The Geissele Maritime Bolt Catch (brand part no. 08-153) is designed with the warfighter in mind and works with any lower receiver built to accept a mil-spec M16/M4 carbine bolt catch. Its increased surface area promotes easier function when locking back the bolt or releasing it after a magazine change. The extended controls add real functionality for left-handed shooters, who no longer have to break their firing grip to manipulate the catch; a left-handed shooter can reach it with the index finger of the left hand, making magazine changes and bolt lock-back faster and more efficient. Aggressive checkering covers the surface of the levers, giving a textured feel that provides positive feedback when running the rifle with gloves or at night. Geissele manufactures it from properly heat-treated 8620 steel and finishes it in manganese phosphate, intending it as an enhanced mil-spec replacement.

Key Specifications

• Compatible with any lower accepting a mil-spec M16/M4 carbine bolt catch.
• Increased surface area for easier bolt lock-back and release.
• Extended controls add functionality for left-handed shooters.
• Left-handed shooters can operate it with the index finger without breaking their grip.
• Aggressive checkering for tactile feedback with gloves or at night.
• Machined from heat-treated 8620 steel.
• Finished in manganese phosphate.
• Measures 4.35 inches in length.

Frequently Asked Questions

Does this help left-handed shooters? Yes, the extended controls let a left-handed shooter operate the catch with the index finger without breaking their grip.

What material is it made from? Heat-treated 8620 steel, finished in manganese phosphate.

Will it fit any AR-15 lower? Yes, any lower receiver designed to accept a mil-spec M16/M4 carbine bolt catch.

Buy the Geissele Maritime Bolt Catch

Order the Geissele Automatics Maritime Bolt Catch from our Lubbock, Texas gun shop and speed up your magazine changes. It is a direct-fit upgrade among our AR bolt catch/release parts. Add it to your cart for fast, insured shipping direct to your door.