Wouldn't it be nice if this sight had a search feature-
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It does! It's in the light grey bar under "Armory". (It's been back for a while now. [;)])
The only M4 I could find on their site (as a complete rifle) was this one:
[url]http://www.bushmaster.com/shopping/weapons/pcwa2x14m4my.asp[/url] Unfortunately it has the Mini Y Comp.
If they offered you a 16" option w/o a comp, like this:
[url]http://www.bushmaster.com/shopping/uppers/post-ban/pura2b16m4.asp[/url] then it should have been available with either the A2 sights or a flat-top. An A3 receiver is listed as an option for this upper.
I don't know why the have separate "items" for the M4A2 & M4A3 uppers with 14.5" and comps, but a combined "item" for the 16" w/o the comp. Or why they list the 16" as an upper-only but not as a complete rifle.
I'd go with the 16" w/o comp myself. If you want the 14.5" I'd follow boggl's recommendation and replace the Mini Y Comp with anything else.