Update on Flamingo buckings:
Needs a the Laylax hop unit to work really. The stock Marui unit just pushes down on the first part of the contact patch, and not the whole area, regardless of nub.
How ever, What I can tell you these do fit the stock Marui barrels. I've fit one to my HK45 with a H plate, and it shoots just as good as the mod tan currently. Ill range test it at the field Sunday