We need more pressure! The APFG XM7's window of adjustment for the hop unit is infamously narrow and on lower power setups, 1.2j and below, users are finding the hop unit maxes out on pressure for around .3s/.32s (Bucking dependant). Our High Pressure nub aims to move that adjustment window with a higher rear shelf to allow the use of heavier bbs such as .32s-.4s, depending on which bucking you use. These are not aimed to be a flat "Performance upgrade", this part is more for fine tuning of the restrictive hop unit that comes with the XM7. We recommend pairing this with the Crimson bucking for optimal results.