AR-40 .40 S&W, 10mm Bolt Carrier Group, Glock Compatible, 8620 Steel, M-16 Cut

AR-40 / 10mm BCG: Specs

The AR-40 .40 S&W / 10mm Bolt Carrier Group (BCG) is specifically designed for reliable performance in AR-15 platforms, accommodating both .40 S&W and 10mm calibers. Crafted from US-made 8620 steel and finished with a mag phosphate coating, this BCG is engineered for durability and smooth operation in high-performance builds. It’s Glock compatible, making it a perfect choice for Glock-style lower receivers.

This precision-milled BCG features a ramped carrier, which allows compatibility with both 9mm and standard AR hammers. Whether you're building a .40 S&W or 10mm pistol caliber carbine, this BCG ensures consistent and smooth cycling, offering the reliability you need for both recreational and professional use.

Designed with versatility in mind, this M-16 cut BCG is suitable for use in transferable full auto machine guns (MG's), dealer post-sample MG's, or other legal machine guns, subject to BATFE rules and regulations. Additionally, this BCG can be used in a large-frame lower to run 10mm rounds.

Key Features:

• Caliber Compatibility: Works with .40 S&W and 10mm calibers for versatile use in your AR platform.
• Glock Compatible: Precision-milled for use with Glock-style lower receivers, ensuring a reliable fit and function.
• 8620 Steel Construction: Manufactured from durable 8620 steel, offering strength and longevity.
• Mag Phosphate Finish: Provides corrosion resistance and a durable, smooth finish for reliable performance.
• Ramped Carrier: Allows compatibility with both 9mm and standard AR hammers.
• M-16 Cut: Suitable for use in full-auto builds, including transferable machine guns (subject to BATFE regulations).
• Weight: Weighs 14.3 oz, providing a balance of durability and performance without compromising overall weight.

Specifications:

• Model: AR-40 Standard .40 S&W BCG (Glock Compatible)
• Caliber: .40 S&W / 10mm
• Material: 8620 steel
• Finish: Mag phosphate finish
• Compatibility: Glock-style lower receivers, large frame lowers for 10mm
• Ramped Carrier: Works with both 9mm and standard AR hammers
• M-16 Cut: For use in full auto builds (BATFE rules apply)
• Weight: 14.3 oz

Why Choose the AR-40 .40 S&W / 10mm Bolt Carrier Group?

• Versatile and Reliable: Perfect for .40 S&W and 10mm builds, the AR-40 BCG offers smooth operation and precision engineering.
• Glock Compatible: Specifically designed to work seamlessly with Glock-style lower receivers for consistent cycling.
• Durable Construction: Made from 8620 steel with a mag phosphate finish for superior strength, corrosion resistance, and long-lasting performance.
• M-16 Cut Design: Suitable for use in full-auto machine gun builds, following all BATFE rules.

FAQ

Which calibers does it run?

.40 S&W and 10mm in Glock-compatible blowback ARs.

How does it operate?

It is a direct blowback pistol-caliber design with no gas tube or gas block, so a heavy PCC buffer is used for reliable cycling.

Related: PCC bolt carrier groups · pistol caliber carbines

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