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From what I've learned here there is no difference in the base carbine, the only thing that separates the generations is the trigger packs. If you're buying new then it'll be a Gen 3 or Gen 4 depending on the trigger pack.
 

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From what I've learned here there is no difference in the base carbine
Well actually there have been differences. He's asking about the latest version of the rifle, which is the standard, not the generation of the hammer packs.
 

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Sequential generations of trigger packs did not get 'better', but they simply evolved to be further away from the full-auto pack to make conversion to something illegal more difficult. So people who secretly want to be 'bad-boys' will label them as 'collectible' and flaunt that they have a 'Gen I' to justify that they are asking for or paid extra money.

For pure functionality, there is no difference.

Sequential generations of the rifle do have minor differences, and I am not expert in what they are, but for instance mine has a cast receiver, I have seen people talking about billet receivers, which I assume are older generation. In this case, I'd say older is 'best' and the newer did not get better, but got cheaper. There also seem to be differences in the sights - rail only versus co-witnessing, versus whatever. Like I said, I'm less familiar with these differences.
 

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Been looking on Gunbroker for PS90s and I need to know what to look for to make sure I'm getting the latest version of the gun. Any help is appreciated!
I was implying latest generation. Assuming the Gen 4 Trigger pack is the best?
Right now, FNH is still assembling many PS90s with the Gen 3 trigger pack (hammer pack).
FNH still has many Gen 3 pack still in stock and will continue to assemble current PS90s with them until their supply of Gen 3 packs are exhausted.

There are some Gen 4 hammer packs being installed in PS90s today, but currently, I believe those are rare.
Once FNH no longer has anymore Gen3 packs to use, all new PS90s from that time forward will have the Gen4 installed.

The only way you can tell if a PS90 has a Gen2, Gen3, or Gen4 pack is to take down the rifle, take the pack out, and look at it and compare it to the link that JHS 27275 posted in post #9.

Hammer(Trigger) pack sticky
 

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Sequential generations of the rifle do have minor differences, and I am not expert in what they are, but for instance mine has a cast receiver, I have seen people talking about billet receivers, which I assume are older generation. In this case, I'd say older is 'best' and the newer did not get better, but got cheaper. There also seem to be differences in the sights - rail only versus co-witnessing, versus whatever. Like I said, I'm less familiar with these differences.
From the factory, I believe all P90s and PS90s, regardless of the hammer packs and/or the rail/optics options, are all cast receivers.

All the machined receivers (billet receivers) I have been able to find are all aftermarket.

But if FNH made billet receivers, I defo would like to buy one.
 

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I do not know the heritage, so the my understanding of the cast vs billet choices are not based on researched fact. In my comments, I was not trying to say FN made both. I assumed they did, but then again, I did not know that after market receivers even existed. I am a total newbie to the PS90/FS2000 games. I only got in to see if I could develop a 2-stage trigger (and I think I can), but everything else about the rifle is a total unknown to me.
 

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FNH P90/PS90 receiver's are cast.
 

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Yes, the tri-rail is lower. The current standard model has a removable adjustable rail.
 
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