
The noise generated by shooting a centerfire rifle indoors can make the experience kind of unpleasant. Not all indoor ranges are up to the task of dealing with .223/5.56. New shooters are also sometimes not happy with the noise and recoil of the .223. The 9mm might have the same recoil, but it has less noise. And the lowly .22 LR? Noise and recoil free. A 9mm or .22 LR make good sense in certain situations. Building one is pretty easy.
9mm
You’ll need a 9mm barrel and bolt, a conversion block for the magazine well (or a Rock River 9mm-specific lower) and a replacement buffer weight.
The 9mm barrel replaces the .223. The backend of the barrel is the same external size and shape, and the barrel nut is the same. However, since the 9mm is a blowback design, you won’t need the gas tube. You will see the stub of a gas tube on some of them, still attached to the front sight housing. It is there to keep the handguards from rotating and prevent the barrel nut from unscrewing. Yep, seen it happen. And since there is no need for a gas tube, the key on top of the carrier is there solely to keep the bolt correctly oriented. That’s why it is cut back on a slant.
Install the stock (most shooters opt for a telestock, which makes things easy) and lower internals just as you would any other build. The conversion block comes in two types: one inserted from beneath and held in place by the mag catch, the other from the top, held in by lips that keep it from falling out. Opt for the top-loading one.
Colt uses a pair of blocks pinned into the mag well. If you get a conversion set of parts like this, free or cheap, go for it. Make the top decks of the adapter blocks even with the top of the lower receiver, press hard forward and aft, and drill and pin. Otherwise, go for a 9mm-specific lower (Rock River makes one) or the blocks inserted from the top.

The barrel is installed like any other. Just keep in mind the need to secure the handguards or the barrel nut. A free-float handguard would be very good here.
The 9mm needs the heaviest buffer weight you can get. The H3 will work, if you can’t get a 9mm-specific Colt one. The 9mm uses the same buffer spring as any other carbine.

As mentioned, the bolt is a blowback type and machined without locking lugs. In fact, the carrier is the bolt — it is all one piece.

Last, you may find that some hammers are less forgiving of the 9mm bolt/carrier. If you use a standard .223/5.56 lower internals set, you may find the hammer is the problem. Swap it for a lightened, match-type one and things will work better.
The 9mm barrel has different threads at the muzzle than the ./223/5.56. The thread pitch there is ½-36, instead of ½-28. This is to prevent you from installing an undersized flash hider on your 9mm barrel. However, the ½-36 threads can cause headaches when you go to mount a suppressor. A handgun 9mm suppressor will have threads of ½-28, but that won’t work on your 9mm carbine.
That’s not a problem since the handgun suppressor mount features a booster, which the carbine doesn’t need. So, your suppressor needs a rear cap that is threaded ½-36. The 9mm bore explains why the handgun caliber barrel profiles tend to be heavier. Even at their thinnest, 9mm barrels are larger in diameter than 5.56.
9mm AR magazines are modified Uzi mags. Back in the old days we had the choice of a mondo-expensive Colt mag, or a dirt-cheap Uzi mag, requiring machining with an end mill. Now, there are plenty of 9mm magazines to be had, no need to go cutting on any.

.22 LR
A rimfire conversion involves only the upper, unless you find that the hammer is too heavy, a problem solved with a lightened match hammer. Also, the rimfire conversion does not need any specific buffer weight, as the .22 LR doesn’t generate enough recoil to push the buffer.
But you will need a buffer and spring installed, to keep the rimfire adapter in place.
The conversion is a bolt with built-in recoil springs and a forward part that looks like a .223 cartridge, lacking a bullet. That part fills the chamber of a .223/5.56 barrel.
This works kinda-sorta OK. The bullet of the .22 LR is made to fit a barrel with a nominal .221-inch diameter in the grooves, while a .223/5.56 is designed for a bore of .224 inches. That isn’t much of a problem, though the same can't be said of the barrel twist. A 1/12 barrel won’t be too bad, but a chrome-plated, 1/7 twist will be a roll the dice situation. Sometimes it works, and sometimes it is a disaster.
The better solution is to use a .22 LR-specific barrel. You can get these (and the conversion kits) from CMMG, among others. I’ve used the CMMG, so I can say from experience it works. Since the .22 LR does not need the .223-shaped extension, and is a blowback design, the .22 LR barrel protrudes into the receiver farther than the .223 barrel.
As a result, a .22 LR dedicated AR has an overall length closer to that of an M4 with a 14.5-inch barrel than a 16-inch carbine. It will be, generally, an inch and a quarter shorter overall than a regular carbine. But the rimfire still has a barrel 16-inches plus in length. If that makes a difference in the overall length (You never know, local and State law can be quite irrational) then you need to know before you build.
Barrel threads are normal ½-28 and regular rimfire suppressors will screw right on. Also, centerfire ones will too, but that’s asking for trouble. Rimfire runs dirty, grubby and ugly, quickly loading up your centerfire suppressor with powder residue and lead, making it less efficient and heavier.

