[Jackarutu]

Greenpunk, you may be 100% correct because after lubing it with water didn’t work my second step was to use silicone lube and if you’re correct all that accomplished was to exacerbate the problem.

I haven't tired other rubbers yet because I wanted to give it a good try out as packaged from Madbull to see if that blue rubber actually offers any improvement. I’m not aware of any other rubber that has that extra thickness (bump) where the bucking nub makes contact with the rubber.

Until now on my custom builds I have been using the Echo1 one piece metal hopup with the Element 45 Hard hopup rubber and they slide into place very easy when using a MB IB.

When comparing the rubber that comes with the MB hopup to the Madbull Item # R860 60 degree rubber they don’t have the extra bump even thought they are blue. They are not the same rubber that comes with the Madbull Ultimate hopup.