as i say i love my m9, tis beautiful. but the parts market fro upgrades seems rather limited, bought a broken one to fix up and improve mine and done some bits to it. so i have some parts thats why im thinking of it but then again i know what its like getting parts, and im not overly sure on comparability with other makes of m9(tm asg etc) so its more a collection thing, specially when you compare to my rifles which are all very different (tommy, m4, aug, super 90)so its as much a question to everyone else as to wither they with they had specialised or diverged looking back.