Put your cheek on the same spot is helpful. Want to zero at 100 yds.
An AR15 with iron sights should be able to get on paper at 200 yds ... unless your eyes are old .. and a sight helps.
I got a 12 x 50 scope ... pew pew pew right on target. And it was a hundred dollar scope.
My AR in 7,62 I built over the winter needs to go out to the range. The mags are very tough to get all rds loaded ... I took one and modified the spring length.
It will be interesting to see if double feeds happen with the non-mod mags v. the modified ones.
A bore laser sighter is a good investment ...
Next build: AR10, 16" ... Armalite v. DPMS is my head scratching decision. I can get a complete upper for $600 new .. and I would build the lower from a 80%, either forged or billet.
Mucking around with cast AR15 80% lowers now....
And have you seen the AR-crossbow from PSE? http://www.ebay.com/itm/like/331200258962?lpid=82
Sweet. Gotta get one ... I have a recurve and compound .. never interested in a crossbow until I saw this.
Maybe a 308 bolt action AR15 ....