So this will be my second WE M4 build using the open bolt system. Parts are still coming in, but here are some teaser pics of what I have so far. I have a second steel RA tech open bolt ready (pic below) for this build and several furniture such as takedown pins/springs, magazine catch, safety selector, stock tube, etc.
On a side note, I can also attest that
ALL the old closed bolt trigger components function with the new open bolt system EXCEPT for the auto sear and bolt catch. Both of which are extremely easy to mod, even a monkey can do it. Although the closed bolt fire pin delay and trigger box looks different than their counterparts found in the open bolt system, they can still be used with the open bolt system without any issues. This means that if you have your RA-tech steel upgrades from your closed bolt system, you can transfer them directly to your open bolt build. I tried it, done it, and it works
