When I got in-country I had to purchase I good bit of my own kit. I ended up buying a surefire m4 (which you can find for a decent price..used..on ebay) and am very satisfied with it. I also had it blow some crappy rechargeable li-ions out of the lens and through my road guard vest (but was stopped by my body armor)...this, along with the cordite smell and the late-detonating batteries that had been shot out vertically...and were then detonating... caused me to do a combat roll and come up with sidearm in hand, traversing for targets. it took me a second to realize what happened (I had shoved it in a back pocket) and then was a bit confused as to how the glock had found it's way into my paw. After a WHOLE LOT of laughing, surefire replaced the damn thing and I had a new one within a week. Their customer servic3e simply cannot be beat. The lights ARE expensive but provided they're not lost or stolen, it's a lifetime light. I use my M4 on a leitner-wise M468 (well, "m6a2") and am very happy with it. I would caution against cords, though, they tend to break and/or snap off at the wrong time, every time.