As with the 9mm, the barrel nut is not locked in place by the gas tube (there isn’t one) so you will have to go to extra lengths to make sure it stays tight.
AR-style .22 LR magazines are shells of centerfire size, with a spring and follower inside to accommodate the little rimfire cartridges. They use the same mag catch as the centerfire.
You can build a complete upper or a dedicated rifle. To swap for a dedicated upper, remove the centerfire one, put on the rimfire and slap in the rimfire magazines. Done.
The Funny Plastic Thing
There is a plastic lump at the back of the shortened ejection port cover. You don’t really need it. Colt does that because they are locked into the slickside uppers for 9mm, and need it to deflect gas and brass. If you are using an upper with a built-in ejector lump, you can go with a standard door.
Editor's Note: This article is an excerpt from Gunsmithing the AR-15 — The Bench Manual.

There might be more than a few American shooters who are unfamiliar with the Aguila Ammunition brand. However, those that are know that the manufacturer, based in Cuernavaca, Morelos, Mexico and operating under Industrias Tecnos since 1961, produces quality ammo at relatively inexpensive prices. Luckily, in the course of the past few years in its partnership with Texas Armament & Technology (Tx-AT), its distributor in the U.S., Aguila Ammo has become more and more available to American buyers.
.22 Colibri and Super Colibri
.22 Supermaximum
.25 Auto FMJ
.30 Carbine FMJ
12-Gauge Minishell
.22 Sniper Subsonic
5mm RRM
.32 S&W Long
.32 Auto FMJ
.17 Aguila
One of the most important skills a hunter can have is the ability to track wounded game animals that have been hit. Obviously, the shooter generally strives for a clean, accurately placed shot that brings the animal down humanely and with a minimum of tracking required. However, for various reasons, this isn't always the case, and a hunter needs to be able to follow the animal's blood trail to locate it.
I’m old enough that, when I worked in law enforcement, revolvers were the only game in town. I carried a Colt Detective Special or J-Frame Smith & Wesson in .38 Special as my back-up gun and off duty gun. In later, non-law enforcement years, I often carried a Colt Magnum Carry or Smith & Wesson 340PD as my concealed carry gun. These are chambered in .357 Magnum. I like the power of the magnum cartridge because it maximizes performance from these short-barreled guns. A 2-inch barreled .357 Magnum will launch 125-grain bullets at 1,250 feet per second (fps), which is in the power range of a 9mm+P from a 4-inch barrel.
LCR cylinders are made from high-strength stainless steel and are extensively fluted to reduce their profile and weight. Ruger’s website states the cylinders are refinished with a durable, black Physical Vapor Deposition (PVD). But Ruger’s technical support told me, “We actually use a carbon based Diamond-Like-Coating (DLC), which is similar to PVD but has some subtle differences in application and mechanics. The hardness is around 3,000 Vickers, which is roughly equivalent to a high 80s HRC.”
The gun features a Hogue Tamer rubber grip that incorporates a very soft insert at the web of the hand to take the bite out of recoil. The cylinder release button (crane latch) has a heavy spring and requires some force to unlatch the cylinder. This is good for a concealed carry revolver because it is less likely to be accidentally activated from bumping something during concealment or when drawn.
