FN PS-90 makes a decent PDW.

[NF1E]

Bought this little toy years ago and like the caliber 5.7x28 so much I had to add an FN Five Seven and an upper for an AR in the same 5.7x28. Fun to shoot and makes a great coyote rifle out to 300 yds. Whatta Hobby!

 

 

 

 

[shooterrex]

I was afforded the opertunity to shoot the full auto version  P90. Fun guns. Watch your footing on concrete with the gun dumping 50 rounds of brass at your feet. Yep I also had a 57 upper for an AR. Think I traded it for a different gun. Nice round.

[Armed Eye Doc]

I have the FN FixeseveN, AR57 and a PSA Rock.  All are good guns.  The AR is fun with a binary trigger.  I do not have a full auto bolt for it, so I can't use an FRT.  I would have gotten the short barrel version and modified the bolt to make it work with an FRT if Congress would have gutted the NFA.

[Armed Eye Doc]

4 hours ago, shooterrex said:

Watch your footing on concrete with the gun dumping 50 rounds of brass at your feet

The AR can use an empty AR mag in the mag well to catch the empties.

[shooterrex]

yep it can. the P90 not so much.

[NF1E]

Both the PS-90 and the P-90 can use a zippered cloth bag that attaches to the bottom of the pdw and does a great job of catching spent casings.