Drew, can you grab a measurement off that little monster for me? I'm trying to find out what it's max height over the rail is, mounted but folded down - I need to find a rear sight that is going to clear a rail-mounted scope at the back. That would be much appreciated, man, as I don't think the Magpul MBUS is gonna clear. <thumbsup> Depends on whether you want to use any of your previous shooting (pre-free float) in the match ammo comparisons. If you want to use that stuff, keep the rifle the same. Whatever you come up with in the match ammo discoveries will only get better once the FF tube is on there. However, if you're using none of the previous range time, install the tube now and it'll have whatever effect it has, on the match comparo. That's the route I'd take, anyway... ;D Friday, UPS says they're giving me this - Wilson/Nordic 16" midlength barrel, 1/8 twist, .223 Wylde chamber. They were supposed to be giving me this, too, but the beast was outta stock... Shotgun barrel clamp with pic rail...