RE: (PICS) Check out my new rig (DPMS-AR15)
Hmmmm. IMHO - that scope doesn't belong on that rifle. Might look interesting, but from a practical application, not the best use of either.
That scope would be great on one of the "Varmint/Target" uppers, since those typically don't come with a front sight, sometimes not even a rail where the front sight used to be.
The M4 is really more of a close-quarters weapon. Holographic sights work particularly well in those applications. Having had occasion to use both in mud huts awhile back, the obvious advantage was that you could continue scanning while keeping reference of that red dot and ring, which when you found a target, the ring and dot almost naturally gravitated to it immediately.
Another option you might consider is a rear sight assembly such as the one standard on the Rock River Entry Tactical, which is also available separately. It's identical to your original rear sight except that where yours has the "carrying handle" (a term I hate), it's stepped down and forms a Picatinny Rail. It'll elevate your line of sight a little, take some of that front sight out of the way, and it's easily detached so that you can put your iron sights back on quickly if you need to.
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