Nice mod danielsilva, with this mod i no longer have bb´s hooking to sides and no shaved bb´s accumulating in the lower reciever and no more rod jamming in the brass tube.
Who would imagine that such a simple mod would do so much for this rifle.
About the open bolt system, imo, i don´t see why there would be a necessity to change the trigger group since it is only related to the magazine, in the way the firing pin hits the gas release valve.
Sure that the magazine lip should be differente and need to be replaced for the open bolt system and the hop-up group to, but to redisign a lower trig