The Firing Line Forums - View Single Post - New To AR platform: rear sights? Sighting in? Same plane apertures? Bullet arc vs bullet weight?

Nathan · April 3, 2018, 05:37 PM

1) Basically, dual plane aperatures are std. they allow you to be more accurate up close when the small aperature is sighted to a 300 zero point.

2) For XM193 55 gr and a 16” tube, 50:200 works out close. You need and app like JBM Ballistics to figure out.

3) meh....what’s big? Yes, it will be different, it will depend on loads selected and how the barrel reacts to changing loads.

If you are shooting irons, you are giving up speed and accuracy for balance and weight...frankly, I would get a decent reds.

April 3, 2018, 05:37 PM	#2
Nathan Senior Member Join Date: July 1, 2001 Posts: 6,331	1) Basically, dual plane aperatures are std. they allow you to be more accurate up close when the small aperature is sighted to a 300 zero point. 2) For XM193 55 gr and a 16” tube, 50:200 works out close. You need and app like JBM Ballistics to figure out. 3) meh....what’s big? Yes, it will be different, it will depend on loads selected and how the barrel reacts to changing loads. If you are shooting irons, you are giving up speed and accuracy for balance and weight...frankly, I would get a decent reds.