Physsec Firearms Mechanics Safety And Carry

---
name: physsec-firearms-mechanics-safety-and-carry
description: "Use when a firearms question is conceptual, about safety and storage, or about owning and carrying responsibly — the cartridge and the action types at a conceptual level, wound ballistics stated honestly (no knockdown power, shot placement and penetration over caliber, over-penetration), the four universal safety rules, storage options from on-body carry to off-site, the honest risk ledger (the contested defensive-gun-use numbers against the suicide evidence, temporary off-site storage in a crisis, 988), choosing a defensive handgun, carry equipment, the training pathway, the home-defense plan, police encounters while armed, and what to do after a defensive incident. Conceptual and safety material only, as the source gives it. Skill 4 of 8 of the Physical Security, Self-Defense, Firearms and the ATF Substances reference."
---

# Firearms: How They Work, Safety and Storage, Choosing, Training and Carrying

> **Skill 4 of 8** of the *Physical Security, Self-Defense, Firearms, and the "ATF Substances"* reference
> (plugin `physical-security-self-defense-and-firearms`), carrying the first half of source Part V, *Firearms*: §14–§16 — how firearms work (conceptual), safety, storage and the risk ledger, choosing, training and carrying. Sibling skills:
> `physsec-foundations-and-threat-modeling` (§0–§4 — how to read the reference, threat modeling, the security mindset, layered defense and CPTED),
> `physsec-securing-buildings` (§5–§8 — homes, home hardening, organizations and commercial buildings, and targeted violence),
> `physsec-personal-security-and-self-defense` (§9–§13 — personal security, the self-defense hierarchy, training evidence, less-lethal tools and Stop the Bleed),
> `physsec-firearms-and-self-defense-law` (§17–§18 — federal firearms law and South Carolina carry and self-defense law, as of September 2026),
> `physsec-alcohol-tobacco-and-cannabis` (§19–§23 — cannabis, alcohol and tobacco/nicotine on mechanism, medicine, harms, law and self-defense),
> `physsec-decision-tools-and-contested-questions` (§24–§26 and Part VIII — the personal security plan, spending priorities, the organizational checklist and the contested questions),
> `physsec-reference` (§27–§30 — training and references, the glossary, the currency notes and the sources).
>
> Section numbers are **the source's own and shared across the whole set**: a reference written
> as §N → `skill` points into that sibling skill.

> **Read this first — the source's own limits and tags** (in full at §0 →
> `physsec-foundations-and-threat-modeling`). **Not legal advice** (self-defense law is
> fact-specific and South Carolina case law is detailed — talk to a criminal-defense attorney
> before you need one). **Not medical advice** (no dosing, no regimens). **Not a substitute for
> hands-on training** — firearms handling, medical skills and physical self-defense cannot be
> learned from text. Evidence tags: **\[STRONG\]** replicated, large-sample, or randomized
> evidence; professional consensus · **\[MODERATE\]** consistent observational evidence;
> plausible mechanism · **\[WEAK\]** self-report surveys, small or industry-funded studies,
> expert opinion · **\[CONTESTED\]** serious researchers disagree; both positions presented ·
> **\[LAW-2026\]** legal state as of Sept 2026; verify before relying on it. The source was
> compiled on September 30, 2026 and has not been re-checked for this pack; what will go stale
> first is listed at §29 → `physsec-reference`.

> **If anyone in the household is in crisis**, the source's own list (§27 → `physsec-reference`):
> the **988** Suicide & Crisis Lifeline; the National DV Hotline **1-800-799-7233**; the SAMHSA
> National Helpline **1-800-662-4357**.

> **Pack orientation** (the pack's words, not the source's): The first three sections of Part V. This material is **conceptual and safety-oriented**, as
> the source gives it: how firearms work in outline, the safety rules, storage and the risk
> ledger, and choosing, training and carrying. It adds nothing below the source's own level
> of detail. The law is §17–§18 → `physsec-firearms-and-self-defense-law`; the South Carolina
> law this skill does state — §16's police encounters while armed — is tagged \[LAW-2026\].

## §14 How firearms work (conceptual)

**The cartridge** is four parts: a **case**, a **primer** (impact-sensitive compound), a **propellant** charge (burns rapidly, producing gas), and a **projectile** (bullet or shot). The firing pin strikes the primer → primer ignites propellant → expanding gas drives the bullet down the rifled barrel, which spins it for stability.

**Action types:**

- **Revolver** — rotating cylinder; simple to operate, limited capacity, slower reload.
- **Semi-automatic pistol** — recoil energy cycles the slide, ejects the spent case and chambers the next round; one shot per trigger pull. The dominant defensive handgun.
- **Rifles/carbines** — bolt, lever, pump or semi-automatic; greater accuracy and energy, harder to maneuver indoors.
- **Shotguns** — fire multiple pellets or a single slug; pump or semi-auto; powerful but heavy recoil and manual of arms complexity.
- **Fully automatic** — tightly restricted under the NFA and essentially unavailable to civilians.

**Wound ballistics, stated honestly.** There is no "knockdown power" — bullets don't throw people. Handgun wounds incapacitate by **damaging the central nervous system or causing enough blood loss** to drop blood pressure; the latter takes time, and people can keep acting for seconds to minutes after lethal wounds. Consequences: **shot placement and penetration** matter far more than caliber; defensive handguns are chosen for controllability and reliability; modern expanding (hollow-point) defensive ammunition is standard because it penetrates adequately while reducing over-penetration. The FBI's 2014 shift back to 9mm reflected improved bullet design and better hit rates. **\[STRONG — forensic consensus\]**

**Over-penetration**: common interior walls stop almost nothing. Know what's behind your target — in a home that means family bedrooms and neighbors.

