Any input would be appreciated. My brother-in-law is in the Army, undergoing his last round of training before deploying to the sandbox this August. He's asked me for help in finding a Rifle Scope for his standard-issue M4 rifle. He's with some combat engineering types for construction , IED-clearing, etc (i.e. non-infantry mission): 1. What type of rail mount does the M-4 rifle come with? 2. Night Vision is NOT needed 3. Budget is $250 to $450 4. Optical scope is preferred, illuminated is optional 5. Is there anything like the Trijicon ACOG series scopes for under $500? 6. If you know of specific scopes preferred by active duty US Army personnel, I'd sure appreciate it. Thanks!