The model looks like a Silencer .45 ACP or 9MM

The model looks like a Silencer 50BMG

Advanced Culling System - it’s a bundle of tools for optimizing Your games.The main idea is hiding objects that not visible by the camera. For example, these objects may be overlapped by one large object or by many small objects.In the description, you can find links on videos demonstrating how this tool works. For example, comparisons of Occlusion Culling and Advanced Culling System

Humanoid Basics is a small framework for creating a Third-Person game. Comes with basic Third Person Camera. Humanoid Basics is the perfect solution for creating any 3rd person game. It is a simple, kinematic character controller designed to have the smoothest third-person controls and to excel in all projects. Originally based on a GTA III style controller.