The Firearm Blog

taofledermaus has published a video tutorial on how to fit a Ruger 10/22 receiver, trigger and barrel into a $30 airsoft P90 stock and how to hook up the airsoft trigger to the 10/22 trigger at the rear of the stock. A very clever idea.

I blogged about the new AR57 earlier this year. The AR Five Seven is a one piece 5.7×28mm upper that attaches to a AR-15 lower and uses the 50 round FN P90 magazines. 57 Center posted a few photos of their new SBR suppressed submachine gun/PDW:

How cool is that!

UPDATE: After writing a three paragraphs about integrally suppressed firearms it turns out this is not integrally suppressed! The suppressor fits inside the handguard. I got this via. email from the 57 Center:

This particular AR57 PDW Upper in Full-Auto with 6″ Barrel, with 6.5″ Gemtech Suppressor, is currently being produced for a couple LE Agencies.

We currently have our 11″ Pistol/SBR Upper available as well as our standard 16.125″

So they are now directly competing with the full-auto FN P90. Personally, if I had a choice between this and the P90 I would go with the AR platform.

I think the pistol configuration could be a lot of fun.

UPDATE: I asked if the 6″ barrel gave adequate performance. From 57 Center:

We have excellent results with both 6″ and 11″ Pistol/SBR Barrels, this would be peoples choice, LE prefers 6″ with the 6.5″ Suppressor, this unit also works in Sub Sonic,

It is very impressive that the action can cycle subsonic rounds (a light 30-50 grain 5.7mm bullet traveling below the speed of round is comparable to a 40 grain .22 LR Standard subsonic round).

This is very interesting. A one piece 5.7×28mm modular upper that attaches to a AR-15 lower receiver and uses 50 round FN P90 magazines.

TrueWPN at AR-15.com took these photos. Click to expand.

Well this thing is interesting. Its a AR-15- PS90 cross bread. The one piece modular upper snaps onto any AR-15 lower. Allowing you to fire 5.7×28mm with the PS90 50 round mags. I added HK 416 rifle sights. I wanted to use the LaRue Tactical Aimpoint mount in the picture but I think the sight may stick out to far to mag change:( we will see. I just used a DPMS complete lower with a Magpul grip and stock. It has a right side charging handle. The upper and lower color match perfect. I am really impressed with the quality.

It still has the bolt open feature like the AR-15. It does utilize the buffer tube with the stock AR spring and a Heavy buffer that came with it. It ejects the spent cases through the mag well. I had a cheap 30 mag that was no good so I gutted it and cut the top off so it will work as a funnel for the spent cases. I purchased the Upper from www.HKSpecialist.net who shipped and I received it over night. Great guy to deal with. Unfortunately I can’t find them for sale anywhere else and I got the only one Gordon had left. The Manufacturer’s web sight is www.57center.com . I put 150 rounds down the pipe today after work with out a hitch. Really sweet accuracy at 50 yards open sights. And it was easy to engage multiple targets with no recoil throwing me off. I cant wait to put a optic on it. I am leaning towards a Aimpoint Micro T-1. Enjoy the pics…………………

The 5.56mm AR magazine is not used.

These photos are from the 57 Center’s website.

Hat Tip: Defense Tech