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The Grunt® is compact and lightweight. The patented one piece core is machined from billet bar stock and has no internal welds. The GRUNT is direct-thread on in 1/2 x 28 and is full auto rated on barrels down to 10″. It also features wrench flats that allow easy pin and weld for short barrels and is available in Black, OD Green, FDE, Burnt Bronze, or Brushed Stainless. The Grunt is rated for .22-250, and is available with our patented Exoskeleton Shroud. Click the tabs below for more information, including pricing, customer reviews and how to order.

For the most compact size check out the GRUNT-M (mini).

If you are shooting a suppressed direct impingement 5.56 AR15 rifle, then you may want to checkout the W.A.R. adjustable upper receiver.

How To Order

To order, contact your local Innovative Arms dealer or give us a call at 803-408-9955.

Don’t have a dealer in your area? Use our dealer locator to find a dealer near you.


More Information and Pricing

GRUNT 5.56

Caliber: 5.56mm
Weight: 17.5oz
Length: 6.25”
O.D: 1.5″
Material: Stainless Steel
Finish: Black, OD Green, FDE, Burnt Bronze, or Brushed Stainless
TPI: 1/2 x 28
DB Reduction: 32-35 Dry

The Grunt is rated for .22-250.

MSRP: $599

GRUNT 5.56 with Exoskeleton

Caliber: 5.56mm
Weight: 18.8oz
Length: 6.25”
O.D: 1.5″ /1.58″ Exoskeleton
Material: Stainless Steel
Finish: Black, OD Green, FDE, Burnt Bronze, or Brushed Stainless
TPI: 1/2 x 28
DB Reduction: 32-35 Dry

The Grunt is rated for .22-250.

MSRP: $649

* The Exoskeleton™ Shroud gives many advantages, it also works as a heat sink and gives added grip when mounting the suppressor to the rifle.

As with all our silencers, the GRUNT can be fired “wet” or “dry”.  Do not use a crush washer in conjunction with any Innovative Arms silencer.


Customer Reviews

To leave your review below, you must be an actual owner of this product, or a verified Innovative Arms Dealer. For verification purposes, the serial number, and/or product registration are required to be able to submit a review. 

Write Your Review

GRUNT 5.56
Average rating:  
 5 reviews
 by Frank
Location: TN

This is a TOUGH suppressor. This can has seen heavy duty use and still performs like new. Highly recommend it.

 by Joe I
Occupation: Veteran, Joe I is also an: Avid Shooter and Law Enforcement/ Military

The Grunt 556 looks great and performs well. 

 by Mark danson
Occupation: Architectural design, RSO

Love my grunt haven’t had any problems. It’s a tough robust suppressor,and reasonably light weight given the material. Purchased it 5 years ago without a shroud, but then decided to have the shroud added last year. They were easy to work with, it took about two weeks until I received it back. I recommend IA to anyone wanting a top of the line suppressor at a good price.

 by Sean Johnson

I own over a dozen suppressors from multiple manufacturers. I liked what I had heard about this company and their products, and I wanted to see what this company was producing. I purchased the Grunt with exoskeleton and their W.A.R. upper. I’ve had the Grunt for several months now, and here’s my take on this suppressor and my experience with the company.

My dealer did not have  this model in stock and they had to order it. They placed the order at noon and by 3pm IA had submitted the form 3 and emailed them a copy of the form. It took 29 days until my dealer received the suppressor. 26 days of that was just waiting on the ATF to approve the form 3. So apparently, IA shipped the suppressor to my dealer the same day it was approved.
A rating on packaging and information.
It was packaged securely, in a sturdy, classy looking box. It had well written information enclosed along with a decal of their logo.
A rating on fit and finish.
Where they weld the core and exo to the tube looks good with nice clean welds, the engraving is crisp, and the finish is flawless and durable, as expected. It is not cumbersome at all, feels great on the rifle. The fit and finish is great and it looks down right sexy on my 10.5” SBR. I did not give the Grunt an A+ because I think that there may be better coatings out there. IA’s coating is holding up just fine but I think something like cerakote may last longer. I do not have any data on that so I’ll have to wait and see how long the finish lasts.
A rating on durability (so far).
As I said earlier, I’ve only had it for a few months, since February. It has had roughly 3,000 rounds through it. The finish is like new and the core has zero build up, from what I can tell. It looks like new except the core does not have the shine from being new steel. In my opinion the Grunt is very durable, with a tank tough design.
A+ rating on POI
Out the box, the POI between suppressor on/ suppressor off is about ½”. It’s consistent and repeatable. No variations, and it’s dead nuts.
A rating on sound reduction (I do not have db equipment)
It sounds just as quiet as my SiCo can and more quiet than my AAC on both my carbine and SBR. The Grunt has a deep tone, and it doesn’t ring my ears. If I’m shooting suppressed more than a few rounds on the SBR I wear ear pro as a precaution against hearing loss. When low light shooting the muzzle flash is maybe 1” on the first round. Then by the next round it is totally gone. I can’t give the Grunt an A+ rating because I do not have db equipment to compare numbers, but going by comparison shooting with my other cans, the Grunt is on par with major manufacturers and in some instances, sounds better because of the tone.

A+ customer service.
I contacted IA through email on their website twice. The first time I asked about the WAR receiver. The next day I got an email from Jenny with detailed information, and a link to a dealer that had the WAR in stock. The second time I asked about the Slingshot suppressor and warranty information. Jenny emailed me back in a few hours with detailed information, and to my surprise I also received a voicemail from Phillip with information on the 50/50 mix for cleaning the slingshot. Outstanding.

Location: Norton, Ohio

We sell these exclusively. We have most if not all in stock and ready to transfer. AND you can “Try” b4 you buy as well. Full auto rated suppressors at less cost and Better quality than the competitors. Give us a shout. 330-714-3414