Shoot your AR-15 for pennies a round. NSPEC Innovations carries the .22LR parts that turn a centerfire rifle into a low-cost trainer and plinker: dedicated rimfire barrels with the correct twist rate, drop-in conversion kits, and .22LR magazines. Same stock, same grip, same optic, a fraction of the ammo cost.
There are two ways to get an AR-15 firing .22 Long Rifle, and the right one depends on whether you care more about cost and convenience or about accuracy. Here is how they compare, straight.
A purpose-built .22LR barrel with a twist rate matched to the light rimfire bullet (commonly around 1:16). Build it into its own upper and swap the whole assembly onto your lower.
A self-contained blowback bolt carrier that replaces your standard BCG and feeds from a rimfire magazine. Keeps your existing 5.56 or .223 barrel. Installs in a couple of minutes, no gunsmithing.
Whichever path you take, a .22LR AR-15 comes down to a few core parts. Start here and add from the matching subcategories.
The heart of a dedicated build. A rimfire-specific barrel uses the right twist rate for .22LR and delivers the accuracy a conversion kit cannot. Our 16-inch .22LR barrel is the foundation for a clean, accurate dedicated upper.
.22LR runs on a blowback bolt carrier, not the gas system. In a conversion kit this is the drop-in part that swaps for your centerfire BCG. In a dedicated upper it pairs with the .22LR barrel and a feed collar.
You need rimfire-specific magazines. They fit the standard AR magwell but have an internal follower sized for the small .22LR cartridge. Standard 5.56 magazines will not feed rimfire.
Round out the build with the same handguards, triggers and furniture as any AR-15. A dedicated .22LR upper can even skip the gas block and gas tube, since it runs on blowback.
A 5.56 barrel's fast twist is built for heavier centerfire bullets, so .22LR accuracy is only fair through it. A dedicated .22LR barrel (commonly around 1:16) is tuned for the light rimfire bullet and groups far tighter.
Rimfire cycling is picky. High-velocity .22LR generally runs most reliably, especially during break-in. Copper-plated rounds also help keep lead fouling down compared to bare-lead bullets.
.22LR is dirty. Kits and uppers that disassemble easily save time and last longer. If you run a conversion kit through your 5.56 barrel, clean the barrel and chamber well before switching back to centerfire.
Most .22LR AR magazines do not lock the bolt open on an empty mag. Plan to count your rounds, or feel for the click, rather than relying on the bolt catch.
Standard rimfire conversions are designed for direct-impingement AR-15s and are not compatible with gas-piston uppers. Check your platform before buying a drop-in kit.
There are two paths. A drop-in conversion kit replaces your standard bolt carrier group with a blowback .22LR bolt and uses a rimfire magazine, so you keep your existing 5.56 or .223 barrel. A dedicated setup uses a purpose-made .22LR barrel (and a dedicated upper) with the correct twist rate for far better accuracy and reliability. The conversion kit is cheaper and faster; the dedicated barrel shoots better and stays cleaner.
A conversion kit swaps out the bolt carrier group for a self-contained blowback .22LR carrier and feeds from a dedicated rimfire magazine. Because .22LR and .223 both use a roughly .224-inch projectile, the kit runs through your existing barrel with no gunsmithing and no permanent changes. Installation takes a couple of minutes: break the rifle open, pull the centerfire BCG, drop in the .22LR carrier and load the rimfire magazine.
Yes. A 5.56 barrel has a fast twist rate meant for heavier centerfire bullets, so accuracy with light .22LR is only fair. A dedicated .22LR barrel uses a twist rate optimized for the rimfire round (commonly around 1:16), which delivers noticeably tighter groups. A dedicated barrel also keeps rimfire lead fouling out of your 5.56 gas system.
Yes. .22LR AR magazines have a centerfire-size body that fits the standard AR-15 magwell but an internal follower and spring sized for the small rimfire cartridge. Standard 5.56 magazines will not feed .22LR. Note that most .22LR AR magazines do not lock the bolt open on an empty magazine.
Ammo cost is the biggest reason. .22LR is far cheaper than 5.56 or .223, so you can train longer for less. Recoil and noise are minimal, which makes it excellent for new shooters working on trigger control and sight alignment, and it keeps the same stock, grip and optic as your primary AR-15 for consistent training.
It can. .22LR is dirty and uses lead bullets, and running it through a standard gas-operated 5.56 barrel can leave lead fouling near the gas port over time. A dedicated .22LR barrel avoids this because it operates on blowback and does not route rimfire fouling through your centerfire gas system. If you use a conversion kit, clean regularly and use high-velocity ammo for the most reliable cycling.
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