Setting Up Sights

[huesmann]

Have a new M4 built from PSA parts.

I have the stock front sight, a Magpul flip-up rear sight, and a Bushnell TRS-25 red dot sight on a 3/4" riser.

I assume the correct way of setting the sights up is to start with the iron sights (forgetting for a moment that the Magpul sight is actually plastic), and adjust those until accuracy is good, then put the RDS on and adjust that until accuracy is good?

 

[anil]

If the Red Dot gets in the way of the Irons, then it is probably best to adjust the irons first. Though, it probably doesn't really matter.

Not sure if it matters even if you are trying to have co-witness (irons and red dot point to the same spot).

I've always adjusted the irons first; but, I've never gotten new irons and a red dot on the gun on the same day.

 

[jimbobborg]

When I put the rear Magpul sight on my M4gery, it was dead on for 50 yards out of the box. Then I put an Aimpoint on, and used the sights to set the dot. When I got to the range, I lowered the Magpul sight and the Aimpoint was dead on at 50 yards.

 

[SRD]

When I put the rear Magpul sight on my M4gery, it was dead on for 50 yards out of the box. Then I put an Aimpoint on, and used the sights to set the dot. When I got to the range, I lowered the Magpul sight and the Aimpoint was dead on at 50 yards.

I did the same thing except I have the TRS also and I used a .83'' riser.HTH

 

[BradMacc82]

I went kind of bass-ackwards, I set my zero for RDS and then set the irons to co-witness with the RDS (EO-Tech 512).

 

[Tungsten]

To me, the red dot is much more accurate than irons. So I sighted it in, then I adjusted my irons to cowitness. It seems to work. I imagine it doesnt matter which one you do first. However my science background tells me to use the most precise and accurate tool I have to make a measurement, then use less accurate tools based off the first. I know most people say to use the irons until you are proficient with them and then worry about red dots and such, but if you have a red dot, it makes no sense not to use it.

**My experiences and advice are based on being a newb to the AR-15. So take it fwiw.

 

[hvymax]

For initial setup bore sighting works pretty well. Set your upper up on a steady rest and look down the bore. Adjust the sight/scope etc to match the bore then fine tuning should only take a few rounds.