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Hi Guys,

Just got my PS90 excited to SBR it. I know I have to do form 1. But I need advice on the hardware side. What brand and where to get the parts to make it a SBR.
 

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Congrats on the PS90. SBRing it will make a good thing way better.

As far as parts, you really only need a barrel and flash hider or thread adapter (to run a can). As far as barrels, there are three options that I'm aware of: have yours cut and threaded, CMMG and I think Stryker may still make one. There may be other options, but I haven't paid much attention since I did mine a few years back. I went with CMMG for the barrel and FH they have held up well so far for 5K+ rounds.

Check out this thread also: PS90 Barrel Swap (How To W/Pics)

I'm just sitting down to my first cup of coffee, so I may have left out something. I always do that.
 

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HK SD9 Tactical, if OP isn't interested in the barrel and flash hider, send me a message. This project is on my to-do list.

Joat
 

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I too did it myself with a CMMG barrel. There are some good YouTube vids on drilling out the blind pin.

Taylor Pickerell did barrel work for me on 2 of my sbr s
 

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The blind lock pin removal was a bit sticky, I used a 1/4 inch end milling bit in a drill press. Clamped barrel into a tool maker's vise and just cut away the barrel jacket behind the pin until I could see the outline of the pin. After that, you just punch out the pin and unscrew left pitch every thing. I highly recommend you get an inexpensive bicycle cone wrench, rather than grind down a standard wrench for the barrel. The dimension escapes me at the moment, but I think it's like 15mm at the breach.
IMG_3089[1].JPG
 

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Hi Guys,

Just got my PS90 excited to SBR it. I know I have to do form 1. But I need advice on the hardware side. What brand and where to get the parts to make it a SBR.
This first thing to get is the tax stamp. Otherwise, if you want to make sure you have a barrel buy one, or have yours cut down but keep it at a buddy’s house until you get the stamp. Thats what I did. You don’t want to possess the short barrel and the rifle without that stamp. Otherwise you might end up harvesting onions at the Federal Prison farm. Find someone to engrave your name and town on it after you “make” it.

Finally, be aware that CMMG barrels are threaded right hand, but real FN barrels have a left hand twist. Also, GSL of Jackson, MI makes a suppressor that’s very reasonable for the SBR.

It’s worth the wait and cost. The short barreled PS 90 is a blast!
 

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Finally, be aware that CMMG barrels are threaded right hand, but real FN barrels have a left hand twist.
CMMG barrels are LH treaded.

From the barrel tech specs:
10.4″
4140 Chrome Moly
Salt Bath Nitride Finish
1:9 Twist
5.7×28 Chamber
Threaded M12x1.0 LH

 

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Something must be wrong. They have only been taking 3-4 weeks for the last 4-6 months. I did one and it was 22 days, hell even my last suppressor was only 8 months.
I emailed someone from ATF a few weeks back and they said their working on June and July should be next. Maybe because its my first form 1 or the batch I was assigned too is slow.
 
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