I have an opportunity to purchase a like new MSR15 but know very little about them. I have several other brands of the AR platform including a Ruger 556, (not to be confused with the AR 556), Colt Sporter II, and Bushmaster Patrolman Carbine but have not had any experience with the MSR15. Are they made here in the USA and what is the good & bad about this model? It has a Nikon P-223 scope & a nice bi-pod. All comments welcmed. Thanks.