The JK Armament Booster/3 Lug Adapter in 1.125-28 TPI (JK Armament part no. JK155LTA25) is a precisely manufactured thread adapter ring. It adapts your favorite pistol booster or 3 lug mount to a JK Armament 155 suppressor or to any other suppressor with the industry-standard HUB 1.375×24 thread. The 1.125-28 version is one of three internal thread sizes JK makes to fit boosters and 3 lug mounts from many companies. It is machined from 7075 billet aluminum, Type III hardcoat anodized in black. Use it to keep the mount you already own and move it to a HUB-threaded suppressor.

Key Specifications

• The internal thread is 1.125-28 TPI, sized for the boosters and 3 lug mounts on JK’s compatibility list.
• The suppressor-side interface is HUB 1.375×24, the industry standard that JK 155 suppressors use.
• The material is 7075 billet aluminum, a strong alloy that keeps the adapter light.
• The finish is Type III hardcoat anodize in black, a durable coating for a thread adapter.
• The diameter is 1.55 inches, the same size as the JK 155 suppressor body.
• The weight is 0.5 ounce, so the adapter adds almost nothing to the setup.

Frequently Asked Questions

Which mounts does the 1.125-28 adapter accept? JK lists the SilencerCo Octane 3 Lug Mount (AC2447 and AC2448), the SilencerCo Alpha ASR Mount (AC2632), the Griffin Plan A (TMA1125x28), the Griffin A2 Optimus Blast Shield and the Area419 Hellfire Mount (Harvest option).

What suppressors does it attach to? JK 155 suppressors and any other suppressor with the industry-standard HUB 1.375×24 thread.

Are other thread sizes available? Yes. JK also makes this adapter in 1.180-24 TPI and 1.203-28 TPI, so match the internal thread to the booster or 3 lug mount you own.

Buy the JK Armament Booster/3 Lug Adapter, 1.125-28 TPI

This adapter lets a booster or 3 lug mount you already own move onto a HUB-threaded suppressor, and the internal thread is the detail to match. Order it with the rest of our Class 3 parts and accessories from our Lubbock, Texas gun shop for fast direct shipping.