The GSL Python suppressor for .45 ACP is a 7075 aluminum pistol can that mounts with an interchangeable piston core (GSL part no. PY-100-SUP). GSL Technology says it can be fired on .45, .40, 10mm or 9mm handguns by swapping the rear piston, so one suppressor can serve several pistols. It measures 6.5 inches without the adapter, 1.375 inches across and weighs 10.2 ounces, finished in hard coat anodizing. GSL rates it at 30 dB of reduction. It is built by GSL Technology in Jackson, Michigan, for handgun owners who shoot more than one caliber.

Key Specifications

• The caliber is .45 ACP, with rear-piston swaps for .40, 10mm and 9mm hosts.
• Sound reduction is rated at 30 dB by GSL.
• Length is 6.5 inches without the adapter, compact for a .45-capable can.
• Diameter is 1.375 inches, slim enough to stay usable with many handgun sights.
• Weight is 10.2 ounces, light enough to keep a pistol running and balanced.
• Construction is 7075 aluminum with a hard coat anodized finish.
• The included mount is a .578-28 direct thread piston, the common .45 ACP barrel thread.

Frequently Asked Questions

Which pistol calibers can it be used on? GSL states that the Python can be fired on .45, .40, 10mm or 9mm weapons by swapping the rear piston.

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 pistons are available? The package includes one .578-28 direct thread piston. GSL sells additional pistons separately in M16x1 RH, M16x1 LH, M14.5×1 LH, 9/16×24 and 1/2×28.

Buy the GSL Python .45 ACP Suppressor

A piston-mounted aluminum can that moves between calibers is the efficient way to suppress a mixed handgun collection. 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 GSL Technology‘s silencers and suppressors lineup and our Lubbock, Texas team will handle the transfer.