General Information This src m4 has modded after market parts including, tight bore barrel, new hop up system, new bearings, and now can use a lipo battery with ease! This gun destroys! And I love it. Gallery image-3498.jpg 1,008.4 KB Views: 27 image-3499.jpg 1.4 MB Views: 26 Share: Facebook Twitter Reddit Pinterest Tumblr WhatsApp Email Link