Why have the rear sight as far from the front as possible?

[M16LR.50]

I might buy one with two apertures.

Your XCR did not come with the MI sights? I thought they were standard on all later model XCRs...

 

[Canadiankeeper]

Your XCR did not come with the MI sights? I thought they were standard on all later model XCRs...

troy industries

 

[lone-wolf]

where could I source a smaller aperture ?

I don't see any after a quick google for what I assume is your model, but I'd contact troy directly and see what they have to say.

 

[Canadiankeeper]

So, figured out the sights. After a long few range days and lots of ammo... With iron sights, my worst group at 100 yards was 4.5 with norc surplus 556. Down to a 2.3 with American Eagle 223 AR. Shooting with iron sights. Im sure all this groups will come in a bit with a good optic. As far as im concerned average grouping size is 3 inches with iron sights at 100... im a happy camper... After all, iron sights aren't the easiest at 100 yards for making tight groups... After a total of 3 range trips and about 400 rounds, this was the third trip and did a complete take down. Any one have any good ways to clean inside of gas tube ? Should I pick up one of those cheap Canadian tire cleaning sets ?