## §15 Safety, storage, and the honest risk ledger

**The four universal rules:**

1. Treat every gun as if it's loaded.
2. Never point the muzzle at anything you aren't willing to destroy.
3. Keep your finger off the trigger until your sights are on target and you've decided to shoot.
4. Be sure of your target and what's beyond it.

**Storage options, from fastest-access to most secure:** on-body carry → quick-access biometric/keypad lockbox → locked safe → cable/trigger locks with ammunition stored separately → off-site storage. **A gun that's not on your body or in a locked container is unsecured.** Many stolen guns come from cars; use a vehicle lockbox cabled to the frame.

**The risk ledger — both sides, as honestly as the evidence allows:**

*The defensive benefit side.* Defensive gun uses (DGUs) happen, but their frequency is one of the most contested numbers in criminology. **\[CONTESTED\]**

- The National Crime Victimization Survey implies roughly **61,000–65,000 firearm defenses per year** (1987–2021).
- Kleck & Gertz's 1990s survey estimated **2.1–2.5 million per year**; a 2021 online survey of gun owners produced a figure in the same high range.
- The gap comes from definitions, survey design, false-positive bias in rare-event surveys, and under-reporting in the NCVS. RAND's systematic review concludes that research on how gun policies affect DGUs is essentially **inconclusive**, and that DGU research overall is thin.

*The risk side.* **\[STRONG\]**

- **Suicide is the majority of US gun deaths (62% in 2024)**, and the share rises steeply with age — over 80% of gun deaths among people 55 and older.
- The largest cohort study to date (Studdert et al., *NEJM* 2020; 26.3 million Californians): **handgun owners had several-fold higher suicide rates** than non-owners — driven entirely by firearm suicides, highest right after acquisition, and persisting for years. Firearm suicide attempts are far more lethal than most other methods, and many suicidal crises are brief.
- A 2025 case-control study found locked storage strongly associated with lower odds of firearm suicide among **adolescents**, but not among adult men — implying that for adults in crisis, **reducing access (temporary off-site storage)** matters more than lock type.

*Practical synthesis:* If you own firearms for defense, the evidence supports (1) locked storage whenever the gun isn't on your body, especially with minors in the home; (2) a pre-agreed **temporary off-site storage plan** (trusted friend, FFL, some ranges) that you would use if anyone in the household — including you — is in crisis, because acute crises pass and access is the modifiable variable; (3) the 988 Suicide & Crisis Lifeline exists for anyone in the household. Note: transfers to another person must still comply with federal and state law — ask the FFL or an attorney how to do a temporary transfer lawfully.

## §16 Choosing, training, carrying

**Choosing a defensive handgun:** fit to your hand, controllable recoil, reliability (proven models), sights you can see (many now use red-dot optics), a trigger you can press without disturbing the sights, and a size you'll actually carry. Rent before buying. For home-only defense, a pistol-caliber carbine or a light shotgun/rifle offers easier hits but more complexity; trade-offs include maneuverability in hallways, over-penetration, and noise.

**Carry equipment:** a rigid holster that **fully covers the trigger guard** is non-negotiable; a sturdy belt; retention for open carry. Pocket carry only in a pocket holster. Never carry loose in a bag or waistband.

**Training pathway (suggested sequence):**

1. Basic safety and marksmanship (NRA Basic Pistol, state CWP course, or equivalent).
2. Defensive pistol fundamentals: drawing from concealment, malfunctions, reloading, shooting under time pressure.
3. **Judgment and law**: use-of-force law courses (e.g., Massad Ayoob's MAG-40, USCCA or state-specific classes); force-on-force scenario training with non-lethal marking rounds (the closest thing to reality).
4. **Medical**: Stop the Bleed or a trauma-care course.
5. Ongoing practice; competition (IDPA, USPSA) builds gun-handling under stress.

**Home defense plan (the counter-intuitive consensus):** gather family into the safe room, **call 911 and stay on the line**, hold a defensible position covering the door, and let police clear the house. "Clearing" your own house alone is extremely dangerous and legally complicated. Identify your target before shooting — family members come home unexpectedly, and tragedies happen.

**Police encounters while armed:** keep hands visible, follow instructions, disclose calmly if appropriate, don't reach for anything without permission. Under SC's 2024 permitless-carry act, merely carrying a weapon can't by itself be used as the basis to stop, search or detain someone, and the prior duty-to-inform provision for CWP holders was removed — but calm disclosure remains the widely recommended practice. **\[LAW-2026\]**

**After a defensive incident:** ensure the threat is over and you're safe → call 911 → give only essential facts (you were attacked, you're the victim, where the evidence is, witnesses) → request medical help → **do not give a detailed statement before speaking with an attorney** → expect your firearm to be taken as evidence → expect civil exposure even if criminally cleared. Self-defense "carry insurance"/legal-defense memberships exist; compare coverage, exclusions and whether funds flow before or after a verdict.

## Where to go next (pack navigation, not source text)

- **The law that governs owning, carrying and using a firearm** — §17–§18 → `physsec-firearms-and-self-defense-law`.
- **Cannabis, alcohol and firearms** — §20–§21 → `physsec-alcohol-tobacco-and-cannabis`.
- **Stop the Bleed** — §13 → `physsec-personal-security-and-self-defense`.
- **The contested questions on both sides** — Part VIII → `physsec-decision-tools-and-contested-questions`.