PCC for home defense vs AR-15?

Question

I live in a townhouse. I've been reading about PCCs and they seem like they'd be less loud, less blast indoors, less penetration through walls. Is a 9mm PCC actually a better home-defense choice than an AR-15, or is this an internet argument that doesn't hold up? I'm a new-ish shooter, mostly pistol experience so far.

Renata Silva · Accepted Answer

This is a good question and it is an internet argument that mostly doesn't hold up the way it gets stated. Let me break it apart.

**On noise and blast indoors:** Yes, a 9mm PCC is quieter and has less muzzle blast than a 16" 5.56 AR — particularly an unsuppressed 5.56 carbine. But "less" is doing a lot of work there. Both are hearing-damaging indoors. If indoor noise is your concern, the real answer is a suppressor (on either platform). Unsuppressed indoor firing of a centerfire rifle is going to permanently damage your hearing regardless of caliber.

**On wall penetration:** This is the argument I see most often and it's mostly wrong. Modern 5.56 defensive ammunition (55gr or 62gr soft-point, Hornady TAP, Federal Tactical Bonded) actually penetrates drywall about the same as or less than 9mm FMJ, because the 5.56 projectile destabilizes on impact and breaks up. A 9mm hollowpoint will also shed velocity through drywall, so it's mostly a wash between them. Where you do see real differences is with 5.56 FMJ/ball ammunition vs 9mm defensive — ball through drywall is a lot. Defensive ammo vs defensive ammo, they're comparable.

**What actually matters for indoor defensive shooting:** training, sight picture, and trigger press under stress. You will get more out of being confident with your platform than you will get out of "optimizing" caliber for indoor use.

**Given you're mostly pistol-experienced:** A 9mm PCC is genuinely a great choice for you. It shares magazines with many pistols (if you choose a compatible platform), has lower recoil, and is easier to transition to from a handgun background. The AR-15 is also fine, but the learning curve is longer.

**My recommendation:** 9mm PCC that takes Glock magazines (Foxtrot Mike FM-9, CMMG Resolute MK17, Sig MPX) if you own or plan to own a Glock pistol. Home defense ammunition (Speer Gold Dot, Federal HST) in a 25-round magazine. Weapon light. Sling. And you're set, with a platform you'll shoot better faster than a 5.56 carbine.