The Luth-AR GT-CUP GrovTec Base/Cup is a compact, steel threaded base designed to integrate QD sling swivels into Luth-AR MBA buttstocks. Machined with precise external threads, it installs directly into the factory side cup holes on compatible stocks to create a clean, recessed QD attachment point that stays out of the way until you need it.

This threaded base cup is ideal for shooters who want a secure, repeatable sling interface on their AR-15 platform without adding bulk. Once installed with a dedicated tool or standard 1/4" Allen wrench, it works with QD sling swivels to support range use, training, and general rifle carry. It reflects Luth-AR’s focus on practical, reliable upgrades for modern sporting rifles.

Key Features:

• Manufacturer: Luth-AR
• Model: GT-CUP GrovTec Threaded Base Cup
• Material: Steel
• Attachment Type: Direct Thread QD sling base
• Model Compatibility: Luth-AR MBA-1, MBA-2, MBA-3, MBA-4 buttstocks
• Quantity: Single threaded base cup only