Thinking about assembling a PS90

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Thread: Thinking about assembling a PS90

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    Thinking about assembling a PS90

    I am thinking about putting together a PS90 from parts using an Effen90 receiver. I do already have a SBR'd PS90 that I love, and understand how the rifle works. However I have a few questions/concerns.
    Parts I already have. Green stock, trigger pack, end plate, flash hider,
    Parts I need to order. Effen90 receiver, barrel (once my form is back), cocking handle, cocking handle spring, barrel lock, barrel lock spring, barrel return spring, and the moving parts assembly.
    MGW has everything except the barrel return spring(HDD has them), but they offer two versions of the moving parts assembly.

    I always thought that the full auto bolt assembly was the same as the semi auto version. Is there a reason to get one over the other? Is there a difference?

    Those of you that have seen the Effen 90 receivers, it looks like you can remove the side rails since they are held on with screws, can you confirm this?

    Are there directions anywhere on how to put the receiver together? When I removed my barrel last time I followed it out with a dowel. I was told it was really hard to get it all lined up otherwise. I have seen a parts diagram, but is there a tutorial posted anywhere?

    Any parts I missed?

    Anything else I missed?

    Any reason not to put one together this way? It probably isn't saving any money, but I already had the stock and trigger pack, and PS90's aren't in any of my local shops.

    Thank you,


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    Senior Member mugatu's Avatar
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    I am doing the exact same thing you are doing, and am at about the exact same spot in the process. It think if you bought all of the components directly from a retailer it would NOT save you any money at all. I think I will probably come in just under the cost of a new Standard PS90 and that is with lucky major breaks I’ve gotten on some parts and from very helpful members here giving me great deals.
    I would say that the wing rails on the Effen could be removed but I wouldnt go taking them on and off again too many times since it is aluminum and the mounting screws will be steel or something much harder than aluminum. Aluminum threads dont hold up too well over time if you keep doing that.
    Other than that, its probably pretty logical to put back together, or to put a new one together usig the Effen receiver. Do you still have your manual from your current PS90? It might say in there.
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    HK SD9 Tactical's Avatar
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    Cost is excessive. Sell the parts, buy a PS90 standard, sell the receiver and get the Effen receiver.

    I built my SBR with parts and even with all the deals I got, it still cost way more than I wanted it to, and way more than if I would have just bought a new rifle and started there.
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    I do have the manual, but it is no armorers manual, just shows basic takedown. I looked at a copy of the armorers manual online, and it has a good blown up diagram showing where everything goes, but is not super clear about what order you put the parts in. It looks like you would put the charging handle in first, then it's spring, then the button and it's spring, then feed the barrel through carefully and put on the flash hider and it's spring. I'm sure it is pretty intuitive, but sometimes there are a few tricks that make the process a lot easier. I have assembled tons of other rifles and there are lots of little tricks for pushing pins, lining up gas blocks and the like that I wish I had learned earlier. I would like to figure those out before I try to assemble it rather than after.

    I want to order it with the rails and then remove the one on the left side while keeping the right one for a light mount. I made a laser mount already that will mount to the polymer, so don't need the other side rail.

    Any insight on the difference in the moving parts groups? They look identical...
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    Quote Originally Posted by HK SD9 Tactical View Post
    Cost is excessive. Sell the parts, buy a PS90 standard, sell the receiver and get the Effen receiver.

    I built my SBR with parts and even with all the deals I got, it still cost way more than I wanted it to, and way more than if I would have just bought a new rifle and started there.
    I've checked all the shops near me and none of them have any in stock. One offered to order me one but wanted more than MSRP for a used one. I looked at grabagun, buds, sportsmans warehouse, etc... nobody has any.

    Do you know if there is any difference in the moving parts groups offered by MGW?
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    HK SD9 Tactical's Avatar
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    Rate of fire stabalizer.

    Don't know why you can't find a standard.
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    Senior Member mugatu's Avatar
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    I work at a gun shop in dayton and I can get a Standard for you if you want to go that route (if you are in the US). We have several in stock (finally).
    Last edited by mugatu; 10-21-2018 at 11:35 AM.
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    There is one at my lgs for 1249.00 it’s a standard
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    Thank you both, I will have to think about that and do the math. As I said above, I already have the stock, trigger pack, and end plate. I do also have the longer barrel from my other PS90 that I could have cut down to save a few bucks over buying a new one.

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    Senior Member aggie113's Avatar
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    As far as I can tell the moving parts groups are exactly the same. The weight doesn't even seem to be different. Others (fully licensed) have converted PS90's to select fire and haven't had to change it out. If you want a copy of the armorer's manual hit me up with a PM and I can email it to you.
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    Moo cow.

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