1st AR Rifle - sighting in question

[FA Duk]

Taking delivery next week on my first AR .. a .308 w/a 5-25 vortex. Intent is medium range shooting 300-900yds.

Question is bore sighting it as I’ve always just looked down the bolt and had an easy time getting up to distance.

Current thinking is to manually sight in and burn 20 or so rounds vs purchasing a $150 bore sighting gizmo.

Thoughts/suggestions?

 

[Downtown]

Not sure I understand. You bore sight the same as a bolt action, just separate the lower, pull the bolt, look down the bore. Shouldn't take even 20 rounds after that.

 

[FisherT&C]

You sort of need a specific bore sight for ARs because of the height above bore is significant compared to a bolt gun. I would just look down the barrel at 25 yards, shoot it on and walk it out to 100 or whatever. Save your money for ammo.

 

[The DFC]

Get it on paper at 25yds-get windage squared away and elevation 1-2 inches low-then dial it in at your desired distance.

 

[FA Duk]

Not sure I understand. You bore sight the same as a bolt action, just separate the lower, pull the bolt, look down the bore. Shouldn't take even 20 rounds after that.

Thx ... didn’t know I could just do the same ... stabilizing the separated upper and sight down the bore as I do with bolt action.

 

[Gatorshark]

Yup. Pull out rear pin only and drop lower down to separate receivers. With handguard on sandbag, peep down the pipe and dial scope in.
Remember when dialing in scope with this method, up is down and left is right on scope turrents. Know what I mean?

 

[Rocketvapor]

Find something SEVERAL hundred yards out.
Insulator on a telephone pole.
Get as close as you can to parallel.
then bring the scope "impact up" about 3 MOA without looking.
Shoot one at 100yds. (not at the insulator )

 

[NighthawkCG]

What Gatorshark said. I use a magazine between the upper and lower to stabilize the two when open.

 

[davsco]

separate the upper and lower. pull the bolt. bipod on the upper, box or something under the rear of the upper. look thru barrel to a fence rail top or something at 100yds. turn scope dials to the fence rail top, double check that barrel is still aimed there.

shot or two at 25 just to be sure, then shoot at 100 and fine tune.