Gen 2 Standard Device for Mossberg Shockwave 12 gauge.This "Pumkin Puncher" is an extremely effective device that will give you a standoff / breaching option as well as an aggressive, non-lethal deterrent at an affordable price, by simply attaching to your standard Mossberg tube cap as shown in pics.Measured from the base of your cap, to the tips of the teeth, will be approximately 2.815" of length. This makes it compatible with other Mossberg 590 models with equal, or close to, muzzle to cap ratios. This Puncher is machined from 6061 aluminum, and as such, machining marks may be present. It is anodized flat black and branded.What you’ll receive:The stated device, instructions, all necessary machine screws, washers, allen screws and hex wrenches for your specific item along with a pack of VC-3 thread lock. You will need a phillips screwdriver and a 3/8” socket or similar. A very easy install.This is an extremely cost effective and versatile option you can easily add to your shotgun.Free shipping to the continental U.S.A. only.Please read the entire listing, do the math and ask any questions before purchasing. Questions will be answered ASAP.Please message for more pics or a mockup. NO WARRANTY EXPRESSED OR IMPLIED. BUYER ASSUMES ALL RISKS INVOLVED WITH USE OF THIS ITEM. “U.S. Pat. No. 9,291,418”