SRU Precision Sruna-22
10/22 Bullpup Chassis
Review
If you are into guns, or maybe even if you aren't, you most likely have a Ruger 10/22. If you are like me, you can't leave anything in factory form. To help with that modification addiction, SRU Precision has their SRUNA-22 Bullpup Chassis for the 10/22 rifles and their clones. The Sruna-22 easily converts those 10/22's into a space age bullpup design.
I was looking for something different to do with a 10/22 that I had laying around. SRU had asked if I wanted one of the Sruna's to review. After using their SARB-15 AR bullpup kits, and liking it so much, I agreed. The Sruna's come in 3 standard colors: Black, Tan, and OD Green. However they currently have a limited edition White Sruna-22. I decided on the white one because it looks more like a space blaster than the other three. All of the Sruna chassis are the same, except for the color.
Now that you have decided on the SRUNA-22, what do you get? To start with, you get a complete exterior chassis that bolts on and around your 10/22. The Sruna separates into, essentially, 3 pieces for assembly and disassembly. You have the main aluminum piece that houses the barrel and receiver. The polymer trigger housing assembly with linkage. Then the rear quick release polymer housing. This rear housing enables you to quickly get to your 10/22’s trigger assembly. Allowing easy access for cleaning and maintenance.
The main aluminum housing of the SRUNA is where a lot of the utilitarian features come from. This is the section of the chassis that houses the barrel and receiver. One nice feature on the Sruna is that it will work with almost any 10/22 receiver. This includes billet machined as well as standard style 10/22 receivers. This also includes ones with or without a top pic rail. Plus it works with left hand receivers too. This housing also features a full raised top rail for mounting optics or sights on. I found using standard AR 1.5” mounts put an optic at just the right height. The Sruna chassis does drop down a little where your cheek rests. It also has a padded sticker that makes it more comfortable for your cheek. At the front are 5 M-Lok slots located at each of the 3, 6, and 9 o’clock positions. These are useful for mounting whatever. SRU also gave the Sruna 2 M-Lok slots, on 45’s, at the very rear of the chassis. Mainly so one can attach something like a QD sling mount. The top housing also has various cut outs to save weight and make it look “cool”. Warning, if you use any barrel length, or combination of muzzle devices and barrel, shorter than 17 inches, the muzzle will be inside the cut outs and M-Lok slots. I am running a 16” Shaw barrel in this one, and you can see in the pictures that it is just a wee bit short.
The trigger housing section of the SRUNA-22 is what makes this a really good bullpup chassis. SRU uses a sturdy trigger linkage system. This linkage system doesn’t flex much. That gives the user a really decent feeling trigger. The trigger housing system also includes a new trigger and safety. The safety allows you to keep the 10/22’s original push button safety on “fire”, because the Sruna trigger’s safety keeps the trigger from moving. The trigger housing has an extremely large trigger guard that houses SRU’s designed trigger. It is a flat polymer AR style trigger shoe with texture. I like the SRU trigger. The Sruna also uses an AR style safety. It comes supplied with a polymer one that matches the trigger’s style. I switched it out for a normal AR style one. So yes, the Sruna chassis will take most, if not all, AR style safeties. Including ambidextrous and different lever styles. It will also take a number of different style AR trigger shoes. Not drop in style, but the standard style, and just the trigger. Lastly, the Sruna’s trigger housing needs a grip. You have to supply the grip, but any AR style grip will work. I’ve had 3 different styles on this one. I ended up with a fairly vertical grip from Black Collar Arms. The vertical grip just seems to work better for me.
On the bottom rear of the SRUNA chassis is the quick release section. This section slides over your 10/22’s trigger housing and the Sruna’s trigger linkage. It has a quick release pin at the bottom rear. Just remove this pin and you can slide this piece down and off. Be careful, because the trigger pin might fall out of the linkage. It also houses the rear buttpad and spacers. When it is off, you have access to the original 10/22’s trigger housing so you can remove the whole thing for cleaning. The quick release housing goes on and off smoothly. It does have a little bit of misalignment with the trigger housing when installed. This doesn’t affect anything, it just looks a tiny bit odd.
The SRUNA chassis also has a few adjustment screws. I thought I would mention these as they align your barrel and receiver with the chassis. In the Sruna kit are these tiny set-screws. There are places on the chassis to install these. They slightly push on the 10/22’s receiver at the front, back, and bottom for alignment. They also help keep the receiver tight in the chassis. I just snugged them down and everything worked fine, I didn’t see any mis-alignment that needed adjusting on this one.
The SRUNA-22 bullpup chassis is fun. It shortens up a 10/22 and moves the weight toward the rear. This makes it easier to support because the bulk of the weight is between your hand and your shoulder. It also makes it swing faster between targets. I put a bunch of rounds through it and it does have a few flaws, but they are minor. If you run a larger charging handle on your 10/22, it may interfere with the Sruna chassis’ ejection port cutout. The stock charging handle works fine, but it sits in a little farther, making it harder to use. One with a longer handle, but similar profile should work best. I filed down a larger round handle to fit. The other flaw is that the return spring for the trigger linkage adds close to 1.5 pounds to the trigger pull weight. So it makes a good trigger not quite as good. I also wasn't keen on the chassis pieces not lining up. Now for good stuff. The accuracy out of the Sruna is just as good as your 10/22 was before sticking it in the Sruna. This chassis also takes some AR parts, making it customizable to some extent. I enjoyed my experience shooting the Sruna, plus it looks awesome.
If you are in the market for something different in the 10/22 world, the SRU SRUNA-22 Bullpup Chassis might be worth looking into. It does everything a bullpup should do, like shortening the overall length while still giving performance. It doesn't add a bunch of weight and it is just something you don't see everyday. Head on over to SRU Precision and check out the SRUNA-22 kit.
Firearms Insider Reviews - Key Points
Claim to Fame:
10/22 bullpup chassis system
Target Market:
Anyone wanting a bullpup style 10/22
Features, Benefits, and Specifications of this product:
Compatible with all 10/22 variants except take down version
M-Lok slots at 3, 6, & 9 o’clock
Full top rail
Overall Length: 26.3” - 26.7” (With an additional butt pad, extends to 27.1”)
Length of Pull: 14.3” - 14.75” (With an additional butt pad, extends to 15.1”)
Chassis Weight: 1090g (38.5oz) (Ruger 10/22 wood chassis is approx. 950g)
Handguard Inner Width Compatible with suppressors or muzzle devices up to 1.299” in diameter
Upper Handguard: 6061 CNC Aluminum
Lower Frame material: PA66 Polymer
Trigger Linkage: SUS304 Metal Sheet Stamping
Butt Pad material: TPU
Cheek Pad material: EVA
Quick release chassis system
Uses standard AR grips
What other aesthetic options or finishes are available?
Black, Tan, and OD Green
What others are saying?:
Nothing found as of publishing
Link to other reviews:
Nothing found on Real Steel version (10/22 not airsoft)
Price point:
MSRP = $399 - $419
Retail = Same
I need it now! Availability:
Our Rating:
Pros:
Good design
Takes standard AR grips
Works with left hand eject
Works with any 10/22 receiver
M-Lok slots
Full top pic rail
Cons:
Misalignment between two parts
Increases trigger pull weight
Screw height of top clamping screws
Some larger bolt handles may not work
Score: 7.00 Good
Favorite Link: SARB-15 Bullpup Chassis Review