For folks not familiar with the .327 Federal Magnum, don’t be fooled by its small caliber. It packs a punch. Nominal ballistics are a 100-grain bullet at 1,500 fps producing 500 ft.-lbs. of muzzle energy from a 4-inch barrel, which approaches the .357 Magnum’s prototypical performance of a 125-grain bullet at 1,450 fps producing 583 ft.-lbs. of muzzle energy from an equal barrel length. Thus, it delivers a super-charged bullet on target nearly on par with the .357 Magnum, a round recognized as one of the most effective self-defense cartridges available. The .327 Federal Magnum also produces less recoil than the .357 Magnum, which makes for faster follow-up shots. The .327 Federal Magnum achieves its impressive performance from a very high SAAMI maximum average pressure limit of 45,000 psi, which is considerably higher than the .357 Magnum’s pressure limit of 35,000 psi.
There is a nice range of bullet styles available for the .327 Federal Magnum. This includes hollow point, soft point and cast lead bullets. Ammunition manufacturers include Federal, Speer, Buffalo Bore, DoubleTap, Reed’s Ammunition and Jamison Ammunition. If you include the other calibers this gun will fire, the types of bullets available and the list of manufacturers increases significantly.
The DoubleTap load with the 115-grain cast bullet produced 1,264 fps and 408 ft.-lbs. of muzzle energy. This is awfully close to the power of a .357 Magnum when it launches a 125-grain bullet at 1,250 fps from a 2-inch barrel producing 434 ft.-lbs. of energy. Not all .327 Federal Magnum ammunition is loaded to maximum power, as the data in the table demonstrates, so shooters can select the round they feel will best suit their needs at the power/recoil level they desire.
Ruger LCR
A little less than one year ago today, Colt put on a media event at the legendary Gunsite Academy in Paulden, Arizona, where the manufacturer introduced a group of writers and editors to its new products for 2016. As someone who attended, I felt it was a pretty strong showing, particularly after some of the difficulties the company had faced in years prior. One of the most impressive firearms brought out was the Colt Competition pistol, a 1911 chambered in either 9mm or .45 ACP and built for speed.
Late in October, the popular ammo manufacturer Hornady announced what it is bringing out for the coming year. As usual, the company has several exciting new additions to its already impressive product lineup.
For a little while now, Springfield Armory has been teasing the release of a big new product on November 1, and today, things became official with the introduction of the new SAINT rifle. The Springfield Armory SAINT is the Illinois-based manufacturer's first-ever AR to hit the market, and it's important for a couple reasons: First, because it's Springfield Armory, and second, because it's not just another entry-level AR.
While I was able to put a lot of rounds through the two SAINT rifles I was provided for the event (probably a rough estimate of 600 to 800 rounds or so between both guns), I did not conduct any sort of official accuracy test for the rifles. Therefore, I can only offer some general first impressions on the SAINT and its performance, as opposed to a full-fledged review. (Editor's Note: Keep an eye out for a full review of the new SAINT in an upcoming issue of Gun Digest the Magazine).



