The Dead Air Mojave Fixed Barrel Spacer (brand part no. PB139) lets a Mojave silencer with a booster assembly run on a fixed-barrel firearm. Dead Air designed it to protect the booster from the damage a spring-loaded booster takes when it reciprocates on a barrel that does not tilt. The spacer sits around the Mojave piston where the booster spring normally goes, inside the PB500 Booster Assembly, so it mimics a direct-thread mount. It is the simple, low-cost route for a pistol-caliber carbine owner who already has a Mojave.

Key Specifications

• The material is 17-4 stainless steel, a strong corrosion-resistant alloy for a part that sees blast and recoil.
• The finish is heat-treated stainless, a hard surface that holds up to repeated installs.
• Weight is just 0.5 ounces, so it adds nothing noticeable to the suppressor.
• It installs around the Mojave piston in place of the booster spring, inside the Mojave Booster Assembly.
• It is built for fixed-barrel firearms, where a reciprocating booster would otherwise be stressed.
• It works only with Dead Air Mojave pistons and the PB500 Booster Assembly that ships with the Mojave silencer.
• The spacer mimics a direct-thread mount, so the suppressor behaves as if it were threaded straight to the barrel.

Frequently Asked Questions

Does this fit the P-series booster assembly or pistons? No. Dead Air states the Mojave Fixed Barrel Spacer is not compatible with the P-series Booster Assembly or pistons. It works only with Mojave pistons and the PB500 Booster Assembly.

Why use a spacer on a fixed barrel? A spring-loaded booster is meant for a tilting barrel. On a fixed barrel the booster would reciprocate, and the spacer protects it from that damage.

Is there a better option for a pistol-caliber carbine? Dead Air first recommends a P-series fixed mount, KeyMicro or Xeno mount on pistol-caliber carbines, and offers this spacer as an easy, inexpensive way to convert a Mojave instead.

Buy the Dead Air Mojave Fixed Barrel Spacer, Stainless Steel

If you already own a Mojave and want it on a fixed-barrel gun, this is the part that makes the booster safe to use there. See more Class 3 parts and accessories from our Lubbock, Texas gun shop and order for fast, direct shipping.