What's "retopo"?
"""Retopo" is short for "retopology," a process in 3D modeling and animation where the geometry of a high-resolution 3D model is reconstructed to create a new, optimized version with a lower polygon count. This new version maintains the essential details and shape of the original model but is more efficient for use in real-time applications like video games or animation.""
for this asset, maybe you just need to clean up some edges,
bakes some textures for the glock
but i think it's ok to use, don't worry if you don't need extra fps :)