This is a Grayguns P320 Modern Classic Slide, 4.7” Bull Barrel. This is a complete slide with the bull barrel that makes a drastic difference in recoil & is direct cut for the DPP footprint which fits the new Vortex Defender XL's perfectly (optic not included). I thought these things were a gimmick as they sell for $950 new but they are noticeably better than a standard X5 legion. The balance on these guns with a tungsten grip is just phenomenal. I just ended up grabbing too many at once so I'm letting go of one of them. *Note that the frame and FCU are not included*

https://grayguns.com/product/p320-modern-classic-slide-4-7-bull-barrel/