Check the listing for details. Lancer Tactical LT-15B-G2 M4 SD GEN 2 Polymer AEG Airsoft Rifle, Black. Condition: New. Listed at 179.99 USD. The Lancer Tactical LT-15B-G2 M4 SD GEN 2 Polymer AEG Airsoft Rifle in black is a high-quality electric automatic rifle designed for outdoor sports and airsoft enthusiasts. Made with a durable nylon polymer frame and a metal barrel assembly, this rifle features a 6.03mm inner barrel diameter and adjustable hop-up (rotary style). With a muzzle velocity of 370 - 390 FPS using 0.20g BBs, this rifle offers semi-automatic, full-automatic, and safe firing modes. It also comes with a 300 round high-cap magazine, rear wired battery connection, and a 9.6v NiMH nunchuck battery with included charger. The M4 SD Gen2 model is lightweight at 5 lbs and features a full metal Version 2 gearbox for reliable performance. See photos. Air soft rifle.