[amstel78]

Finally got a chance to zero my EBR today and noticed that I had to move the rear sight aperture up a lot higher to zero at 50 than before. I'm assuming that either the barrel is being pulled down in the Sage or my old stock forced the barrel upwards. Anyway, is it typical to have the rear sight aperture protruding slightly past the ears at 50 yards or is something amiss here?

 

[EBRbuilder]

Make sure that you don't have tension on the barrel whip control screw. It should just come in contact with the barrel and not exert any force on the barrel itself.

 

[amstel78]

Make sure that you don't have tension on the barrel whip control screw. It should just come in contact with the barrel and not exert any force on the barrel itself.

The whip screw is just touching the barrel. I made a conscious effort to stop turning it once it came into contact. I will back it out the next time I hit the range and see if my results differ.

On the plus side, my POI is much more consistent with the Sage stock over the synthetic piece; just surprised that elevation had to be moved up that far at 50.

 

[lurker01]

Mine was the same way. Adjusted the barrel whip screw, and that helped, but it seems the ebr lowers the angle on the gun a little.

 

[amstel78]

Mine was the same way. Adjusted the barrel whip screw, and that helped, but it seems the ebr lowers the angle on the gun a little.

How did you adjust the barrel whip screw? According to the manual errata, that screw isn't there to put downward tension on the barrel but to prevent excessive barrel whip. I'm hesitant to put pressure on the barrel with that screw but do find it odd that my rear aperture at 50 yards is where I would normally see it around ~100-175 yards. Dunno, just seems weird to me.

Glad to read though that I'm not the only one. Don't know if that's a good thing... GI3

 

[NoExpert]

It's the other way around... less draw pressure up front pulling the barrel down so your rear sight has to go higher. If the Sage was pulling the front down you'd have to lower the rear sight more.

Think of a level, if you have it showing level and you lower one side, you have to lower the other side to bring it back into level. Same thing happens with your sights.

 

[Big Gulp]

I can't get a good sight picture even with the cheek piece all of the way down. I haven't bothered to try and get the iron's zero'd. I had LASIK and my right (dominate) eye has been slowly getting worse. It went from 20/25 to 20/100. I need to get glasses until I can afford a touch up. Needless to say I cant shoot very well with iron sights passed 25 yards so I rely on my scope!

 

[lurker01]

How did you adjust the barrel whip screw? According to the manual errata, that screw isn't there to put downward tension on the barrel but to prevent excessive barrel whip. I'm hesitant to put pressure on the barrel with that screw but do find it odd that my rear aperture at 50 yards is where I would normally see it around ~100-175 yards. Dunno, just seems weird to me.

Glad to read though that I'm not the only one. Don't know if that's a good thing... GI3

I set mine to just barely touch the barrel and backed it off a tiny bit, so minimal tension. Excessive tension on the whip screw pushes the barrel down. This pushes the front sight down, and requires raising the rear sight to make up for it. It still seems like my barrel is angled down just a slight bit from the chassis, could just be an illusion. Maybe I'll stick a level on them...

 

[amstel78]

I'm wondering if the Sage op-rod block could actually be pushing the barrel upwards when the receiver is clamped down into the stock. This is the only other thing I can think of as I know the whip tension screw is just barely contacting the surface of the barrel.

Anyone else notice similar with SAI receivers or does this happen with all receivers?

 

[EBRbuilder]

Since the barrel is free floated from the op rod guide forward there is a small amount of droop induced into the barrel. This is most noticable when you add a sound suppressor. With a DC can it can change the POI up to 12 inches at 100 yards. Easy to account for once you have zeroed both with and without. In any case, it is really nothing to worry about.

 

[amstel78]

Since the barrel is free floated from the op rod guide forward there is a small amount of droop induced into the barrel. This is most noticable when you add a sound suppressor. With a DC can it can change the POI up to 12 inches at 100 yards. Easy to account for once you have zeroed both with and without. In any case, it is really nothing to worry about.

Good point.

Anyway, the irons are going to be relegated as a backup. As soon as I get my Sage DCSB, I'll either throw my LRS on it or pick up one of those cheapy 10X Bushnell Elite 3200s to try.

 

[amstel78]

Went back to the range after having received the barreled action back from SAI. Springfield replaced my barrel with a new one. Reinstalled everything into the Sage. At 50 yards, in order for POA to equal POI, elevation drum has to be moved approximately 21-22 clicks past bottom-out position. If memory serves, that only used to be maybe 7-8 clicks in the old stock. Still too much? Barrel tension screw again is just barely touching the barrel.

As such, drum is calibrated to the 2 mark at 50 yards, which should give me a rough 200-250 meter zero.

Probably a moot issue since the rifle will be scoped, but I am curious to know why this is happening. I'm wondering if my theory is sound in that the Sage block is actually pushing the barrel upwards slightly?

ETA: might have to pick up something like this and bottom the front sight post to compensate:

http://www.tech-sights.com/m14.htm

 

[amstel78]

Am I the only EBR owner having to dial that many clicks to get on paper at 50??