TANDEMKROSS Blast Pack for Ruger Mark IV & Mark IV 22/45

The TANDEMKROSS Blast Pack is a drop-in fire control upgrade for Ruger® Mark IV™ and Mark IV™ 22/45™ pistols. It pairs the Thunder Hammer and Lightning Sear with the Blast Shield Magazine Disconnect to give you a lighter, cleaner, more consistent trigger pull.

The radiused hammer/sear interface delivers a crisp, repeatable break at roughly 2–2.5 lb (results may vary). A lubricious coating keeps the engagement smooth from day one, and the lightweight hammer moves faster for reduced lock time. The Blast Shield replaces the factory magazine disconnect, helps align the magazine for reliable feeding, and keeps debris away from the hammer and sear.

Key Features

• Lighter, crisper, repeatable trigger pull (approx. 2–2.5 lb)
• Neutrally balanced, drop-safe sear
• Heat-treated S7 tool steel hammer and sear for wear and impact resistance
• Lightweight hammer for reduced lock time
• Blast Shield Magazine Disconnect improves magazine alignment and shields internals from debris
• Made in the USA, backed by the TANDEMKROSS lifetime guarantee

Kit Includes

• Thunder Hammer
• Lightning Sear
• Blast Shield Magazine Disconnect

Supported Models

• Ruger® Mark IV™ Standard, Hunter, Target, Competition, Tactical
• Ruger® Mark IV™ 22/45™, 22/45™ LITE, 22/45™ Tactical

Important: The hammer and sear are a matched set. Do not mix with another brand's hammer or sear.

This item cannot be shipped to California.