The GSI 3S Steel Buffer is designed for eliminating uncomfortable surging noise and maintaining recoil speed while increasing impact.
The recoil spring has been designed to locate inside the buffer and comes with 3 different springs, which can be chosen according to user preference or climate changes.  
The increased weight of GSI’s 3S Steel Buffer than the original buffer increases impact, but the structural design allows increasing rebound to maintain return speed.
3S Buffer reduces noise, offers smooth operation, and increases impact power. 
3S Buffer is made of composite materials that are steel, stainless, and engineering plastic providing optimal operability and balance. 
The GSI’s 3S is a unique convention from its own engineering efforts to improve airsoft gun operation, it stands for:  
Silent – decrease the noise. Smooth – Improve seamless operation, Shockup – Load time will be dramatically increased
 
• EAN & SKU :8809899600535, SKU:  
• Product Dimension & Weight: 3.88(L)x0.91(W)x0.91(H) inch 6.4oz
• Package Weight & Dimension:  10(L)x 3.3(W) x 1(H) inch 6.8 oz 
• Made in Korea