Grendel group

[VASCAR2]

That doesn’t sound normal. I would ensure the hand guard or attachments are not hitting the gas block. I’d also check the barrel nut to see if it is tight. I’d also check to make sure the flash hider, compensator or thread protector are not loose. Also look at the flash hider or muzzle brake to ensure the bullets are not hitting the muzzle device. If the bore is not centered in the barrel or the threading is not square you can encounter bullets hitting muzzle devices. I’d also check to ensure the scope is tight, rings and mount to the rail.

I’ve seen scopes go bad and if everything is tight I’d try a different optic.


Remember on an AR-15 your scope is 2.5” to 2.75” over the center of the bore which comes into play with down range ballistics. With more traditional bolt action rifles where the center of the scope is 1.5” over the center of the bore you would sight in 1.25-1.5” high at 100 yards so your shots would hit on medium size game out to 250-300 yards.

To get an AR-15 to shoot 1.4” high at 100 yards I used a 45 yard zero. The biggest concern I have is that your rifle was 6.5” right. The 5.5” inch low doesn’t sound to far off the ballistics I got using the Hornady ballistic calculator.


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