I'm interested in getting electronic sights (or possibly a low magnification scope) for my Springfield XD 4" 45 ACP. I bought a picatinny rail from Sight Mount which replaces the rear sight. The picatinny rail has iron sights built into it, so I would like a sight that can quickly be detached from the rail if possible so I can use the iron sights as a backup. Does anyone have recommendations on which sights or scopes would be good for this pistol? I'm not worried about cost. Also, I'm going to be converting my .45 to be able to shoot .460 Rowland ammo, so considering that whatever sight I buy is going to be taking a beating from the slide movement, I really need something that's durable. I also have one last question. With the extra resistance on the slide from the picatinny rail, the sight and the .460 Rowland conversion, will target .45 ACP ammo still cycle reliably? Thanks for your time.