ZhuanJia 7x4 Bearings Designed For 210 FPS Nerf Gun

7x4 BCAR Introduction：

Features

• 28-bearing version length: 113 mm
• Recommended setup: Pair the 28-bearing tube with Nerf blasters around 210 FPS for higher accuracy.
• Seal & damping: Direct-insert, self-locking O-ring seal with louvered (baffle) damping.
• Ease of use: Push-fit durability with convenient self-locking.
• Tight, stable fit: O-ring air seal and louvered damping prevent looseness or wobble through repeated installs.
• Precision layout: Bearings are neatly arranged with optimized angles.
• Adjustability: Bearings are removable for fine-tuning.
• Low-friction design: A raised boss inside the bearing slot supports the inner race, preventing contact with the tube body and reducing excess friction.
• Custom bearings: Smooth surface, silky rotation, very high hardness, excellent wear resistance, and low friction coefficient.
• Compatibility: Fits snugly on any exposed metal barrel with a 16 mm (or similar) outer diameter.

Specifications:

• Overall length: 115 mm
• Outer diameter: 27.5 mm
• Lines: 7
  
• Rows: 4
  
• Total Bearings: 28
• Material: High-strength LPA+ composite.
• For barrels: Inserts onto 16 mm OD / 13 mm ID aluminum inner barrels
• Insertion depth: ~30 mm
• Recommended FPS: ~210 FPS
• Color: Ships in orange by default; contact us for custom colors.