And yes, I am 100% serious about this.
No, not the New Agent--the other one.
PSA lower, DD LPK, PWS buffer system...DD upper, DD 11.5" lightweight barrel, 10" Troy TRX Extreme, Bushnell Holosight, Surefire G2L on a Safariland mount. YHM Phantom flash hider (Think I'm going to put a flaming pig on it, though...).
It's easily shot from the shoulder like a rifle. It controls like a rifle. It can be shot to minute of silhouette at 10 yards with one hand...or can be put to the shoulder to make hits out to 100 yards with ease (not that I'd have that kind of range indoors, but I alsolive in a rural area...one just never knows).
It's short and maneuverable. Not that I advocate moving through the house for clearing, if it had to be done, it would beat a 18" shotgun. As pictured, 30rds of 5.56 77gr OTM on tap, with a Surefire 60-rd mag for backup.
Best of all, it fits in a drawer in the bedroom.