I recently picked up one of these and it was fairly cheap despite being in good nick and in one of my local gunshops because it had an unattractive child's grip on it. Which is cool as my unattractive child will at some point get to use it .

Thanks to Nige on here, it now has a nice large adult grip with adjustable palm shelf. So I can use it too .

It's an early (4-digit serial) Mk1. Haven't put it through its paces yet, but I think I like it. Nice trigger for one thing.

Any advice, hints or tips?

In particular:

- do the BAR seal kits for the 6004 fit the 604?

and

- the sights are big and blocky. Which is probably fine, but are there different front and rear blades available?