USPA Glock 19 slide and barrel

Anyone every hear of them ? Any good ? I'm considering to finish an 80% lower project but not sure if they are quality.

https://s19.postimg.org/5t1yjl777/US...and_Barrel.jpg

GLOCK 19 USPA SLIDE STAINLESS STEEL BLACK New Complete Built Upper For Glock 19 9mm Stainless Steel Slide Cerakote ... --New Slide For Glock 19 9mm Gen3 Slide G19 416 Stainless Steel --Heat Treated 416 Stainless Steel --Fits Glock Gen 1-3 --Fits Polymer80 Frames --Front & Rear Sight Cuts --Front And Rear Serrations --Glock Sights Installed On Slide --Barrel Black Nitride --Parts Kit FIRING PIN SPRING (US manufactured --FIRING PIN SPACER SLEEVE (US manufactured) --SPRING CUPS (2-PACK) (US manufacture) --FIRING PIN SAFETY NITRIDE (US manufactured) --FIRING PIN SAFETY SPRING (US manufactured) --EXTRACTOR DEPRESSOR PLUNGER NITRIDE (US manufactured) --EXTRACTOR DEPRESSOR PLUNGER SPRING (US manufactured) --SPRING LOADED BEARING (US manufactured) --FIRING PIN CHANNEL LINER (US manufactured) --EXTRACTOR – (US manufactured) --SLIDE COVER PLATE, METAL LINED (Glock)