Go here and ask, they'll tell you even more than you thought you wanted to know:

www.rimfirecentral.com

Oh, BTW, go check out the Sights & Optics forum on the AR15 forum here. I posted some nice things about your offset AR15A2 peep sight.

Robert,
    I bought those two 10/22 barrels from you awhile back and relined them -- one is in 17 Aguila and the other is in 17 Mach2. The 17 Aguila is a little easier to set up in the 10/22 than the Mach2 round but both shoot really nice. I have not tried the Aguila chambered barrel at the range but the 17 Mach2 will easily shoot .5" at 50 yards (I use a 3x9 scope) but it did take a little extra work to make it shoot right. These 17 caliber rimfires seem to be very accurate -- maybe due to the class of bullet being used.

If you were thinking about trying the Mach2 you can get a ready made barrel and heavy bolt handle from a company named EABCO at www.eabco.com/hornady17hm2.html -- they start at $159 and I think this is about the cheapest setup you can get.