I am the owner of SBE Precision products located in Southern California. We design and manufacture very high quality components for several brands, of shotguns, Pistols, and rifles. We have been producing several components for the Mossberg 930, and Mossberg 500 shotguns. Mossberg 930 Stainless Steel Competition Piston: If you shoot your 930 a lot this will literally change the way you look at your shotgun. Cleaning intervals can be increased to well over 1000 shells without any loss of performance or reliability. This piston used only the 930 outer piston ring, and replaces the inner ring with grooves. The result is carbon, and deposits being ejected into the forend instead of staying in the gas system. The photo below is a 2000 shell test done by a competition shooter over the course of several months (he shoots a lot). http://sbeprecision.com/product/sta...on-piston-for-mossberg-930-ring-not-included/ Mossberg 930 High visibility follower. These followers are CNC machined from 6061-T6 Aluminum and finished in a bright orange anodize with Teflon seal. The result is a great visual indication of empty magazine tube as well as tactile indication by feeling for the hole in the face of the follower. The follower has a tail to prevent spring kinking, and a machines spring pocket groove prevents open ended (nordic) springs from scraping the inside of the magazine tube. .http://sbeprecision.com/product/mossberg-930-comp-tac-12-gauge-aluminum-alloy-follower/ Plus One Nordic Endcap: This is an excellent addition to any JM PRO or SPX that uses Nordic extensions. This cap will add a plus one capacity to the JM Pro for a full 10 shells in the tube. On athe SPX with 2 shot extension it will bring capacity back to 7 and be flush with the muzzle. http://sbeprecision.com/product/plus-one-extension-tube-endcap-for-nordic-mxt/ We are currently working on some other Mossberg 930 internals that are common failure points for the shotgun so stay tuned.