Long story short, my baby is a Tokyo Marui G-Spec rifle. Out of the box, it had a hop issue. Instead of pursuing an item return I made the decision to upgrade. Thus the madness began. I started out with the PDI hop chamber and bucking. That hop set up allows u to use an AEG cut inner barrel so I promptly dropped $100 plus on an ORGA 6.23 barrel as those have been getting some truly spectacular results in testing, tho untried in a spring rifle. Less then 50 shots later, the bucking tore. Research (that should've happened in the first place ) was done. The PDI hop is not compatible with the stock Marui cylinder set, only PDI's. So, a few months of saving, PDI palsinite HD cylinder set, and replacement Prometheus bucking later, I had an again working rifle. Less then 20 shots later, another torn bucking. Following one more replacement bucking and a full look over, it tore another bucking in 7 shots. It hangs on the wall again, over a thousand dollars invested. All parts and labor have been professionally installed/performed by the tech's at AMPed Airsoft. If anyone has encountered and resolved this issue before, please post or PM how u managed as I am vexed. Any reasoble suggestions are welcome. It has been over a year struggle, for further details just message me. All relevant details have been told. Good day, gentleman. I look forward to your expertise and assistance.