So I just completed my FOC Briuticus (retail version), and I had an issue with brute's gun combo as shown in the instructions. Brawl's gun just wouldn't stay securely in Swindle's barrel (probably due to the loss of the extra paint apps). Anyway, I played around with the combo a little bit and I think I may have discovered how the designers "intended" the guns to combine. Anyway, after searching through the boards and several youtube videos, I didn't see this [exact] configuration anywhere (they were similar, just the swords were alligned vertically, not horizontally), so I thought I'd share. If you see the attached pics, there is a line detail that extends from Blast Off's guns onto Vortex's swords, and Vortex's swords actually plug into the slot on top of Brawl's gun. The connection is very secure, and I don't have any problems with the gun falling off any more. It also still can attach on top of Onslaught's gun, although there are some slight clearance issues due to the handles on BO's guns. Hope that helps!