Stern Defense SD 6in MOD5 MLOK .45ACP Upper Receiver Assembly 8in M-LOK Handguard .578-28 TPI 1-16 Twist Rate Black 015SD8INMD5ML6INBR45ACPKK
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Stern Defense
Overview
The Stern Defense SD 6in MOD5 MLOK .45ACP Upper Receiver Assembly is a complete upper designed specifically for the AR-9 platform, featuring a compact 6-inch barrel optimized for .45 ACP. With a twist rate of 1:16, this assembly ensures stability and accuracy for your shots, making it suitable for various shooting applications. This upper is commonly found in builds aimed at home defense or close-quarters engagements, where maneuverability and stopping power are key.
Specifications
Stern Defense SD 6in MOD5 MLOK .45ACP Upper Receiver Assembly 8in M-LOK Handguard .578-28 TPI 1-16 Twist Rate Black 015SD8INMD5ML6INBR45ACPKK
September 2026 on GunPartPicker
Stern Defense SD 6in MOD5 MLOK .45ACP Upper Receiver Assembly 8in M-LOK Handguard .578-28 TPI 1-16 Twist Rate Black 015SD8INMD5ML6INBR45ACPKK ranked #168 of the 615 upper receivers builders added on GunPartPicker in September 2026. Builders have been adding it to their builds on GunPartPicker since April 2026. All time, it ranks #269 of the 1,649 upper receivers builders have added.
Today both retailers we track have it in stock. Buying today, the lowest price is $550 at Optics Planet.
Updated · from real builds on GunPartPicker · Prices checked · refreshed daily across 35 retailers
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Build Configuration Breakdown
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Gas SystemBased on real build data showing which gas system lengths builders use with this product.
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