Need Your Barrel Fit for an HK A5 Upper? We’ve Got You Covered.
STS has developed a custom fixture to precisely locate and orient your barrel and its extension, allowing us to machine the exact cutout required for a proper fit with an HK A5 upper receiver.

📦 Send Us Your Barrel:
Please ship your stripped barrel only (no hardware) to:

Specialized Tactical Systems
3770 N Higley Rd. Unit 1
Farr West, UT 84404

📝 Be sure to include your order number both inside and outside the package.

⏱️ Typical turnaround time: 2–3 weeks.