Hey everybody, I just shot my new 6.5 Grendel upper for my AR15 today.
At 25 yards it shot 5 (I shot more than one because I was just interested in seeing it run) through a quarter right under the bullseye. I was supprised because I just slapped on the mount and the scope, adjusted for eye relief, leveled it and torque it down.
Jumped up to 100 yards. First group was about 1 inch 5 shot, 4 inches high or so, went down 16 clicks. Shot a 2 inch wide 3 or so inch tall group around the bullseye. Figured I was rusty/exicited and needed to relax. Shot my .22 for a bit.
Shot another group that looked like the prior one, switched ammo. Same thing. Decided that the scope was not holding zero, whacked it sharply but not too hard on the top of the tube with a rubber screwdriver bit set (couple ounces). Now the groups are huge and like 4 or 5 inches low. I've used this whack the scope and shoot method before to condem a wandering scope erector in the past. So im pretty much sold on the scope being bad.
I also tried single shot loading because I've seen people complain ar15 grendels mangled the long skinny tips. Made not difference, its all over like a loose ring. As I fired it more It did trend back up toward the prior zero but was still shotgunning.
Everything is tight, hand guard is free floated.
Ammo was horady American gunner 123 then the hornady black box 123.
I emailed Vortex about the scope. Its a viper, PN VPR-M-05BDC
Bought that scope in 2015 but never used it till this year.
I purchased a rifle length Grendel upper used this scope and it grouped so poorly, I returned it. Having a bore scope I gave it a peak and decided that...
1. There was a huge burr on the crown
2. There where flattened rifling edges and longitudinal scratches
I condemned that upper, got a refund and build this new one.
Does it look like the scope is the issue to you all?
At 25 yards it shot 5 (I shot more than one because I was just interested in seeing it run) through a quarter right under the bullseye. I was supprised because I just slapped on the mount and the scope, adjusted for eye relief, leveled it and torque it down.
Jumped up to 100 yards. First group was about 1 inch 5 shot, 4 inches high or so, went down 16 clicks. Shot a 2 inch wide 3 or so inch tall group around the bullseye. Figured I was rusty/exicited and needed to relax. Shot my .22 for a bit.
Shot another group that looked like the prior one, switched ammo. Same thing. Decided that the scope was not holding zero, whacked it sharply but not too hard on the top of the tube with a rubber screwdriver bit set (couple ounces). Now the groups are huge and like 4 or 5 inches low. I've used this whack the scope and shoot method before to condem a wandering scope erector in the past. So im pretty much sold on the scope being bad.
I also tried single shot loading because I've seen people complain ar15 grendels mangled the long skinny tips. Made not difference, its all over like a loose ring. As I fired it more It did trend back up toward the prior zero but was still shotgunning.
Everything is tight, hand guard is free floated.
Ammo was horady American gunner 123 then the hornady black box 123.
I emailed Vortex about the scope. Its a viper, PN VPR-M-05BDC
Bought that scope in 2015 but never used it till this year.
I purchased a rifle length Grendel upper used this scope and it grouped so poorly, I returned it. Having a bore scope I gave it a peak and decided that...
1. There was a huge burr on the crown
2. There where flattened rifling edges and longitudinal scratches
I condemned that upper, got a refund and build this new one.
Does it look like the scope is the issue to you all?