Can't help but mention that auto-loading shotguns aren't typically the best choice for home defense. In a dynamic situation, the ability to forcefully rack a round in and rack it back out gives the pump a significant advantage. And if it's speed you're after, practice with a good pump gun can achieve reload speeds comparable to that of auto's, while also requiring that you think about what you're doing, instead of blazing away during the self-removed tunnel vision stages of acute quantities of adrenaline rushing through your veins.
The mere sound of a pump gun being racked is often enough to reppell the most vicarious assailant.
Mine is a Remington 870 Express 12 guage w/ reciever accepting up to 3" magnum shells. 18 1/2" barrel, Choate tactical single-piece pistol grip buttstock, Vang-comp tactical dome safety, Vang-comp 6 round side saddle with through-bolt hex's, not slip-fit pins. High vis polymer follower, wilson combat 2 round extension and wilson combat swivel sling mounts.
Between 7 rounds internal, 6 side saddled and one in the pipe it'll hold 14 rounds total. In the mag tube I keep 6 00Buck shells, then in the side saddle 3 each of 1oz slugs and less-lethal rubber rounds.
Took several years to get it this far but it's a beautifull system
