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The rubber tube nub is basically a rubber tube cut into the length of a nub. Because it is made out of rubber, it is soft and squishy.
My experience with the rubber tube nub comes from the Echo1 Red Star IGOR VSS Vintorez, whuch comes with the Mad Bull bucking. The rubber tube nub does not seem very consistent at all. The VSS has a sliding version 3 hop-up unit. With the hop-up at the lowest setting, the gun seems to shoot straight to 100 feet. So that is where I sight the red dot sight to. I would put the gun on the shelf for a week or two. The BB would drop to the ground at 50 feet. I would slide the hop-up back and forth a few times. The I would set it to the lowest setting. All of a sudden, the gun would shoot straight again. I have never seen this kind of inconsistency with the plastic H-type nub (see below).
The H-type is a cylindrical nub carved into an hourglass-like shape. The final result is a nub that looks cylindrical from the side, but looks like a 'H' from the front and back.
The plastic H-type hop-up nubs came with all my APS M4 airsoft guns--APS Mini Patriot M4 and APS M4 URX Raptor. These guns shoot extremely precise with this nub. I only had to adjust the hop-up once and sight it in with my red dot. I never had to adjust it again. So far, I am a firm believer of the H-type nub.
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