Home » Shop » Sig Sauer MODX-45, 45ACP, 9.25″ Length, 1.35″ Diameter, Cerakote Finish, Gray
Home » Shop » Sig Sauer MODX-45, 45ACP, 9.25″ Length, 1.35″ Diameter, Cerakote Finish, Gray
Sale!
$1,099.99Original price was: $1,099.99.$999.99Current price is: $999.99.
🔇 No Form 4 needed — since October 9, 2026 a suppressor transfers on a standard Form 4473 and background check, with no tax stamp or wait. Texas buyers can complete it with us; out-of-state orders ship to an SOT dealer in your state. How it works.
Sig Sauer MODX-45 .45 ACP titanium suppressor, black, with mount — Sig’s modular titanium .45 suppressor for threaded .45 ACP pistols including 1911 and P220 platforms. No Form 4 needed.
Update, October 9, 2026: ATF no longer requires a Form 4, tax stamp, fingerprints or registration for suppressors, short-barreled rifles, short-barreled shotguns or AOWs. They now transfer on a standard Form 4473 with a background check. Anything below that mentions a Form 4, a wait or a tax stamp was written before this change. What changed
The Sig MODX-45 brings titanium suppressor engineering to .45 ACP — the naturally subsonic pistol cartridge with the most suppressor-friendly ballistics in the American handgun market. .45 ACP is supersonic only in rare +P+ loadings; virtually all standard .45 ammunition is inherently subsonic, meaning no separate subsonic loadings are required to achieve the best suppressor performance. Titanium construction makes the MODX-45 among the lightest large-bore pistol suppressors available at this price point — critical for 1911s and P220 platforms where a heavy muzzle-mounted suppressor changes the pistol’s handling significantly. The MODX designation indicates Sig’s modular baffle configuration, giving the owner flexibility to configure for their preferred balance of sound reduction and length.
Sig MODX-45 Specifications
Spec
Detail
Caliber Rating
.45 ACP (inherently subsonic)
Construction
Titanium
Mount
Direct thread (mount included)
Finish
Black
Compatible Hosts
Threaded .45 ACP pistols (1911, Sig P220, HK USP, etc.)
NFA Class
Suppressor. Transfers on a Form 4473, with no Form 4 or tax stamp since October 9, 2026
MSRP
$1,149.99
Ordering from Western Sport
Order online and we ship it to the licensed FFL dealer you choose near you — see how buying a gun online works. Western Sport has been a licensed FFL/SOT dealer since 2007, and everything we sell carries the full manufacturer warranty. Questions before you order? Send us a message.
FAQ — Sig MODX-45
Why is .45 ACP ideal for suppressor use?
.45 ACP has a muzzle velocity of roughly 850–950 fps with standard ball ammunition — well below the speed of sound (approximately 1,125 fps at sea level). Because the bullet travels subsonically by default, there’s no supersonic crack — one of the two main noise sources that suppressors cannot eliminate. The suppressor only has to address the muzzle blast, which it handles very effectively. This gives .45 ACP some of the best suppressed performance of any pistol caliber with standard ammunition, no specialty loads required.
What thread pitch does the MODX-45 use?
Standard .45 ACP pistol thread pitch is 0.578×28. Most 1911 threaded barrels use this pitch; the Sig P220 threaded model also uses this pitch. Confirm your specific barrel’s thread pitch before ordering.
Buying a suppressor now: a Form 4473 and a background check. No Form 4.
Since October 9, 2026, ATF no longer requires a Form 4, tax stamp, fingerprints, photos or registration to buy a suppressor. It transfers like any other firearm: you fill out a Form 4473, pass a NICS background check, and it is yours. No months-long wait.
Texas buyers: suppressors are legal under Texas law. Western Sport has been an SOT / Class III dealer since 2007.
Outside Texas: we ship to an SOT dealer in your state, who completes the 4473 with you. Your state’s law still decides — some states ban suppressors, and some only allow ones registered with ATF.
Want it registered anyway? ATF still accepts a voluntary Form 4. Ask us.
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