HNPD FAS 604

ZHEC

Busy member
Joined
Aug 13, 2025
Messages
88
Reaction score
823
Location
Glasgow
Got this nicely boxed FAS 604 last week:LOL: — my first air pistol after receiving my AWC. It came with three weights but, sadly, no sight extension.

1776444154038.webp


This one appears to be a later version with a rounded top cover, rather than a sharp corner where cracks tend to develop on earlier models. I’d always thought this change only came with the FAS 6004… I was actually confused for a while and thought someone had swapped in a 6004 top lever, but I eventually found more photos online showing this rounded feature on later examples with serial numbers past 10,000. Hopefully this one will last longer, as I paid quite a sum for it.

1776444186107.webp


It has an adjustable palm shelf, but the grip is still too large for me, so I spent a few hours printing some customised palm shelves to get a somewhat better fit. Maybe I’ll print a whole grip someday when I’m in the mood for modelling (though that will probably never happen…).

1776444211357.webp


Next bit of tinkering was the sight extension. I modelled one based on the a few photo I found online, may not be an accurate replicate but it turned out to be a nice match. Solid enough and effectively takes the sight radius to about 13".

1776444235929.webp


Another thought came to mind later that day:unsure: why not hollow it out and add a few chambers? It might not be the most effective way to make a moderator, but it does seem to take the edge off the sharp crack a little. The first version looks like this below, 3D printed as a single piece, following the profile of a sight extension.


1776444800907.webp


To push it further, I expanded the chambers slightly in the horizontal direction to the width of lower frame. The overall volume is probably still smaller than the first chamber of a proper moderator, but it’s at least more useful than a dead-weight sight extension. Looks a bit ugly thoughHomer face palm.

1776444303361.webp

1776444321191.webp


It shoots 360ish with econ II and punches nicely at 6 yards and deadly accurate. Haven’t tried 10 meters but I’m quite happy for nowDancing banana
 
it would be a nice addition to the FAS 6004 but the dovetail is different as far as i know
I haven’t got a 6004, but I imagine it shouldn’t be too hard to model. Maybe I’ll get a 6004 one day as a daily shooter if a suitable one pops up, I don’t really want to abuse this lovely 604:LOL:.
 
Lovely looking later pistol, well done. And excellent work on the printed extension, looks perfect. The added baffles / spaces could be used to add weights if you wanted more muzzle weight. Personally I like the weight of the 604 as it is , but having the sight extension really does help with precision. HNPD
 
Lovely looking later pistol, well done. And excellent work on the printed extension, looks perfect. The added baffles / spaces could be used to add weights if you wanted more muzzle weight. Personally I like the weight of the 604 as it is , but having the sight extension really does help with precision. HNPD
I also prefer the it without any weight, so I’ve only used the lightest one to bolt the extension down.
 
Back
Top