Springfield Armory SAINT
One of the biggest trends in the firearms industry in recent years has been the development of more and more polymer-framed striker-fired handguns. What started many years ago with only a few manufacturers has now grown to include a large portion of the big name gun makers. In the past several years, even companies that haven't traditionally been involved with striker-fired guns have started developing and producing them.
To begin, the new Remington RP does indeed utilize a single-action striker-fired trigger, which has a trigger pull of 5.5 to 7 pounds. During my time with the RP9, I found that it broke fairly clean and crisp, and featured a pretty short reset. Both the break and the reset seemed consistent, and I had little problem hitting the steel targets the folks at Remington had set up at about 15 or 20 yards.
Specifications:




Once dried, I noticed two small paint runs, which were on the first two pieces I sprayed. This was a result of holding the spray nozzle too close to the part. Since the runs were basically unnoticeable, I left them as they were. Had I wanted to, I could have taken some 1,000-grit sand paper to the run spot and then touched up the area with more DuraCoat, but that was not necessary for this project.
New technology in the field of thermal imaging and night vision equipment helps bring cutting-edge, user-friendly technology to shooters and hunters.
A group of eight of us walked down the levy closest to the farmer’s barn, ARs slung across our chests. The whole world was an odd shade of shimmering green as our night vision goggles picked up infrared light invisible to the naked eye. If you’ve never used night vision goggles before, it’s rather like looking through a paper towel roll, and field of view is very limited. The thorn thickets to our right were punctuated with oval tunnels that had been cut into the brush by the hogs as they made their way to the rice fields for their nightly raids. There were several large openings in the brush, and we had been warned before the operation began that the pigs would charge toward those openings when the shooting started and would run directly into or over us as they escaped. This offensive mission could, at a moment’s notice, turn into a defensive shoot.
Night Vision Gear
Night vision technology can be incorporated into goggles as well as scopes. ATN is one of the leaders in night vision technology and offers a wide selection of goggles similar to the style we used in Texas for our hog eradication. But, increasingly, night vision equipment is being mounted directly on firearms thanks to advancements in technology that make this equipment lighter and more durable than ever before. An example of that is the new ATN X-Sight II, which is considered a “Smart HD” optic with an Obsidian II Core that is capable of being used in daylight, darkness, and can record still and video imagery.
That’s a lot of technology in one optics package, and that level of versatility makes lightweight rifle-mounted optics a great option for anyone who wants to shoot or hunt in both daylight and darkness. Mount this optic on your favorite .243 or .25-06 rifle and you’ve got a deer and antelope gun that can switch to night vision mode for hunting hogs and predators at night.
Thermal Imaging
The FLIR Scout that I used was so sensitive that I could point it out the window in the parking lot and determine how recently a car had been parked in each parking spot; in spaces where cars had just left, there was a dark heat signature indicating a low temperature because the rays of the sun hadn’t reached the asphalt for quite some time. Likewise, I could place my hand on the wall and the heat signature remained for several minutes. That level of refinement is amazing—and that’s only the tip of FLIR’s thermal technology iceberg.
Rimfire suppressors represent a cost-effective way to jump into the suppressor game, but there are some things to keep in mind if you plan on owning one.
Inflation has a factor in this but I don’t think I spent $18,000 on handgun shooting in any year, for everything, when I was a serious competitor. Granted, I was reloading all my ammo and building my own guns, but entry fees, travel, etc. didn’t add up to the tire cost for our neighbor. Shooting may cost, but not like really expensive hobbies.
Why do rimfire suppressors cost so much less? Materials – type and amount. A rimfire suppressor may be only a one-inch tube, instead of the 1.5 inches of a centerfire. Also, it will be made (in most instances) of aluminum, since the .22LR does not generate nearly as much pressure or gas as centerfires do. That all adds up to less material, which happens to be easier to machine, and thus lower cost. There’s also the smaller effect of economies of scale. If you are making a thousand of one item, and a hundred of another, you can bargain for lower costs on materials for the former.
Where rimfire suppressors make you pay is in the grubbiness department. Twenty-twos are pretty grubby just as they are. But when you start trapping the muzzle gasses via a suppressor, the carbon deposits become impressive indeed. Remember, there’s lead in there too, so wash your hands after you wash your suppressor.
The new Colt Combat Unit carbine was developed with input from legendary firearms trainers Mike Pannone, Ken Hackathorn and Daryl Holland, which together comprise the Colt Combat Unit. The Colt Combat Unit is a team of Sponsored Shooters and Product Advisors that Colt works closely with to develop firearms tailored to meet the unique demands of today's operators, law enforcement and civilian shooters.


Pink firearms and accessories have often been a topic of debate within the firearms industry. Some shooters like the idea of personalizing their firearms with pink accessories, while others either dislike the color or its marketing toward women. Regardless, because the preferences of different shooters are so varied, it's important for manufacturers to offer these types of choices. If a market for these sorts of products didn't exist, then neither would pink firearms and accessories.
The LaserLyte Pink Pearl V-MAG Grip Laser Sight uses an integrated Class IIIA laser, which activates easily and instinctively when the shooter holds the gun in a natural shooting position. This eliminates the need for any kind of extra motion by the shooter and permits quick target acquisition without requiring a typical sight picture.
LaserLyte Pink Pearl V-MAG Grip Laser Sight
![Best Concealed Carry Guns In 2025 [Field Tested] Wilson Combat EDC X9S 1](https://gundigest.com/wp-content/uploads/Wilson-Combat-EDC-X9S-1-324x160.jpg)


![Best 9mm Carbine: Affordable PCCs [Tested] Ruger Carbine Shooting](https://gundigest.com/wp-content/uploads/Ruger-Carbine-Shooting-100x70.jpg)
![Best AR-15: Top Options Available Today [Field Tested] Harrington and Richardson PSA XM177E2 feature](https://gundigest.com/wp-content/uploads/Harrington-and-Richardson-PSA-XM177E2-feature-100x70.jpg)
