Just purchased a set of Magpul MBUS Gen 2 front and rear pop up sights for my rifle.
Getting the sights to slip over the rail was a chore. I had to use a soft hammer to persuade the sights to move into position.
Took a couple of tries on both front and rear sights to get the screw to align prior to tightening. Dry lube might make this process easier but I didn't think of it until after the cursing was done.
Here is some advice for those who are thinking of purchasing said sights.
1. Front sight - make sure the side actuating levers are positioned over the gas screw side cutouts to allow clearance to engage sight - Works as advertised.
2. Rear sight - there is insufficient clearance at bottom of the rail to have the sights pop up on their own. The sights attempt to pop up and then the side levers hit the top of the receiver.
There is insufficient spring tension to have the sights pop up by themselves. You will have to manually rotate the sight in order for them to lock in the up position.
A fair amount of force is needed to disengage the sights to retract them back to the stow position.
I am just in the process of cycling the sights manually in order to see if I can wear enough material to have them pop up on their own.
Ended up taking a toothpick a placing the smallest amount of silver anti-seize on the two bearing surfaces. This appears to have fixed the issue.
I will manually work the sights to "wear in" the surfaces so the sights will spring up every time - with authority.
Not a show stopper - just annoying.
L
Getting the sights to slip over the rail was a chore. I had to use a soft hammer to persuade the sights to move into position.
Took a couple of tries on both front and rear sights to get the screw to align prior to tightening. Dry lube might make this process easier but I didn't think of it until after the cursing was done.
Here is some advice for those who are thinking of purchasing said sights.
1. Front sight - make sure the side actuating levers are positioned over the gas screw side cutouts to allow clearance to engage sight - Works as advertised.
2. Rear sight - there is insufficient clearance at bottom of the rail to have the sights pop up on their own. The sights attempt to pop up and then the side levers hit the top of the receiver.
There is insufficient spring tension to have the sights pop up by themselves. You will have to manually rotate the sight in order for them to lock in the up position.
A fair amount of force is needed to disengage the sights to retract them back to the stow position.
I am just in the process of cycling the sights manually in order to see if I can wear enough material to have them pop up on their own.
Ended up taking a toothpick a placing the smallest amount of silver anti-seize on the two bearing surfaces. This appears to have fixed the issue.
I will manually work the sights to "wear in" the surfaces so the sights will spring up every time - with authority.
Not a show stopper - just annoying.
L
Last edited:
