Walther LG 300 and LG 400 are air rifles of the best quality. Unfortunately, they are only produced in the 7.5J version as standard. The world's leading air rifle shooters, as well as enthusiastic amateurs, are modifying these air rifles (PCP, windbreakers) to a version with a power of 16J or higher.
You can find the parts used to tune this great and very precise air rifle right here.