AAR on FN510T:
Ran 54 rds of full power ammo (1250-1300fps. Pulled 180gr FMJ w/ 9 gr LS, CCI 350 and CBC once fired brass).
About as snappy as a G20
Mags were a bitch to load and cartridge OAL is something to watch for (my reloads are ~1.26", some tolerance). Dry lube might help or just breaking them in. Nothing like your normal G20 mags tho. Round #21 and 22 particularly sucked to push in.
Accuracy was there. I couldn't tell the difference between the stock trigger on my spare 509T either. Would benefit from an APEX.
I think a gas comp is in order. A suppressor would work too. Overall very pleased. Not as pleased as I'd be if it was an FNX10T. My FNX45T was a pussycat next to this and more fun to shoot honestly.
Barrel is fully supported by the way, no bulges noted.