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FAST hop-up for Silverback SRS-A1 (Field Adjustment Setting Hop-up). 6061 aluminum CNC machining hop-up unit for the Silverback SRS-A1. This new design allows you to adjust your hop-up in-game without any tool, in just few seconds. This hop-up utilizes standard AEG hop-up rubbers and AEG barrels. Packaging includes: 

- CNC 6061 aluminum hop-up body end (SRS425) 
- CNC 6061 aluminum hop-up body (SRS426) 
- CNC 6061 aluminum hop-up ring with laser markings (SRS427) 
- CNC 6061 aluminum hop-bar (SRS428) 
- 8x2 o-ring
- 10x1 o-rings (x2) 
- 5.8x0.75 o-rings (x2) - pre-installed 
- M3x4 (DIN 913 / ISO 4026) 10.9 screws (x3) 
- 1.5x8 stainless steel pin 
- 60 degree silicone hop-up rubber and nub (SBA-HOP-21)