Upgrade for a we m4 open bolt
 

hi guys ive just got my hand on a brand new gen 2 we m4 open bolt cqb and i was wondering wich upgrades you guys did done to yours and wich you think its a must have to get the perfect and reliable rifle thanks

Run it on stock internals until something breaks, install an NPAS asap. I wouldnt run anything under .30 Match Grade BB's

RAtech M4 trigger box, NPAS, steel bolt is a nice thing to have but not necessary in the least
and Id reccomend getting a maple leaf monster bucking or an A+ Reaps (vsr type)

I agree with what was said above. If you start adding steel trigger sets or bolt etc, then you need to do the whole thing or you'll run into problems later.

So NPAS (an absolute must), maybe a heavier buffer; you can also put in a better hopup rubber (wide choice of TM Hi-Capa/VSR10 buckings to choose from), hopup spacer (again, different people have different preferences: it'll depend on the bucking, too. AEG buckings work.) Maybe an inner barrel.

You can buy two RA-TECH Part, Steel Bolt Set & Trigger Box.
http://www.tokyo-model.com.hk/shop/b...ge.340x283.jpg
http://www.tokyo-model.com.hk/shop/b...ge.340x283.jpg

Trigger box likes to runaway on semi, and that aluminium nozzle is inconsistent and destroys the hopup chamber.