I too have the 550 and regard this as one of the nicest setups out there. Their customer service is EXCELLENT! I have different setups that I just slide in for 40,45 and 223. It take me a while to find a the dimensions that will work with each specific pistol or rifle and so once I find it I measure, lock it and leave it alone and just reload. I will check dimensions frequently for quality control and have been very please by this equipment. Good luck...
TR
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TR
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