lol - no worries - yeah, Freak Backs, and Deadly Wind Fibur barrels have internal orings that hold the insert in place. So the insert drops out of the UL and other custom milled backs, perfectly normal.
Typically if whoever mills it correctly, the insert will fit, exactly flush, and maybe 1/32 out, so as you tighten the barrel on the marker, (Oring on the barrel ofcourse - so you dont crush the insert) the pressure holds the Freak Insert in place.
Hope this helps....
My Current Markers:
(Exclusively Using Monkey Poo Lube
/ Gun Sav Lube
MacDev Clone GT
Black/Green = Ninja Air 550psi 70/4500 = Seed Rotor
Black/Green (Pooty51 Polished NDZ Can/BubbleGum Flat Face Bolt) = Ninja Air 550psi 70/4500 = Seed Rotor
Black/Green = Ninja 550psi Reg'd Crossfire 70/4500 = Seed Rotor
DigiCam Midnight (Virtue OLED) = Ninja Air 68/4500 = Seed Rotor
Midnight = Ninja Air 68/4500 = Seed Rotor
Champagne (Pooty51 Polished Bolt / Virtue OLED) = Ninja Reg'd CrossFire 70/4500 = Seed Rotor
. . BattleField Orlando