The Otter Creek Labs Polonium-30 is the short, tough .30 caliber version of the Polonium, built for the shooter who wants one suppressor to move between all of their rifles. It is CNC welded from H900 17-4 stainless in a tubeless design, about 5.8 inches and 13.5 oz without a mount, and rated for everything from a short-barreled full-auto 5.56 to 300 BLK, 308 and up to 300 Win Mag, 300 RUM and 300 Norma with the right barrel length. This is the Flat Dark Earth Cerakote version.
OCL is straight about the trade-off: a 30-cal bore gives up a little 5.56 performance to a dedicated 5.56 can like the Polonium. What you get in return is one can for the whole safe with respectable performance everywhere. It has the same built-in flash hider and heat-shedding exterior as the rest of the series, ships with a 5/8x24 direct-thread adapter and has the universal 1.375x24 rear thread. Made in London, Kentucky, with a lifetime warranty.
Why it stands out
- About 5.8" and 13.5 oz, H900 17-4 stainless, tubeless
- One can for 5.56 through 300 Norma Mag
- Built-in internal and external flash hider
- Full-auto rated; belt-fed rated on 16" 5.56 guns
- 5/8x24 direct-thread adapter included, 1.375x24 HUB rear thread
- Lifetime warranty
Specifications
| Caliber | 30 cal / 7.62mm (5.56, 6mm, 6.5mm and 7mm hosts too) |
|---|---|
| Length | Approx. 5.8" (no mount) |
| Diameter | 1.625" |
| Weight | Approx. 13.5 oz (no mount) |
| Material | H900 heat-treated 17-4 stainless steel |
| Mount | 5/8x24 direct thread (included); 1.375x24 HUB rear thread |
| Finish | Flat Dark Earth Cerakote |
| Full-auto rating | Yes |
| Part number | POLO762FDE |
| UPC | 664533654200 |
In the box
- Suppressor
- 5/8x24 direct-thread adapter
- Tube clamp
- Instruction pamphlet, stickers
Barrel length minimums
7.5" for 5.56 and 7.62x39; 10.5" for 6 ARC and 6.5 Grendel; 12.5" for 308, 6.5 Creedmoor, 6mm Creedmoor and 243; 16" for 300 Win Mag, 7mm Rem Mag and 300 PRC; 18" for 300 RUM and 300 Norma. Belt-fed: 300-round strings max on 16" 5.56 guns.
Buying a suppressor from Guns 2 Ammo
Suppressors are NFA items and are serial-number tracked. Order online or in store, then complete your transfer at our Mesa shop, either as a registered eForm 4 or same day on a Form 4473. Buy it from us and there is no transfer fee. We explain both options, fees and timelines on our NFA & Class III page.
Outside Arizona? We can ship to your local SOT dealer to complete the transfer. Not available in CA, DC, DE, HI, IL, MA, NJ, NY or RI.
Questions? Call (602) 715-2677.
| Manufacturer | Otter Creek Labs |
| Model | Polonium-30 |
| Caliber | 30 Cal / 7.62mm |
| Type | Silencer |
| Finish | Flat Dark Earth Cerakote |
| Material | Stainless Steel |
| Size/Length | 5.8" |
| Item Weight | 13.5 oz |
| Diameter | 1.625" |
| Mount Type | 5/8x24 Direct Thread / 1.375x24 Universal |