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The Buck Mark has been one of the most trusted names in rimfire pistols since 1985, and this Micro Bull RMSc version is one of the more exciting configurations in recent memory. It starts with the same foundation every Buck Mark is built on: a frame precision-machined from billet aluminum alloy, a hand-reamed chamber, and a recessed target crown on a steel bull barrel. Add in the FDE rubber-overmolded UFX ambidextrous grips and the matte blued finish, and this pistol has a look and feel that stands out from the typical .22.
The integrated RMSc footprint on the slide lets you drop on a micro red dot without any additional adapter plates or machining. That said, the iron sight package holds up on its own: a green fiber-optic front sight paired with a Pro-Target adjustable rear that offers 16 clicks per revolution, which is a noticeably finer level of adjustment than most pistols in this price range. Whether you're running it with a dot or keeping it stripped down, the sighting options are genuinely good.
The 4.4-inch bull barrel is threaded 1/2×28 TPI and ships with a thread protector already installed, so it's ready to go the moment you put your hands on it. The bull barrel profile adds a bit of forward weight that steadies the pistol nicely during slow fire, and the straight blowback single-action design keeps things simple and reliable. The 10-round steel magazine uses a coil spring design rather than a Z-spring, which helps with long-term feeding consistency. Controls are intuitive: large thumb safety on the left side, mag release adjacent to the trigger guard, and slide cocking ears at the rear of the slide that make racking easy for all hand sizes.
The Buck Mark Micro Bull is a well-rounded rimfire that works great for target practice, new shooter introductions, small game, or as a host for a suppressor build. At 29 ounces with an 8-inch overall length, it's compact enough to handle comfortably but has enough heft to keep it stable on target.
The slide is machined with an RMSc (Rifle Micro Sight, compact) footprint, which is a popular standard used by Sig Sauer, Holosun, Leupold, and several other manufacturers. Many micro red dots drop right in without any adapter plate. Just confirm your chosen optic lists RMSc as a compatible footprint before buying.
It's one of the better options in the rimfire pistol category. The barrel is already threaded 1/2×28 TPI and ships with a thread protector, so you can mount a suppressor as soon as you have one in hand. The bull barrel's added weight also balances out nicely once a suppressor is attached, and the straight blowback action cycles reliably with standard and subsonic .22 LR loads.
The Buck Mark platform has a strong track record of feeding a wide variety of .22 LR ammunition, from bulk pack to higher-end match loads. Standard and high-velocity copper-plated rounds tend to run especially smoothly. Like most .22 semi-autos, some wax-coated or particularly dirty budget loads may require more frequent cleaning to keep things cycling reliably.
The Pro-Target is Browning's standard adjustable rear sight and it offers 16 clicks per revolution for windage and elevation adjustments, which gives you a finer level of precision than most pistol sights in this category. It pairs with the bright green fiber-optic front sight to give a crisp, easy-to-pick-up sight picture under most lighting conditions.
This specific model (MPN 051609490) was introduced as a 2026 SHOT Show Special and adds the integrated RMSc optic footprint machined directly into the slide, along with FDE rubber overmolding on the UFX ambidextrous grips. The standard Micro Bull variants typically use a Picatinny rail or no optic cut at all, so this version is purpose-built for those who want a red dot mounted low and direct to the slide.
Yes, the Buck Mark is well known for being relatively straightforward to field strip compared to some competing rimfire designs. There are no small detents or pins to lose during basic disassembly. A basic cleaning after each range session keeps it running well, and the hand-reamed chamber and recessed crown help with consistent accuracy long-term.
| UPC | 023614871446 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | 051609490 |
| Action | |
| Barrel Length | 4.4" |
| Caliber/Gauge | .22 LR |
| Capacity | 10 + 1 |
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