NBC-77 SOF® 40mm NATO Gas Mask Filter (CBRN)
The NBC-77 SOF® is a professional-grade 40mm NATO (Rd 40 × 1/7”) CBRN filter engineered to provide comprehensive respiratory protection against all known chemical warfare agents, toxic industrial chemicals, biological threats, radioactive particulates, and radioactive iodine compounds . Designed for long-term readiness and operational durability, it combines CBRN, TIC, and reactor-rated filtration into a single cartridge.
With a 20-year factory-sealed shelf life , the NBC-77 SOF® significantly reduces lifecycle replacement costs compared to standard 5–7 year filters, making it an ideal choice for preparedness, professional response, and long-term storage . Its rugged hard-shell housing protects the filtration media from impact and environmental damage while maintaining compatibility with all standard 40mm NATO-threaded respirators and PAPRs .
This filter is certified under EN 14387:2004 + A1:2008 and carries the A2B2E2K2HgSXP3 D R REACTOR classification, placing it among the most broadly protective consumer-accessible filters available.
"A prudent person foresees danger ahead and takes precautions. The simpleton goes blindly on and suffers the consequences. - Proverbs 27:12"
CBRN Certified
Protects against chemical, biological, radiological, and nuclear threats
40mm NATO Thread
Universal connector fits standard tactical gas masks
MIRA Safety Specification
Built to MIRA Safety's NBC-77 SOF R standard
The numbers, flat and honest.
| Thread | 40mm NATO (universal) |
|---|---|
| Protection Level | CBRN (Chemical, Biological, Radiological, Nuclear) |
| Series | NBC-77 SOF R |
| Compatibility | Standard tactical gas masks with 40mm NATO thread |
| Manufacturer | MIRA Safety |
WHY YOU’RE BUYING FROM STAY READY.
We aren’t the Amazon of survival. We’re a small, opinionated shop that carries gear we’d stake our own lives on — and we back every piece with real support.
Curated
Every brand we carry has been vetted in the field by our team. If it doesn’t pass our 30-day use test, we don’t stock it.
Authenticated
Factory-direct from authorized dealers. No grey-market, no refurb, no knockoffs. Your warranty is real.
Supported
Real humans on phone, text, and email — seven days a week. We carry this gear ourselves and we stand behind it.
American
HQ in California. Orders ship from our US warehouse. US-based customer care.
CBRN RESPIRATORY PROTECTION
Professional-grade protection without the gatekeeping. CBRN gas masks for civilians since 2018.
MIRA Safety was founded by Roman Zrazhevskiy and Tanya Mironova in 2018 — born out of Roman's own experiences with 9/11 and Hurricane Sandy and the realization that civilians had effectively no access to military-grade respiratory protection. Their flagship CM-6M gas mask launched in 2018 (and was later featured in Christopher Nolan's TENET). The company partners with European defense contractors to bring CBRN-rated masks, filters, and protective equipment to professionals, preppers, and families — including a full line of children's protective equipment. Their philosophy: "When crisis strikes, you can't rely on anyone but yourself."
- Founded in 2018 by Roman Zrazhevskiy and Tanya Mironova
- Built on Roman's personal experience with 9/11 and Hurricane Sandy
- CBRN gas masks, filters, and protective equipment
- Flagship CM-6M featured in Christopher Nolan's TENET (2020)
- Manufactured with European defense contractor partners
Answers, straight up.
Product-specific questions on the left. Shopping with SRO on the right. Both open-ended — hit us if we missed one.
How long does shipping take?
Most orders process within 1–3 business days from our warehouse. From there: 5–7 business days economy, 2–3 business days expedited, or overnight if you need it fast. Free economy shipping on orders over $150 (contiguous US). Alaska, Hawaii, and Pro Eagle / freight items are quoted at checkout. You’ll get a tracking number and link the moment your order ships.
What’s your return policy?
30 days from the day your order arrives. Gear has to come back unused, with all original tags, stickers, and packaging intact. For standard items we’ll send a prepaid return label and deduct return shipping from your refund. Oversized or freight returns are on you, unless the item showed up damaged, defective, or wrong — in which case we cover it.
Refunds hit your original payment method within 10 business days of approval.
What can’t I return?
Final-sale items, gift cards, food and drink products, personal-care items, anything customized or engraved, briefs (hygiene), and hazardous materials. If you’re not sure whether something qualifies, email us before you order — we’ll tell you straight.
Do you ship outside the contiguous US?
Yes. Alaska, Hawaii, and US territories ship on freight-quoted rates calculated after checkout. International orders are available worldwide at variable rates; duties and import fees are the customer’s responsibility. EU customers get a 14-day cancellation window per EU consumer law, on top of our standard return policy.
My package arrived damaged — what now?
Email info@stayreadyoutdoors.com within 7 days of delivery with your order number and clear photos of the damage (product + packaging). We’ll replace, refund, or ship a return label on us — no back-and-forth. Damaged, defective, or wrong-item claims never cost you shipping.
Can I talk to a human before buying?
Yes. Email info@stayreadyoutdoors.com — we answer every message ourselves, usually within a few hours during business days. We carry this gear, we use this gear, and we’d rather talk you out of a kit that doesn’t fit your mission than sell you the wrong one.
Do you offer a military/first-responder discount?
Yes. Active-duty and veteran military, police, fire, EMS, and medical first responders get 15% off every order. Verify through GovX at checkout — one-time, secure, and reusable across thousands of brands. Discount applies automatically once you’re verified.