
Originally Posted by
meisterhau
We don't know what system you are running. This post will probably read on a more basic level than you need, but I don't intend any condescending or simplistic tone. Please don't take it that way... I'm just thinking things through and trying to help even without some important facts.
I'm going to make two assumptions. First, you have a flat-top, not a fixed carry handle. Second, you do NOT have a funky rail like the CASV installed, which raises your rails across the top of your upper receiver, which can do funky things to how things line up.
IF you have a front sight post, obviously you have a front sight already, and will only need a rear. If not, you need both. You know this - like I said, I'm typing out my thought process, not calling you stupid. When you mentioned "Magpul system", it hinted that perhaps you need both. There have been some pretty good reviews of Magpul's MBUS sights on this forum. I have not actually run a pair, but I have seen them on another M4, and I thought they were fine. I personally run the TROY sight. To my knowledge, it makes no difference what BUIS you run - they will line up and can be sighted in.
You said you were running the Aimpoint M4. Great sight. The stock mount that comes with it will allow you to set it up as either absolute or lower 1/3 co-witness. If you want absolute, turn the sight over, unbolt the mount, take out the spacer, and bolt the mount back on using the shorter bolts that were included. If you want lower 1/3, it will be set up that way straight out of the box.
Sight in your irons, put your M4 sight on, and sight it in separately. Makes no difference what BUIS you are running - they'll co-witness.
The nature of the Aimpoint sights is such that where the dot is, the bullet goes. That's the beauty of the parallax-free design. You don't have to line up the irons and the red dot to be accurate. THAT is the reason people are suggesting lower 1/3 co-witness - so you can rapidly acquire a target accurately through your sight while looking over your iron sights. You have more clear glass to see through - especially if you have a fixed front sight or fixed both sights. Think of it this way - you have a great view from a big picture window - why cover half the window with a couch? You will rely on your red dot independently much more than your irons, or you're sacrificing the benefit of it.
Bottom line - you have a kick-ass Aimpoint. You're installing back up sights as a redundant, back-up system. It doesn't really matter what you use, as long as they're quality parts. The Magpul MBUS set is pretty inexpensive, folds out of the way, seems to be reliable based on others' reviews... it will probably be a good solution for you, especially if you need both front and rear, and you're trying to keep cost down.
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