Review: Magpul MBUS Pro Offset Sights

[Guylee]

But if your gun is zeroed to your optic, your groups will be to the left at 25 yards because it will be POA/POI for the optic. Bullets will travel in whatever direction the gun is canted. They may be positioned over the bore, but since the bore isn't level, the bullet travels to the left.

[zimagold]

But if your gun is zeroed to your optic, your groups will be to the left at 25 yards because it will be POA/POI for the optic. Bullets will travel in whatever direction the gun is canted. They may be positioned over the bore, but since the bore isn't level, the bullet travels to the left.

I agree that when canting an optic that was zeroed in the vertical I would expect an impact shift both ahead of the first zero point (impact opposite cant) and down range of zero (impact direction of cant).

My thought was, these irons should establish a separate plane perpendicular to the bore and sight in like any other sight as long as the upper/handguard they are mounted on is parallel to the barrel and the sight plane is vertical. The only difference should be ergonomics of holding the rifle.

It wouldn't surprise me to find the barrel is a little off from being absolutely parallel with the upper and handguard, but I would have expected the error to be different between two rifles. It was the same in both cases.


Looks like I missed the Botach return period by 1 day. At this point, I think I am going to machine a shim for the rear sight and see if I can fix both problems: eliminate interference with VLTOR MUR upper and get the sight back in normal windage adjustment range.

[Guylee]

[QUOTE=zimagold;1828811

My thought was, these irons should establish a separate plane perpendicular to the bore and sight in like any other sight as long as the upper/handguard they are mounted on is parallel to the barrel and the sight plane is vertical. The only difference should be ergonomics of holding the rifle.

[/QUOTE]

You're right. I wasn't really thinking about that...

[zimagold]

I was planning on making a shim, but decided to use these offset sights on a different rifle and requested an exchange.

Went to the range tonight with the new set of sights. All is well. Sight in had no issues.

Targets at 50 yrds attached. Initial sightin, let the rifle cool, then shot a 5 shot group.

[zimagold]

Added summary to first post.