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"spin nub"? The Marui GBB system does not use nubs like AEG's do. The pressure is applied via an adjustment armature. If you're looking for that, I have upgraded ILLusion Kinetics arms available, but I do not know if it will fit your gun. Again, I'd have to see your part to see if they're compatible. Unfortunately, I have no experience with the Tanfolgio, but have been interested in seeing this pistol.
If you don't want hop up at all, I would actually recommend a no-hop system. I have one such assembly in stock. They're typically harder to find, since they're not that popular, but they are amazing for shooting steel at close range. They give much tighter groupings when compared to a system with hop up. The limit for these is 10 yards till the drops start to arc downwards, so your 6 yard requirement should be more than sufficient for the capability of these barrels. Usable range would be increased if your power source is stronger.
This no-hop barrel assembly is integrated with a high quality electroplated 6.03mm tightbore inner barrel. However, the length of this barrel is 103.5mm (Hi-Capa 5.1 length). I don't know what the length of your Tanfoglio inner barrel is.... from what I understand about that gun, it uses a 5" barrel, just like the 1911/Hi-Cap series, so I think this no-hop inner barrel that I have here should fit your application.
If you want to skip that and just go with a classic hop up rubber + tightbore combo, there are plenty available... hit me by PM if you want to talk more about what I have in stock.
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