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In case anyone is considering an extended barrel to try increasing fps, the barrel is a simple tube held in place by a rubber bushing at each end. I measured the OD as 0.2355”, so it is most likely specified as 6 mm. An extended barrel would just take finding another BB gun with a longer barrel...

HPA seems like the way to go. I’d just like to see more information on what kind of results to expect before I order a bunch of stuff. I thought adding preload to the hammer spring might be something inexpensive to try while I consider my options.

FuzzyGrub, Great post! I’ve seen references to the parts list, but this is the first time I have seen the diagram to go with it. Nice bonus with the discount code too! I have read that shimming the hammer spring might become necessary at higher pressures to avoid valve lock, but I thought it...

Joey, you appear to have one of the few performance builds out there. Were you getting close to 1000 fps at 1100 psi? It looks like you went up to 1800 psi after your original post, so I am curious what the performance is like now. In your experience, would there be any benefit to shimming the...