:1 sector
be it being jet black, chunkier teeth or just needs to unit shifted a fine minor smidge one way
could be grease on senor, sector rubbing, to do with light not picking up all the teeth
(so cycles another once or twice coz it only read say 14 teeth not 16 if full sector gear)
Also with optical units the gun can be made to cycle if light enters the box
often people go to test a box with box & grip/motor & light enters that tiny pin by trigger
and can make some optical units go nutz & confused & calibration difficult
even then if hold gun upside down towards sun on a sunny day
or shine a bight light at trigger, the light can enter box and cause gun to fire all by itself
yes - optical units can be prone to the odd issues of the sensors incorrectly detecting stuff
I doubt if the colour of the sector really makes much difference, it works by the teeth breaking the beam 16
or whatever it calibrates the gun/sector as...
So most likely the different sector is ever so slightly different, a whisker out of wack picking up varying teeth
so likely need to loosen unit, shift it to right/left slightly & retest if all teeth detect properly
One thing to try is pull the trigger only what it is needed - don't pull it ALLLLLL the way, just enough to fire
as the Perun on ultra full trigger pull can fire, but trigger goes beyond the range of sensor(s) so think trigger is reset
when in fact it has travelled too far on max pull, so that when you release it, it comes back across the sensors
and thinks it is another pull when in fact it is resetting to rest - so gun gets very confused & fires sporadically
on the 516 box there is a casting where you can easily add material to limit the final trigger pull
alas on the 621 box it is not reinforced and doesn't have this material to easily half trigger travel
so alternative method or proper adjustable speed trigger/mod might be needed
but before you do owt shiting unit about, test on half trigger pulls if gun is sporadic (trigger sensor issue)
or if no joy then likely shift unit about to improved the sector sensor detection issue
hope some of this helps
,did tag him so just waiting on his response see what he susggests aswell before i end up putting the gun to a tech next week lol
