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:

SRU Precision

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

Faxon Firearms has been making quality barrels for some time now. They recently entered into the rimfire barrel market with their 10/22 barrels. Faxon has three different barrel contours to choose from as well as two types of fluting options. There are also three different coating options to choose from. I opted for the flame fluted standard profile in chameleon PVD.

The Faxon 10/22 barrel has a bunch of features not provided on the factory Ruger model. Most notably is probably the addition of Flame fluting. Faxon does a unique style of fluting as one of the options. As one can guess, the fluting looks like “flames”. If you get the “Chameleon” PVD coated barrel, the flutes are actually a different color than the rest of the barrel, which actually makes the flames look a bit more realistic. Since the barrel is PVD coated, the look of the coating will vary from barrel to barrel. This particular one is more of a lavender to blue fade with the flutes being a yellowish orange color. Some are more a blue to green fade. Fluting, both standard and Flame, provides better cooling of the barrel by providing more surface area for the barrel to give off heat. More important to me, is that on a rimfire barrel, it reduces the overall weight. In this case, the Faxon barrel is 0.4 lbs lighter than a factory Ruger 10/22 barrel. Faxon’s pencil profile reduces the weight by another 0.4 lbs, so a 0.8 lb reduction total. The Chameleon barrel sent to me weighs 1.4 lbs total.

When manufacturing the rimfire line, Faxon uses all the same quality materials they use in their other barrel lines. The Rimfire barrels are made from 416-R stainless steel bar stock, in Cincinnati, OH at the Faxon plant. The barrel is given 6 groove rifling with a twist rate of 1:16. The 1:16 is pretty standard for 22 rimfire barrels. They then cut a recessed target crown into the muzzle. The muzzle is also threaded ½-28” to a depth of 0.625”. A thread protector and spacer is also included. The spacer is to be used on muzzle devices that use the 0.400” depth instead of the 0.625” depth. Faxon rimfire barrels are also magnetic particle inspected for flaws and then heat treated and coated. Currently all of the Faxon Rimfire line barrels come in a 16” length.

When looking into 10/22 barrels, one typically finds “bull” style barrels. Faxon has those now too. But the standard profile is really nice if you're not into those “heavy” barrels. The Faxon Rimfire barrel has a tapered profile. It goes from 0.912” after the chamber down to 0.600” before where the muzzle threads start. This is pretty close to the Ruger’s standard barrel profile. The Faxon does fit in my standard 10/22 stock. It may not fit all of them, but it fits mine fine. Faxon also gives the Rimfire line a “Sporting” chamber. This gives the Faxon 10/22 barrels the ability to feed almost all the .22lr ammunition out there. I personally would have liked to see a slightly different chamber used, something like a “Bentz” for a little better accuracy. But I understand why Faxon went with the normal “sporting” chamber.

I ended up mounting the Faxon barrel to a stock Ruger 10/22 action. The barrel fit about the same as the stock barrel I removed. Meaning it slid into the receiver easily with little side to side movement. I then proceeded to mount it in an Enoch Deep-Six chassis. I opted for a chassis because I felt that a regular stock would not do the Faxon Chameleon barrel justice. The barrel looks really good mounted in the chassis. The chassis is also lighter than some wooden stocks, making this barrel/chassis combination very light.

After essentially making a complete different 10/22 than I had started with, I headed out to the range. Since ammunition availability is scarce, I rummaged through my stores of .22lr ammo. I found around 8 different types of plinking ammo, but no match ammo. I figured plinking ammo would be fine for this test. Especially since I don’t consider the Faxon barrel to be a true match barrel. Yes, the barrel is very high quality, it just doesn’t have a match chamber. I shot the various “cheap” 22lr ammo, through the barrel, at 50 yards. All but one of the major brands seemed to group around 1 - 1.5”’s at the 50 yard mark. I started with 5 shot groups and then moved to 10 shot groups. I was really pleased with how well the Faxon barrel shot. My factory barrel shot around 2 - 3” groups with these kinds of .22lr ammo. So as far as accuracy is concerned, I think the Faxon is good to go. If someone were to take the time and figure out which ammunition their barrel prefers, I would expect better results than what I had.

If you’re looking for something different in the 10/22 game, look into the Faxon Rimfire barrels. They aren’t necessarily cheap, but they are excellent quality and made in the USA. With all the different options, you can get extra lightweight, fluted, flame fluted, coated, etc. I’m very pleased with the quality of the barrel along with how it stands out from everyone else's boring barrels. Go give the Faxon Rimfire line a look if you’re building a 10/22 or just looking for something different.