You must call Kel-Tec and ask if it's available!!!! Not griping at you, but people can call and ask for it.
 
Call Kel-Tec at 321-631-0068 (or 800-515-9983)  
Ask for SU-16E-652   Pistol grip AR stock adapter Kit  
 
The web site isn't always accurate or updated regularly, they are too busy with building guns!  
 
 
BamX2

Do you happen to know the price Bman?

Nice job defensivesolutions. I've been waiting a long time to customize mine. I've had it for around 5 years (+/-) and hadn't done a single upgrade to it before this week. It came to me with a scope and laser sight. Other than that, it's been bone-stock all this time. Finally got the bug to build though, and here's the before and after:
 
Before:

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After:

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Mods thus far are the Kel-Tec Compact Forearm and Pistol Grip assemblies, a Command Arms butt stock with buffer tube, a Command Arms adjustable cheek-rest attached to the butt stock and a UTG (Under The Gun) 5-Position Foldable Fore Grip. The butt stock has storage for 4 CR123A batteries, and the fore grip holds three of the same or two 18650's or AA's or a fairly substantial survival kit etc. etc. I think I will probably end up putting my Bore Snake in the fore grip and batts in the stock.
 
Mods still to go are a UTG bipod that I have on order and my Olight T20 Tactical flashlight mounted on a Command Arms 5-position-adjustable (for offset) rail mount and with pressure switch going down to the fore grip.  
 
I've always enjoyed this rifle. Now I'm downright in love with it! LOL  
 
If anyone can tell me how to remove the horrendously ugly front sight of this otherwise fine piece of American artistry, I would appreciate it. I would like to put a flash suppressor on it, but will live with it like it is if that would require a visit to a machine shop or something drastic like that.

Thanks for the Complement on my Kel Tec SU16 BluesStringer. I like the stock you added to your SU16. You also might want to purchase the metal front sight for your rifle. I took my plastic front sight off and added the metal one. You can purchase it off of Kel Tec's website. I've gotten a lot of my parts from Kel Tec and have also fabricated a few parts. But overall it's a fun little rifle to shoot and to upgrade. I'm actually running out of things to upgrade or add to my rifle.

Yeah, the front sight is coming off sooner or later. I don't have the tools at the moment to do it myself, but I have a good friend who's a top-quality gunsmith that I will call upon to thread the barrel for the compensator when I get it. I doubt removing the old sight will add to the price at all.
 
I am waiting right now for a pair of rails that I ordered to come in that will be installed per the mod described here.  
 
I will be mounting my Olight T20 Tactical flashlight to the right side of the new rails via this Command Arms flashlight mount. It's adjustable 180° left to right (or vice versa), and having 5" or 6" of rail front to back to adjust it will give me lots of flexibility to find just the right "sweet spot" for my sweet little spot! LOL
 
You can't see it all that well in the pics, but I've got a Beamshot-style red laser mounted on the barrel on the left side. Not sure yet if it will stay on the barrel or move to one of the 4 rails I'll have available. The pressure switch is kind of short and is Velcro'ed to the rail-base of the vertical fore grip right now, which isn't a bad spot, but I'd rather have it attached to the grip itself in the slot provided for it. Not really sure how that will work out with the flashlight pressure switch attached on the opposite side though. Just have to play with it and get my ergonomic groove on!
 
I will be attaching a sling swivel, or maybe just a stud, on the left rail and I'm also waiting right now for a 3-point Spec Ops Sling 101 to get here. I really wanted a 2-point sling, but I got this one for $10.50 shipped off an obscure eBay auction where the Seller had no idea how to tag his sale for the search engine to find it. The only tag he had on it was "Other!" LOL I get more useful stuff from more clueless Sellers doing obscure searches there! Anyway, if I can't either turn the new sling into a 2-point or comfortably adapt to the 3-point configuration, I'm not really out anything as I know I can get my money back on it and then buy a VTAC or similar.
 
Then the final mod I'm waiting on is a rail-mounted bipod, which will look great in pictures I imagine, but which I will likely not keep on the rifle all the time. I hardly ever used the stock bipod, but then again, it wasn't the easiest thing to deploy, nor the steadiest platform around. I might find that I just can't live without the new one, but whatever, it's small and lightweight enough to keep in either my rifle case or my BoB.
 
I'll post some more pics when it's all finished up. Hopefully everything will be here by this weekend. I will have to wait on the front sight/compensator mod, so that ugly thing will still be ruining my pictures! LOL No biggie. It's never been in my way. I use the scope exclusively anyway for regular sighting and shooting, and the laser works just fine for point-and-shoot exercises.
 
Thanks for the tips. Y'all take care.
 
Blues