i think ammo is expensive, i don thave on but i want one to SBR

THis is relevant to my interest so i am gonna TAG

Fun range toy. The ammo used to be expensive, but is about on-par by today's standards, and it still hasn't really changed since 2005: about 40 cents (USD) per cartridge of SS196 or SS195LF. In 2005 when 223 Rem / 5.56 was 10-20 cents a cartridge, 5.7x28 seemed expensive. In 2012 when 223/5.56 is about 30-40 cents a cartridge, 5.7x28 at 40 cents isn't that bad.

The recoil impulse is short and sharp, but it's almost like shooting .22LR.

The magazines are slow to fill up to 50 rounds, the mag changes are slow, the trigger sucks - it is essentially a really stiff super soaker trigger, and the scope height over bore is ridiculously high.

the weapon is like a bull pup so I expect that the trigger to be a little boggy like an Aug.

Some people seem to think so.

Barrowed from another site:

Gen 1: Black pack body, black hammer, OD green semi sear, auto sear present.
Gen 2: Gray pack body, black hammer, OD green or gray semi sear, auto sear present.
Gen 3: Gray pack body, gray or white hammer, gray sear, auto sear present.
Gen 4: Gray pack body, black, gray, or white hammer, gray sear, no auto sear. (As JHS mentioned, the hammer in a Gen 4 may actually be black but the defining characteristic is that there is no auto sear.)

As you can see, there are some variations, so the real evolution is defined by:
Gen 1 to Gen 2: Old, black P90 style pack body to the gray pack body. Some Gen 2s get the gray semi sear.
Gen 2 to Gen 3: Black hammer replaced with gray (or sometimes white) hammer and all semi sears are now gray.
Gen 3 to Gen 4: The auto sear is removed. With this change, FN apparently began to use a variety of internal color variations, but all semi sears will remain gray.

There also appears to be variations between generations with subtle changes in parts colors. Ultimately some people seem to think that paying more for a Gen 1 or 2 trigger pack is worth more money. Considering that a conversion to full auto by anyone other than a class 3 manufacturer will land you in Federal-pound-me-in-the-ass-prison, it’s pretty much irrelevant.

I've spent some time behind a P90 and while it is initially fun (especially when someone else is paying for the ammo), after a while in gets a little old.

gen 1 have a gray trigger pack serial number for genI is around 30000


genII have other color trigger packs - black,green,even white, I haveseen several colors but not grey.

both gen I & II would have the whote ringsite

the USG has theblack ringsight

after the USG was the rails or tri rails versions that is all that is avialable today.

ammo is around 40cents around ,my ps90 willshoot 2-3 inch groups a100 metersand 4-6 inchgroups at 200 bullet dropisaround 8 inches at 200 M and any wind will push theose little bullets around alot. 50 meter grouops of under 2" is the norm.

I Have taken turkey, yotes, racoons possums,and other varmits the tri rail isextermemley adaptable and especailly suited for mounting a red or green laser on.

My only complaint is the brass ejects strait down so get a brass catching bag otherwise I have hadbradd go into front button shirts, up shorts pants legs or down waistbands and it is very hot.