i curently have a ms700 and msr700 (both are tx system so same parts)
my msr was bought used and had the same slam fire problems
one of the important thing for the ares triggers, you do have to pull the trigger all the way back so the roller clears the sear correctly
gigi at ares told me to go through there HK reseller (saleswargamegearhk@gmail.com) to get the parts to change the sear (btw, you can now get 90 degrees sear) and my m700 came with 90 degrees sear and piston
my msr is now converted to mancraft sdik system and my m700 is on pdi system
on the pdi, they have the specific parts for tx system so if you change your sear, you can get it to a 90 degrees at the same time
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