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Marble Arms has been the name gunsmiths trust for iron sights since 1900, and this 34-MR fiber optic front sight carries that same reputation. It swaps out a dull brass or silver bead for a bright green fiber optic pipe that soaks up available light and glows, giving you a fast, glowing aiming point that older eyes and low-light hunts will appreciate. The bead sits at a .343" height with a .340" width, machined from solid steel so it holds up to real field use.
The ramp-style design drops into any front sight ramp cut for a standard 3/8" dovetail, which makes it a straightforward upgrade on plenty of lever guns, muzzleloaders, and traditional rifles. Marble keeps their signature contour on this sight, so it looks right at home on a classic rifle instead of tacked-on. The 3/32" bead strikes a nice balance, big enough to grab quick but fine enough for accurate holds at the range.
Height matters here. Marble measures from the top of the bead to the bottom of the dovetail, so before you order it helps to pull your old sight and measure with calipers to be sure .343" lines up with your rear sight. Installation is usually a matter of drifting the old sight out and tapping the new one in with a brass punch and light hammer taps. Some rifles need a touch of minor fitting, which is normal for dovetail sights.
One thing worth knowing: a solid sight hood can block the light the fiber optic needs to glow. If your gun runs a hood, you may want one with a cutout so the pipe still catches light. For anyone chasing quicker sight acquisition and a brighter front bead without giving up the traditional look, this green 34-MR is a proven pick from a name that has set the standard in gun sights for over a century.
It's a ramp-style sight built to drop into any front sight ramp with a standard 3/8" dovetail, which covers a lot of lever actions, muzzleloaders, and traditional rifles. Because fit comes down to your specific dovetail and the height you need, it's smart to measure your existing sight before ordering. Some guns may need minor fitting, which is normal for dovetail sights.
Marble measures this sight from the top of the bead to the bottom of the dovetail, so it comes out to .343". The best move is to remove your current front sight and measure it with calipers to compare, since front sight height works together with your rear sight to keep your point of impact where you want it. If you're between heights, matching your rear sight setup is the deciding factor.
Most installs come down to drifting the old sight out of the dovetail and tapping the new one in, so a brass punch and a light hammer usually get the job done. Go slow and work from the correct direction to avoid marring the finish. If the fit is snug, a little careful filing on the dovetail base is common.
A solid front sight hood can block the ambient light the fiber optic pipe needs to glow, which defeats the purpose of the sight. If you want to keep a hood on, look for one with a cutout that lets light reach the pipe. Otherwise, running it without a hood keeps that green bead nice and bright.
| UPC | 871373002508 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | 603426 |
| Color | GREEN |
| Style | Fiber Optic |
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