The Maxim Defense MS-5.7K suppressor is the short version of Maxim’s dedicated 5.7x28mm can, a 4.4-inch silencer built for the cartridge rather than borrowed from a general pistol design (Maxim part no. MXM-48214). Maxim’s own argument is that most 5.7 rated silencers fall short on both sound reduction and durability with this round, so the company carried its M-Kore technology over into a can made only for it. It threads straight onto the barrel and ships with both of the thread inserts 5.7x28mm hosts commonly use. The tube is 7075-T6 aluminum and the mount and thread insert are Grade 5 titanium, which keeps the package small and light on a compact pistol or carbine. Maxim builds it in the USA for heavy-duty use, up to and including full-auto fire.

Key Specifications

• The caliber is 5.7x28mm, the only cartridge this suppressor is designed around.
• Mounting is direct thread, so the can screws straight onto a threaded barrel with no adapter stack.
• It ships with 1/2-28 and M10x1 thread inserts, covering the two barrel threads found on most 5.7x28mm firearms.
• Length is 4.4 inches, the short K configuration of Maxim’s 5.7 line.
• Outer diameter is 1.5 inches, a slim profile for a compact host.
• The tube is 7075-T6 aluminum, a high-strength alloy that keeps weight off the muzzle.
• The mount and thread insert are Grade 5 titanium, a hard-wearing alloy at the point that takes the threading load.
• The finish is anodized with DLC (diamond-like coating) in black, a hard surface for a can that gets handled hot.
• Maxim lists no barrel length restrictions, so it can go on a short pistol barrel as well as a carbine.
• Maxim rates it for heavy-duty and full-auto use on any 5.7x28mm firearm.

Frequently Asked Questions

Do I need ATF approval to buy this? No. As of October 9, 2026, ATF no longer requires Form 4 approval, registration or a tax stamp for suppressors. It transfers on a Form 4473 with a background check through a Class 3 (SOT) dealer. State and local laws still apply.

Which barrel threads does the MS-5.7K fit? It is a direct-thread suppressor that ships with two thread inserts, 1/2-28 and M10x1, which between them cover the common 5.7x28mm barrel threads.

Is the MS-5.7K suitable for a 5.7x28mm pistol? Yes. Maxim lists no barrel length restrictions and describes the MS:5.7 and MS:5.7K as at home on any 5.7x28mm firearm you own, even on full-auto.

Buy the Maxim Defense MS-5.7K 5.7x28mm Suppressor, Black

As of October 9, 2026, this suppressor transfers on a Form 4473 with a background check at your Class 3 (SOT) dealer, with no Form 4 or tax stamp; state and local laws still apply. Order through Maxim Defense‘s silencers and suppressed firearms lineup and our Lubbock, Texas team will handle the transfer, and it ships fast to your Class 3 dealer. It is a lot of suppressor in a very small 5.7x28mm package.