The Gorilla Ammunition .300 Blackout Subsonic 220gr Sierra MatchKing is a precision rifle suppressor built to cut sound, recoil and muzzle blast on your build. Whether you run subsonic loads for the quietest possible shooting or supersonic loads at the range, the Gorilla Ammunition .300 Blackout Subsonic 220gr Sierra MatchKing brings serious, field-proven sound reduction to a rugged package — genuine, and ready to transfer.
Specifications
| Type | Rifle suppressor |
| Caliber rating | 300 Blackout |
| Finish | Black |
| NFA item | Yes — ATF Form 4 transfer required |
| Use | Subsonic and supersonic |
How the Gorilla Ammunition .300 Blackout Subsonic 220gr Sierra MatchKing reduces sound
A suppressor works by capturing and slowing the hot, high-pressure gas that follows the bullet out of the muzzle, giving it room and time to cool and expand before it reaches the air. That is what turns a sharp, damaging muzzle blast into a far more manageable report. The Gorilla Ammunition .300 Blackout Subsonic 220gr Sierra MatchKing is engineered around that principle with a baffle stack built to bleed off energy efficiently.
The practical result is meaningful hearing protection, less concussion at the bench, and a shooting experience that is simply more comfortable and more controllable shot after shot.
Subsonic versus supersonic, suppressed
Paired with subsonic ammunition, the Gorilla Ammunition .300 Blackout Subsonic 220gr Sierra MatchKing delivers about the quietest experience a centerfire rifle can offer — there is no supersonic crack for the can to fight, just a low, soft report. It is the combination serious suppressed shooters chase.
With supersonic loads the Gorilla Ammunition .300 Blackout Subsonic 220gr Sierra MatchKing still meaningfully reduces muzzle blast and recoil, though the bullet’s own sonic crack remains and no suppressor can remove it. Either way, you gain real benefits over shooting unsuppressed.
Multi-caliber versatility
Rated for 300 Blackout, the Gorilla Ammunition .300 Blackout Subsonic 220gr Sierra MatchKing is built to serve more than one host, so a single can can quiet a whole rack of rifles rather than being locked to just one. That flexibility is a big part of what makes a modern rifle suppressor worth the investment.
Always confirm the suppressor is rated for your specific cartridge, barrel length and pressure level before use, and follow the manufacturer’s mounting and maintenance guidance for safe, reliable performance.
Buying a suppressor: the NFA process
The Gorilla Ammunition .300 Blackout Subsonic 220gr Sierra MatchKing is an NFA-regulated item, so the purchase involves an ATF Form 4 transfer, a tax stamp and an associated wait while the paperwork is processed. We keep the buying side simple; your dealer handles the transfer to your location, and you take possession once it clears.
Suppressor laws vary by state, so confirm legality where you live before you buy, and check current availability and processing times. It is a straightforward process millions of shooters complete every year.
Pair it with the right ammo
A suppressor and the right load go hand in hand. For the quietest results, feed your suppressed rifle quality subsonic ammunition; for range and hunting reach, supersonic loads still benefit from the reduced blast. Browse matching loads in our 300 Blackout lineup, and read our 300 Blackout subsonic vs supersonic guide to choose the best ammunition for the Gorilla Ammunition .300 Blackout Subsonic 220gr Sierra MatchKing.
Why buy from Blackout Ammunition
We carry genuine suppressors and move them through the proper legal channels to lawful destinations. If you are unsure which can fits your build, our team knows the hardware and can point you to the right model. Review our shipping & delivery details, see the FAQ for anything else, and find ammunition and components to complete your setup, plus more gear at our sister store, blackoutammo.shop.
About the 300 Blackout cartridge
300 Blackout is one of the most versatile cartridges for the AR-15, delivering .30-caliber performance from a short, suppressor-friendly barrel using standard magazines. It runs equally well as a quiet subsonic load or a hard-hitting supersonic round simply by changing ammunition.
That flexibility is the cartridge’s signature strength, and it is exactly why so many shooters build around it. This Gorilla Ammunition .300 Blackout Subsonic 220gr Sierra MatchKing fits naturally into a 300 Blackout setup for hunting, defense or suppressed shooting.
Frequently asked questions
Is the Gorilla Ammunition .300 Blackout Subsonic 220gr Sierra MatchKing multi-caliber?
It is rated for 300 Blackout. Always confirm compatibility with your specific cartridge and barrel before use.
Do I need an NFA tax stamp?
Yes — suppressors are NFA items requiring an ATF Form 4 transfer and a tax stamp. Your dealer handles the paperwork.
Will the Gorilla Ammunition .300 Blackout Subsonic 220gr Sierra MatchKing work with subsonic and supersonic ammo?
Yes. It is quietest with subsonic loads; with supersonic loads it still cuts blast, though the bullet’s sonic crack remains.
How long is the wait?
NFA transfer times vary. Check current ATF processing times and availability before you commit.
Does a suppressor reduce recoil?
Yes — by managing muzzle gas it noticeably reduces felt recoil and concussion in addition to sound.
This product is an NFA-regulated suppressor intended for lawful use only. Purchase requires an ATF Form 4 transfer and tax stamp. You are responsible for complying with all federal, state and local laws; confirm suppressor legality in your area before buying.
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