Renowned for its accuracy, the HW 77 is widely considered the most successful underlever air rifle ever made.

[1] It is also known for its rugged construction, considerable weight and precision adjustable trigger.

The HW 77 K weighs approximately 100 grams less than the full-length rifle, and overall length is 100mm shorter.

Since its inception in 1984, the HW 77 has been the subject of numerous minor improvements and upgrades.

HW 77 models are frequently classed into three progressive 'Marks' by owners and enthusiasts; however, these classifications are not officially used by Weihrauch.