 The X-TAR EP-449 for the Gen 2 model. It is an all-polymer, upper and lower receiver, an adjustable trigger that X-TAR came out with their own Glock pattern Megzies. This is an 18-round mag, very similar controls to an AR. All right, you got your bolt release right there. It does have a side charger on the left-hand side. You got your safety and a system that most people are familiar with. Now I have a Vortex AR Spark 2 on there. Weight is pretty light. It's all polymer and that's one of the benefits is that it is very light, right around four pounds.