I've said it before and I'll say it again: The KJ is, imo, the best overall GBBR on the market. And there ARE upgrade parts for it.. in mine I have the RAtech blue hopup rubber and the Cradle V3+ (the cnc aluminum) bolt with velocity reducer. The gun is also compatible with most aeg front end sets. But that is really getting into aesthetics. Functionally, everything important is either good to go OOTB or has the part available.
Sorry that the above wasn't the most well-thought out message.. but can you tell I love my KJ M4? lol
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