[Bar1975]

I picked up a used WE M4 Open Bolt that had a cracked nozzle (the crown was broken from a BB Jam)

i replaced the nozzle with a new one and within a mag or two the same thing happened again. I broke a brand new air nozzle.

The gun will now consistently jam every other mag and it results in the mag expelling all gas and me having to remove a jammed BB .. mashed into the hop up unit.

I've taken everything apart and cleaned/lubed the entire bolt assembly. The path of the bolt to the BB.. to the hop up unit is clear and aligned. When i pull back the bolt with a loaded mag in the gun and slowly allow the bolt to move forward i can see that the nozzle feed arm is hitting the BB fine and 'should' be chambering the round but it seems to pick it up from the Mag and just throw it around the breech.. only sometimes the BB makes it's way into the hop up unit itself. (I've read that the nozzle crown is purely cosmetic but I've also read that it's used to help chamber the BB? Is this true?)

I have exhausted all options here.. i am ready to replace the entire bolt/hop up assembly with new steel parts. One thing i've noticed is the bolt itself has a rather large indent where the hammer engages with the bolt.. Would this indent in the bolt cause the bolt assembly to be off enough to cause consistent bb jams?

should i just buy a WE Open bolt kit and replace everything with WE stock parts or make the investment is steel upgrade parts?