"Statements are made that the shotgun or pistol should be used because of the over-penetration problem with 5.56 carbine ammunition. This could not be further from the truth. If you conduct a little research you will find that numerous law enforcement departments, to include the FBI, have proven this to be false in most cases. The fact of the matter is that many of these bullets will penetrate numerous walls, but standard 5.56 loadings are the least of your worries when compared to pistol and shotgun fodder, which continue to take top honors in the category of over-penetration." US Army Sergeant Major Lamb (former Delta/CAG)
https://www.americanrifleman.org/art...xperts-opinion
"Common pistol rounds easily penetrated all 4 walls spaced out at room distances. This is a critical issue. Think about the inside of your house and imagine if you shot through 4 walls. Could you hit a loved one? Know your target and what is behind it....The 5.56 rounds deviated greatly from the original flight path once they started tumbling. This occurred after the second wall." Old_Painless (certified Pistol, Rifle, Shotgun, Personal Firearms Defense, and Home Firearms Safety Instructor)
http://www.theboxotruth.com/the-box-...sulated-walls/
"Proponents of the pistol for home defense like to think that because it’s 'just' a pistol round, overpenetration really won’t be an issue. Such is not the case. Drywall sheets and hollow-core doors (which are what you’ll find in the majority of homes and apartments in this country) offer almost no resistance to bullets....For years many people just assumed they knew what would happen to a rifle bullet fired indoors—it would go through every wall available and then exit the building. While armor-piercing and FMJ ammunition is specifically designed to do this, extensive testing has shown that light, extremely fast-moving .223 projectiles (including FMJs) often fragment when they hit a barrier as soft as thin plywood." James Tarr (former police officer; contributing editor for Guns and Ammo)
http://www.gunsandammo.com/ammo/long...fense-caliber/
"The .223/5.56 is moving at around 3,000 feet per second, and while it isn’t magic bullet, it’s a far cry better than any pistol round. Another advantage of the .223/5.56 is its limited penetration. The shape and velocity of the round cause it to immediately expend or dissipate its energy once it strikes something." Tiger McKee (adjunct instructor at Thunder Ranch)
https://gundigest.com/reviews/ar-15-...e-defense-guns
"The pistol rounds were seemingly unaffected by the drywall and/or wood barriers. There was no observable deviation or fragmentation of the 9mm projectiles. You’d be safe counting on a pistol round to keep going, and going, and going. After all, premium pistol ammunition is designed to expand, and lose energy, when striking liquid-based targets—not walls. The full metal jacket .223 rounds tended to tumble rather than break apart when they encountered barriers." Tom McHale (contributor at AmmoLand and OutdoorHub)
http://www.outdoorhub.com/stories/20...ration-issues/
"FBI and Independent Testing Has Consistently Shown .223/5.56 NATO Fired From AR-15’s Do Not Over Penetrate More Than Pistol/Shotgun." Caleb Lee (NRA Certified Basic Pistol & Personal Protection Inside The Home Instructor)
http://preparedgunowners.com/2016/07...ation-testing/
"Since all of the 5.56 mm/.223 bullets fired through the interior wall had significantly less penetration than 9 mm, .40 S&W, .45 ACP, and 12 ga. shotgun projectiles which were fired through an interior wall, stray 5.56 mm/.223 bullets seem to offer a reduced risk of injuring innocent bystanders and an inherent reduced risk of civil litigation in situations where bullets miss their intended target and enter or exit structures. As such, 5.56mm/.223 caliber weapons may be safer to use in CQB situations and crowded urban environments than service caliber handguns or 12 ga. weapons." Dr. Gary Williams (ballistics expert)
http://www.recoilweb.com/ar-vs-shotg...#ixzz4zCOCPykZ
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