Tips for accurizing an ar...

If you want an accurate one, put on a quality barrel with a quality trigger and square the face of the receiver. I have built quite a few that will consistently shoot .5 MOA or better groups. You must use quality parts though if you want that.
That was three of the main points made on the Accurate Shooter article. A heavy duty quality upper was another. Mil spec had to much flex.
 
Tip #1 Bolt guns and AR's require different shooting/gun handling techniques. The typical higher optics on an AR will alter the trajectory path of bullets, requiring zeroing corrections. The old scope on a carry handle setup really messed up bolt gun guys, trying to shoot mid range targets with a 100 yard zero.
 
Tip #1 Bolt guns and AR's require different shooting/gun handling techniques. The typical higher optics on an AR will alter the trajectory path of bullets, requiring zeroing corrections. The old scope on a carry handle setup really messed up bolt gun guys, trying to shoot mid range targets with a 100 yard zero.
I don't really understand your comment. Increasing height over bore flattens trajectory. And your scope should be zeroed to whatever rifle your shooting.
 
I don't really understand your comment. Increasing height over bore flattens trajectory. And your scope should be zeroed to whatever rifle your shooting.
I do not believe that is mechanically correct. In order to compensate for the higher scope height above bore the bullet has to rise at a steeper angle which means that while the zero may appear flatter at distance, the mid-range trajectory will actually be higher rather than flatter.
 
While scope height may affect zeroing and your POI at various ranges, it will not affect your ability to shoot a small group at a given range, which I believe is what we're discussing here.
 
I do not believe that is mechanically correct. In order to compensate for the higher scope height above bore the bullet has to rise at a steeper angle which means that while the zero may appear flatter at distance, the mid-range trajectory will actually be higher rather than flatter.
If you have the hornady ap, alter you sight height from min to max watch what it does. I first found this out when competition steel banging rifles were the rage and they had special aluminum mounts like 4" over bore.
 
1 inch groups are more than acceptable for hunting.

Leave your rear rest, and bi pod at home someday. Forget sitting at a bench.

See how your groups are at 200 yards.

Compare your most accurate loads, and your worst ammo you have ever fired from the rifle.

You may be surprised by the results.
 
1 inch groups are more than acceptable for hunting.

Leave your rear rest, and bi pod at home someday. Forget sitting at a bench.

See how your groups are at 200 yards.

Compare your most accurate loads, and your worst ammo you have ever fired from the rifle.

You may be surprised by the results.
More accuracy never hurts.
 
In a perfect world you would pull your bolt out of the carrier, insert charging handle and carrier, then run back and forth ensuring the carrier slides back and forth w/o touching the gas tube at all.

My most accurate rifles don't touch.

I do have some that make contact and lift the gas tube a little while going into battery. They shoot pretty good. I have no way of knowing if this really makes a difference, or not though.

I have spent a LOT of time bending and fussing with gas tubes though. Sometimes having to replace them.

Sometimes the new one that shows up works perfect, and that was the problem. Different gas blocks can make the tube present slightly different also....

I just put an old rifle barrel together last night with some updated components. I was able to tweak the gas tube for around 15 min and get its carrier going back and forth with zero contact. I am anxious to see how it shoots.
 
So, I went with a bear creek side charger ar, 20" gunner profile, 416r barreled upper.

Aero precision lower, magpul prs light butstock, magpul k2 grip, cmg 2.5 single stage trigger.

Currently getting about inch groups at 100 with handloaded 95 vmax.

What have you all gained by shimming the barrel / receiver fit, or other tips and tricks to accurize an ar platform?
On all of my builds i lap the reciever face, and bed the barrel to the reciever with green loktite, i, as mentione above, prefer a clamp on style gas block.
I had a guy with accuracy issues with a built rifle bring it to me, went from shooting 3" groups to just over an inch just by lapping and bedding
 
my SA rifle started life as a mil-spec DPMS m4. over the years i swapped some things out such as the handguard, barrel, trigger, stock, grip.

i have a rock river arms 2 stage trigger, a wilson combat super sniper 20" barrel in 223 wylde that i had my local gunsmith install and he added one of those rubber accu-wedges.

that gun shoots 1/2 in groups at 200 yards from the bench when i do my part with federal factory 53 grain v-max.
 
I am sure somebody mentioned that your gas block can't contact your M-LOK assembly or the hand-guard.

If you are to use a clamp on gas block, you have to use a hand-guard with a larger diameter than most, or do a bit of work with a grinder.
 
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