And of course, as always, I ordered from my most trusted source for my firearm needs, www.brownells.com. With the gasket installed properly, Burris says that the Fastfire II is "100% sealed against water in normal use" and claims that it is submersible. I was surprised at how such a small movement of the screw changed the point of impact…thus the reason for the disc. I had no idea it was even there when I first ordered, and after it arrived, it turned out to be a nice little surprise. I have had my eye on the Burris series of optics for some time and was especially attracted to the Fastfire models. Low-intensity dot. The Burris AR-F3 has many different features, but the one I was most attracted to was the protection it offered the optic itself. This acts as a barrier between the fragile optic/lens and something hard like concrete or an unintentional move that could cause damage or failure. To remedy this, Burris says to use "any edge on the sight as a reference line." You then insert the two Torx mounting screws and tighten each to 12-inch pounds for a solid mount and to ensure the gasket is squeezed tightly between the optic body and mount. Click now to learn more. In other words, a bright day? I don't know about you, but 300 Blackout ammo isn't cheap or easy to come by in my area…whether you're talking reloaded or new commercial ammo. I would later find out the Fastfire has a 1.07x magnification, which finally explained the difference I was seeing. After viewing product detail pages, look here to find an easy way to navigate back to pages you are interested in.After viewing product detail pages, look here to find an easy way to navigate back to pages you are interested in. Not bad for an entire optic set-up, including the mount, especially seeing how the optics itself is made of stainless steel, bronze, and anodized aluminum. Meaning, we didn't mark it for you, so find an edge on the optic body and use it as your reference point yourself. After reviewing several EOTechs, Aimpoints, and Trijicon optics, I felt it was time to slow it down and review a more affordable optic that almost anyone could purchase and use. What do I mean by the environment? This thin gasket is the barrier between your optic's delicate internals and battery, which are located inside the body. As it earlier said the lower compartment offers convenient storage for a Torx and open-end wrench and as well as spare battery, but shooter need to remove the sight in order to access an extra battery. While I'm sure, Burris would replace it, who would want to wait? Don't make a knee-jerk reaction; just pick an optic that fits the bill. When sighting in the optic at closer or further distances, simply subtract or add to your adjustments. After you have made your adjustments, re-tighten the lock screws to keep them in place. Vortex Viper/Venom Oversized Novak Sight Mount (fits Burris FastFire and Docter) SKU:49311-OS From . $49.99. Price and other details may vary based on size and colorBurris Optics 410329 Fastfire Red Dot Reflex Sight Mount, Ruger Mark I, Ii Mount Fast Fire, BlackBurris Optics FastFire Mounts - Red Dot Sight Mount, Mounting Accessories, Available for mounting to Handguns, Rifles, and ShotgunsAmerican Defense AD-22 STD Riflescope Optic Mount, BlackTRUGLO TRU-TEC Micro Red Dot Sight Open Reflex Optic for Rifles, Shotguns and PistolsBurris Optics FastFire Mounts - Mount - Ruger American PistolDaniel Defense Aimpoint Micro Mount w/ Spacer - 03-045-18025Burris 3-9 x 40mm Fullfield II Ballistic Plex Rifle ScopeSig Sauer Romeo 7 Red Dot 3 MOA Rail Gun Scope, Graphite, Full Size (SOR71001)American Defense AD-T1-L STD Riflescope Optic Mount, BlackBurris Optics Signature Zee Rings, Works with Standard, Dovetail, Double-Dovetail, and Weaver-Style BasesVortex Optics Venom Red Dot Sight Quick-Release Mount RiserAmerican Defense AD-T1-11 STD Riflescope Optic Mount, BlackYou’re seeing this ad based on the product’s relevance to your search query.Burris Optics Signature High Definition, Fast Focus BinocularsBurris Optics XTR Signature Rings – Self-Centering, Aluminum Tactical with Dual Steel Clamps, Mounting Accessories, Burris RingsUTG Hi-Profile Compact Riser Mount, 1" High, 3 SlotsBurris Optics Veracity Rifle Scope 200650, 200651, 200652 – 5-25x50mm Riflescope - Top-of-the-Line Hunting Scope, Longer Distance ShotsBurris Optics 200637-PKG Package Scopes, Veracityx 40mm 3-15x50mm & Fullfield E1 4.5-14x42mm, Matte Black, BlackVortex Optics Razor Red Dot Sight Quick-Release Riser MountBurris 420044 Zee Rings (30-mm, Medium, Matte Black)Burris Optics Oracle Rangefinder Bow Sight, Built in Range Finder Measures Exact Distance, Calculates Perfect Aim/Drop Point, Adaptable Right or Left Handed Mount.Scubapro 3-Gauge in-Line Diving Console with FS-1.5 Compass, PGPSI DGFTBurris Optics SpeedBead Mounting System with Fastfire 3 for faster target acquisitionHawkins Contura-SSC30 Pressure cooker, Small, SilverCondor Usa Inc Pressure Switch 120/150psi Standard 3PSTTrijicon RM05G RMR 9 MOA Dual-Illuminated Green Dot SightBurris Optics XTR II Rifle Scope – 5-25x50mm Riflescope – Tactical Shooting, Long Distance ShootingBurris Rimfire and Airgun Rings, creating a lightweight mounting solutionHAWKINS H56 Hevibase Induction Compatible Aluminum Pressure Cooker, 5-Liter,SILVERTactical Area Multi-Functional Universal Reflective Exoskeleton Red Dot Sight Holder Reflex for Optics of Docter, MRDS, Burris, Delta, RMR Red Dot Sight MountBurris Optics SpeedBead Mount, Compatible with All FastFire red dot Models, RemingtonWeaver Thumbnut 1-Inch Scope Mounted Picatinny AdaptorNEW!