Survival JP shows the "Spectre" custom tune for the M110A1 AEG, designed to operate as quietly as a bolt-action sniper. He explains that this modification is specifically for large rifles that provide enough internal space for advanced soundproofing. Beyond just being quiet, the build is tuned for long-distance accuracy, capable of hitting targets at 50 meters with heavy 0.33g BBs, making it a specialized tool for stealthy players.