ARES MSR 338 Hop Up Rubber (#GB-63)
For increase Rifle range and accuracy
Suitable For MSR 338 Series Airsoft Rifle

Using heavier BBs and adjusting the hop up accordingly it will have a remarkable increase in range. The reason being is that the long contact patch nub inside doesn't readjust itself to fit the BB's profile as it gets squeezed through the bucking, allowing for a steadier passage way, which in turn allows the pellets to fly straighter and farther.

Disclaimer: All aftermarket upgrade parts require necessary skill or modification to install and assemble, please consult with your airsoft technician if needed.