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If you've wrestled with cheap rings that twist your scope every time you snug a bolt, the American Rifle Company M-Brace 40mm Medium rings are a different animal. These are built for folks running big 40mm tube optics who want the scope to go on straight, stay put under recoil, and come back to zero if the glass ever comes off. The medium height puts your optical centerline at 1.10 inches above the top of the rail, which is a sweet spot for a lot of large-objective precision and long-range builds.
The standout here is the hinged, split-ring design. Instead of lifting the scope out of the way and fiddling with a stack of tiny cap screws, the top of the ring swings open like a clamshell, the scope drops in, and a single larger clamp screw per ring brings it down evenly. That one-bolt setup is a big reason people love these: the scope doesn't rotate on you as you torque down, so getting your reticle level is far less of a fight. The hinge pins float until you snug things up, so centering them before the final torque keeps everything square.
These rings are CNC machined from high-strength 7075 aluminum and anodized to a matte black finish that shrugs off corrosion. Even under heavy recoil they grip the tube firmly without leaving marks or indentations on your scope, which matters when you're running premium glass. The rail interface is cut to engage Picatinny (MIL-STD-1913) rails precisely, even rails that run a little loose on spec, and that tight fit is what gives you the excellent return-to-zero these are known for. Owners running everything from magnum hunting rigs to dedicated PRS builds tend to describe them the same way: overbuilt, light for their strength, and flat-out dependable.
One thing worth knowing is the torque spec runs higher than a lot of rings you may have used. ARC calls for 55 in-lbs on both the scope clamp and rail clamp screws because the single larger clamp screw needs more torque to match the clamping force of designs with multiple small screws. Grab a quality torque wrench and you're set.
These are made specifically for optics with a 40mm main tube, so they won't work with 30mm, 34mm, 35mm, or 36mm scopes. Always match your ring diameter to your scope's tube measurement before ordering. If you're unsure, check your scope's spec sheet for the tube size.
The medium height puts the optical centerline at 1.10 inches measured from the top of the rail to the center of the scope tube. That's a versatile height for a lot of large-objective builds, but make sure your objective bell and any bolt handle clear the barrel and action at this setting.
ARC uses a single larger-diameter scope clamp screw instead of several small ones, so it needs more torque to generate the same clamping force. The spec is 55 in-lbs on both the scope clamp and rail clamp screws. A quality torque wrench is strongly recommended, and ARC suggests a lower starting value for vintage or thin-walled tubes.
No. The M-Brace rings are designed to hold firmly even under heavy recoil without marring or indenting the scope tube, which is part of why they're popular with folks running premium glass. The hinged clamshell top also lets the scope drop in without the rotation and twisting you get from traditional cap-style rings.
| UPC | 810094450229 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | MB-R-40-28 |
| Style | PICATINNY |
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