Osight SE DPP: Enclosed Red Dot for DeltaPoint Pro Cuts

The Osight SE DPP is an enclosed-emitter red dot built on the Leupold DeltaPoint Pro footprint, and that combination is the whole story, and the price is what makes it interesting. The DPP pattern uses two screws and a cross-slot recoil lug, and it reaches a wide set of hosts, natively on slides like the Springfield Echelon and SIG P320 and through the plate systems from Glock, CZ, HK, Canik, FN, and Walther. What it has never had is a deep bench of enclosed optics. Leupold's own DeltaPoint Pro is open-emitter, and the enclosed field on this cut is short enough to list in full: the Holosun SCS-320-GR at $399.99, the Vortex Defender-ST Enclosed Solar at $319.49, and now the SE DPP at $239.99. Osight is not inventing the category, it is undercutting it.

Enclosed emitters matter most on carry and duty guns. An open optic projects its dot across an exposed channel, so pocket lint, rain running off a slide, and unburned powder land directly on the diode and dim or kill the reticle. Sealing that channel moves the problem to an outer lens a shirt tail cleans. Our enclosed-emitter pistol red dot rankings cover the rest of that field, and the pistol red dot guide covers footprint selection if you are not locked to a DPP cut.

At 0.91 x 0.71 inches, the SE DPP window is about 10 percent wider and 29 percent taller than the 0.83 x 0.55 inch window on the RMSc-footprint Osight SE. Height is the dimension that actually pays. A short window loses the dot vertically as the slide cycles and the muzzle rises, which is the moment shooters describe as hunting for the dot. Adding glass above and below the reticle keeps it in the frame through the recoil arc and shortens the time to a confirmed second sight picture.

The width increase does less work but is not free of value: it widens the usable field for transitions between targets. Osight pairs the larger aperture with a multi-coated aspherical lens, and the reticle is a 2 MOA dot, a 32 MOA circle, or both together, selected from the side buttons. The 2 MOA dot is the precision setting, the 32 MOA circle is the speed setting, and the circle-dot combination is the compromise most competition shooters end up running. If you are picking an optic for a match gun rather than a carry gun, the USPSA red dot guide sorts the field by division.

The SE DPP direct-mounts to the Springfield Echelon, the SIG P320 Legion, RX, Pro and AXG variants, the Ruger RXM, the FN 309 MRD, and Shadow Systems MR920 and DR920 slides. Everything else reaches it through that host's own DeltaPoint Pro plate, including Glock Gen5 MOS and Gen6 guns via the Glock 04 plate. Osight ships four screw sets in the box to cover the different interfaces. Plates are not included.

Note what is thin on that list. Osight frames the DPP cut as common on 2011-pattern pistols, and the Springfield DS Prodigy is on the sheet through the AOS plate A15B, but the bulk of the fitment is polymer striker guns rather than double-stack 1911s. Treat the SE DPP as an Echelon, P320, and RXM optic first. You can check footprint fitment for a specific host in our component catalog before ordering plates.

Osight rates the SE DPP at up to 75,000 hours on the 2 MOA dot at brightness mode 3, running a CR1620 that loads through a side tray. The side tray is the part worth caring about: swapping a cell does not mean unbolting the optic, so a battery change does not cost you your zero or a trip back to the range to reconfirm it. Optics that bury the battery under the mounting surface make an annual battery swap a re-zeroing event.

Brightness runs 8 daylight levels plus 2 night-vision levels, adjusted from tactile buttons on the left side of the housing. Motion Activation Technology powers the optic down after 3 minutes without movement and brings it back the instant the gun is disturbed, which is how the rated runtime survives a holstered carry gun. The housing is CNC-machined 7075-T6 aluminum with an IPX7 rating, covering immersion but carrying no dust rating.

Every figure below comes from Osight's published product listings for the SE DPP.

Osight sent us an SE DPP and it is in testing now. Three things decide whether this optic is worth the footprint change, and none of them are on a spec sheet. The first is dot quality: a 2 MOA dot is only a 2 MOA dot if the emitter and lens hold it round, and budget enclosed optics are where flare and starbursting show up first, particularly for shooters with astigmatism. The second is zero retention across a live-fire string, since the DPP cross-slot lug and a correct torque value are doing all the work of holding position under slide cycling. The third is whether the larger window reads as genuinely faster next to an open-emitter DeltaPoint Pro on the same host.

Our review will report all three. In the meantime, our Osight XR review covers how the brand's enclosed RMR-footprint optic held up under the same questions, and the SE MOS launch coverage covers the direct-mount Glock variant of the same SE platform.

The SE DPP lists at $239.99, with a 15 percent launch promotion scheduled to run from August 10 at 8:00 pm through August 14 at 11:59 pm, 2026. Against the field, that puts an enclosed emitter on a DPP cut for well under what Leupold charges for the open-emitter DeltaPoint Pro the footprint is named after.

The RMSc-footprint Osight SE remains the cheaper option at $199.99 for shooters on slim slides who do not need the DPP pattern. Warranty is lifetime and transfers with the optic, with no receipt or registration requirement, which is a stronger position than most of the budget enclosed field takes.