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ILLusion, the main issue with their(ProG4/Airsoft Surgeon)'s older design is the absence of a lug on the left side, where your new lug is. Looking at both the Nova and SD slide they all have an substantial lug on that side contacting the left side of the chamber. Whereas on the ProG4 slide it is just a raise portion with some chamfering. Which I think makes a lot of sense considering how the Marui chambers are cut and you can get a lot more material built into the back side then the ejection port side. Maybe in their goal to make lighter slide they sacrificed that...
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