Description
The Buck Mark has been one of the top names in rimfire pistols since 1985, and this Micro Bull SR variant shows exactly why the platform keeps earning repeat customers. It starts with a 7075 aluminum alloy frame that's precision CNC-machined from billet stock, keeping the overall weight at a comfortable 29 oz while maintaining the kind of structural integrity you'd expect from a target-grade pistol. The straight blowback action is about as simple and reliable as it gets, and the gold-plated single-action trigger breaks cleanly without a lot of fuss. The barrel is hand-reamed and features a recessed target crown, which goes a long way toward consistent accuracy.
Buck Mark Micro Bull SR: Built Around the Bull Barrel
The 4.4" steel bull barrel is really the heart of this pistol. The added mass up front keeps muzzle movement minimal and helps the gun settle back on target quickly between shots. It also ships with 1/2×28 TPI suppressor-ready threads and an included thread protector, so if you're planning to run a can, this pistol is ready without any additional work. The RMSc-cut receiver lets you mount a micro red dot directly to the slide without a separate adapter plate, and with a 6.5" sight radius on the iron sights, it's no slouch in the accuracy department running irons either. The green fiber-optic front and Pro-Target adjustable rear sight give you a bright, snappy sight picture, with 16 clicks per revolution of adjustment for dialing things in precisely.
Grip, Controls, and Everyday Ergonomics
The UFX ambidextrous grips feature rubber overmolding with finger grooves on both sides, which consistently puts your hand in the same position every time you pick it up. That repeatability matters, especially if you're running drills or shooting Steel Challenge. The magazine release sits right next to the trigger guard for easy access, the slide has built-in recesses and raised side panels for a solid grip when racking, and the manual thumb safety is big enough to actually use without hunting for it. At 8" overall and under 2 lbs, the Micro Bull SR carries and handles like a pistol significantly smaller than its feature list suggests.
Key Specifications
- Manufacturer: Browning
- Model: Buck Mark Micro Bull SR
- MPN: 051608490
- UPC: 023614871439
- Caliber: .22 LR
- Action: Single-Action Semi-Auto (Straight Blowback)
- Capacity: 10+1
- Barrel Length: 4.4"
- Barrel Type: Bull Barrel, Threaded
- Thread Pattern: 1/2×28 TPI
- Overall Length: 8"
- Weight: 29 oz (1 lb 13 oz)
- Sight Radius: 6.5"
- Front Sight: Green Fiber-Optic
- Rear Sight: Pro-Target Adjustable
- Optic Cut: RMSc Footprint
- Frame Material: 7075 Aluminum Alloy
- Barrel Material: Steel
- Finish: Matte Blued
- Grips: UFX Ambidextrous Rubber Overmold
- Safety: Manual Thumb Safety
What’s Included
- Browning Buck Mark Micro Bull SR pistol
- 1x 10-round steel magazine
- Thread protector (1/2×28 TPI)
- Pistol rug (zipper closure)
Frequently Asked Questions
Is the Buck Mark Micro Bull SR a good suppressor host?
It's one of the better options in the rimfire pistol category for that role. The 4.4" barrel comes threaded 1/2×28 TPI right from the factory with a thread protector included, so there's nothing extra to buy or machine. The bull barrel's added weight also means the balance stays solid when you attach a can, and the low recoil of .22 LR is already well-suited to suppressed shooting with subsonic ammo.
Does the Buck Mark Micro Bull SR come with a red dot optic?
No, the optic is not included. The receiver is machined with an RMSc footprint that allows direct mounting of compatible micro red dot sights without an adapter plate, but you'll need to purchase the optic separately. Popular choices among Buck Mark owners include the Holosun EPS and Sig Romeo Zero, both of which use the RMSc footprint.
How does the Pro-Target rear sight work?
The Pro-Target is a fully adjustable rear sight that clicks in 16 increments per full revolution, which gives you finer windage and elevation control compared to most factory adjustable sights. It pairs with a green fiber-optic front post for a bright, easy-to-see sight picture. It's a genuine target-grade setup that performs well on its own even if you never mount an optic.
What kind of .22 LR ammo runs best in the Buck Mark Micro Bull?
The Buck Mark generally cycles a wide variety of standard and high-velocity .22 LR loads reliably. CCI Mini-Mag and Federal Auto Match are popular choices that run cleanly through the action. Like most rimfire pistols, it benefits from regular cleaning since .22 LR ammo tends to leave behind more fouling than centerfire cartridges, especially around the bolt face and chamber.
Is the Buck Mark Micro Bull SR good for new shooters?
It's a great fit for new shooters and experienced shooters alike. The .22 LR cartridge produces minimal recoil and is very affordable for extended range sessions, making it easy to build fundamentals without fatigue or flinching. The controls are straightforward, the slide is easy to rack thanks to the built-in side panel recesses, and the ambidextrous grips work for both right- and left-handed shooters.
Does the Buck Mark Micro Bull SR come with more than one magazine?
This model ships with one 10-round steel magazine. The Buck Mark magazine uses a coil spring design rather than the older Z-spring found on some rimfire pistols, which improves feed reliability over the long haul. Additional factory magazines are widely available and worth picking up if you plan on spending a full afternoon at the range.




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