I carry a Remington 870 with 18.5" barrel and pistol grip. this is loaded with 3" magnum slugs. If you plan on using this to save your life you'd better practice shooting slugs. It took me awile to get accurate with the pistol grip. I shoot skeet for practice. The first time I shot a slug I missed the 20" dia. log that was 10 feet away from me 3 times.