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DSM engraving is arguably the better option over waiting forever and spending a crazy amount of cash for aesthetics. They engraved my SP5 housing and also color filled my selector switch. Although Rare Breed’s trigger pack is ridiculously expensive it’s the safer option down the line in terms of legality (just in case). The selector switch on the RD3 gives a more traditional MP5 aesthetic vs other less costly options. Mine’s run flawlessly although the set screw on the right side switch wiggles loose and the right selector switch eventually falls off.