I ‘ve heard the 1200 meter 3 gen rear sight is nice. But you would need the bipod. They have a nice retractable bipod that fits into the front handguard. You might be able to get a hk brass catcher for one, with a lota luck. But it still has hk roller quality thats hard to beat. Worth the money.
And I forgot to mention, there are hk 5 round steel mags.