I have no issues with it in a stock CA metal body. I noticed that the rubber was not flush when I installed it so I just used a pair of tweezers to straighten it out.
best to use the MB rubber and tight bore barrel for best fitment. I originally had the guarder clear in with a MB TBB, but found the tolerances too great causing the rubber to 'flap' a bit on every shot and it eventually tore the lips. swapped in the MB blue rubber and all is good. also using the SCS bucking instead of the standard one that comes with it.
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