The Otter Creek Labs Infinity 556K is the 5.56 version of the Infinity, made because customers kept asking for one. It is printed from Haynes 282, a nickel superalloy that keeps its strength at high temperature even better than Inconel, and it keeps the Infinity's adjustable end-cap system: swap caps to change back pressure and it runs well on anything from a bolt action to a heavily over-gassed AR or AK.
It ships with the medium back-pressure end cap installed; low and high caps are sold separately. Low back pressure without giving up sound performance, low flash, and good results on both short and long barrels. It is also a 6mm-bore can, so 6 ARC, 6mm Creedmoor and 243 are fine. Made in London, Kentucky, with a lifetime warranty.
Why it stands out
- Haynes 282 construction: made to be handed down
- Adjustable end caps (medium cap included, low and high sold separately)
- 5.5" and 14.5 oz
- 6mm bore: 5.56, 6 ARC, 6 Creedmoor, 243
- 1.375x24 HUB rear thread
- Lifetime warranty
Specifications
| Caliber | 5.56 NATO / 223 Rem and 6mm |
|---|---|
| Length | 5.5" |
| Weight | 14.5 oz |
| Material | Haynes 282 |
| Rear thread | 1.375x24 HUB |
| Finish | Black Cerakote |
| Full-auto rating | Yes |
| Part number | INF556K |
| UPC | 664533654385 |
In the box
- Suppressor with medium back-pressure end cap
- Tube clamp
- Stickers
Compatibility
No mount is included. Use any 1.375x24 HUB mount, for example our Direct Thread Adapter in 1/2x28, or your existing HUB quick-detach system.
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 | Infinity 556K |
| Caliber | 5.56 NATO / 223 Rem |
| Type | Silencer |
| Finish | Black Cerakote |
| Material | Haynes 282 |
| Size/Length | 5.5" |
| Item Weight | 14.5 oz |
| Mount Type | 1-3/8x24 HUB |