The Maxim Defense MS-45 is a modular .45 caliber pistol suppressor that you can set up in a short or a long configuration (Maxim Defense part no. MXM-48216). It ships with a .578×28 piston for compatible .45 handguns and mounts by direct thread. The tube is 7075 aluminum with steel and aluminum baffles, finished in anodize. Maxim rates it for compatible .45 handguns only, not for a pistol-caliber carbine.

Key Specifications

• The caliber is .45, rated for compatible .45 handguns only.
• It is not rated for use on a PCC, and it includes no PCC mount.
• The mount is a .578×28 direct thread, with a piston included for .45 handguns.
• Length is 6.53 inches short or 8.27 inches long.
• Weight is 8.16 ounces short or 12.32 ounces long.
• Outer diameter is 1.375 inches.
• The tube is 7075 aluminum, with steel and aluminum baffles.
• The finish is anodized.
• The firing schedule is full-auto rated, per Maxim, with no barrel restrictions.
• Maxim lists a sound figure of 131.34 dB at the left ear.

Frequently Asked Questions

Can I use the MS-45 on a pistol-caliber carbine? No. Maxim states the MS-45 is rated for use with compatible .45 handguns only and is not rated for use on a PCC. It does not include a PCC mount.

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.

Can I choose a short or long configuration? Yes. The MS-45 is modular and can be set up short at 6.53 inches or long at 8.27 inches.

Buy the Maxim Defense MS-45 Modular .45 Caliber Pistol Suppressor

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. One .45 can that you can set up short for carry or long for range work saves buying two. Order through Maxim Defense‘s suppressors lineup and our Lubbock, Texas team will handle the transfer, and it ships fast to your Class 3 dealer.