--- product_id: 183557309 title: "Discovery optical Rifle Scope Bubble Level for 1in / 30mm Tube Riflescope Anti-cant used for Shooting and Hunting" brand: "brand: discovery optical" price: "$18.09" currency: USD in_stock: false reviews_count: 8 url: https://www.desertcart.us/products/183557309-discovery-optical-rifle-scope-bubble-level-for-1in-30mm-tube store_origin: US region: United States of America --- # Discovery optical Rifle Scope Bubble Level for 1in / 30mm Tube Riflescope Anti-cant used for Shooting and Hunting **Brand:** brand: discovery optical **Price:** $18.09 **Availability:** ❌ Out of Stock ## Quick Answers - **What is this?** Discovery optical Rifle Scope Bubble Level for 1in / 30mm Tube Riflescope Anti-cant used for Shooting and Hunting by brand: discovery optical - **How much does it cost?** $18.09 with free shipping - **Is it available?** Currently out of stock - **Where can I buy it?** [www.desertcart.us](https://www.desertcart.us/products/183557309-discovery-optical-rifle-scope-bubble-level-for-1in-30mm-tube) ## Best For - brand: discovery optical enthusiasts ## Why This Product - Trusted brand: discovery optical brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Description All type available: Upgrade Type1: for 25.4mm tube scope Upgrade Type2: for 30mm tube scope Upgrade Type3: for 34mm tube scope Product specifications: Place of Origin: China (Mainland) Brand Name: ApexHorizon Optics Type: Scope Mounts & Accessories Ring Diameter: 25.4/30mm/34mm(1/1.1/1.3in) Material: Full Aluminum Alloy Thickness: 10mm Used On: Rifle Scope Fit scope: 1inch, 30mm and 34mmTube Scope Lock: head screw Color: Matte Black Finish Package: OPP Bag Weight: 24g(1in),18g(30mm),20g(34mm) OEM: Yes Product features : Technology improved to be more durable and scratch-proof and looks more better Light and visible as possible to more easy to measuring the horizontal Use this bubble level to make sure your gun level shooting the target Mounts quickly and easily to the riflescope tube About ApexHorizon Optics : ApexHorizon Optics is an outstanding outdoor brand from China. Its dreams to build a scope with better clarity and shock proof for large-caliber, which allowed the shooters acquire their target quickly, and to hit targets in all weather and lighting conditions. The meaning of ApexHorizon Optics is that to see the unknown world, to know what you don't know, to face what you know. Covered By Lifetime Warranty - ApexHorizon Optics Bulletproof 100% Money Back Guarantee. We promise you always get what more than you paid here. ## Features - P.when("ReplacementPartsBulletLoader").execute(function(module){ module.initializeDPX(); }) - Replace the 6mm diameter bubble level with 8mm bubble level to make it more visible on your rifle scope - The thickness of bottom is only 2mm(for 30mm and 34mm) or 4.4mm(for 25.4mm) - It is easy to install and to mount anywhere on scope tube left or right side, the ring is so light to carry and cannot block you view of hunting - Makes it easy to maintain a perfect horizontal hold during extreme-range shooting - Viscous fluid: No matter what circumstance, it always exists one bubble ## Images ![Discovery optical Rifle Scope Bubble Level for 1in / 30mm Tube Riflescope Anti-cant used for Shooting and Hunting - Image 1](https://images-na.ssl-images-amazon.com/images/I/61eOvdWconL.jpg) ![Discovery optical Rifle Scope Bubble Level for 1in / 30mm Tube Riflescope Anti-cant used for Shooting and Hunting - Image 2](https://images-na.ssl-images-amazon.com/images/I/51ghQykPjKL.jpg) ![Discovery optical Rifle Scope Bubble Level for 1in / 30mm Tube Riflescope Anti-cant used for Shooting and Hunting - Image 3](https://images-na.ssl-images-amazon.com/images/I/61CggPPOA8L.jpg) ![Discovery optical Rifle Scope Bubble Level for 1in / 30mm Tube Riflescope Anti-cant used for Shooting and Hunting - Image 4](https://images-na.ssl-images-amazon.com/images/I/61IkvhKPu5L.jpg) ![Discovery optical Rifle Scope Bubble Level for 1in / 30mm Tube Riflescope Anti-cant used for Shooting and Hunting - Image 5](https://images-na.ssl-images-amazon.com/images/I/71nrzApQBFL.jpg) ## Available Options This product comes in different **Size** options. ## Customer Reviews ### ⭐⭐⭐⭐⭐ Without contacting the manufacturer and only posting a not so great review, they contacted me immediately and replaced it *by A***R on Reviewed in the United States on June 15, 2016* I purchased the anti cant device and it worked when I took it took it to the range. The next day the bubble had expanded to almost the full size of the glass window maybe 3-4 times the size of the proper bubble and well outside both lines. Without contacting the manufacturer and only posting a not so great review, they contacted me immediately and replaced it. I received the new device within 3 days! Excellent customer service for sure! ### ⭐⭐⭐⭐ Discovery brand vs Vortex brand *by K***R on Reviewed in the United States on December 6, 2017* Photos tell the story. Discovery level vs Vortex level. Pros and cons for both. Discovery - 1. Small and dainty 2. Needs to be mounted on shooter side of turret. 3. Larger distance between bubble and side lines. 4. Bubble moves slower due to thicker fluid. 5. Bubble level glued in position. 6. About $9 Vortex - 1. Bigger and beefier 2. Best mounted on muzzle side of turret. 3. Smaller distance between bubble and side lines. 4. Bubble moves quickly due to thinner fluid. 5. Bubble level held in place by snap ring. 6. About $35. Summary: The Discovery fits and looks better on the Leupold 1" tube scope. The small size does not interfere with the turret visibility or use. The Vortex is a bit bulky and awkward looking on the 1' tube scope, but is a higher quality item. The large size mandates mounting it on the muzzle side of the turret. The Vortex, in a 30 mm size, looks and works great on a large, long-range scope, with big turrets. Final wish - That Vortex would make a quality level the size of the Discovery brand, for a 1' tube scope. ### ⭐ I would rather repeatedly stub my toe on a curb than buy this again *by J***N on Reviewed in the United States on March 19, 2018* The plastic spirit level immediately fell from its mounting location. There is no sign of any adhesive or deliberate permanent or semi-permanent attachment besides "I made a hole in the thing, then I put the spirit level in the hole". The lateral edges of the "ring" (a term apparently used very loosely by the manufacturer) contact every 30mm tube I own, but only the edges make any contact. The rest pivot fore and aft from the contact points at the sides. The circumference and diameter of this monstrosity do not share the same horizon with a 30mm circle. I wouldn't accept a replacement if it came with a lapdance from a half-dozen Charlize Theron clones and a free cup of coffee. I should have known better for $12. if you want to know what it's like to buy this, set some money on fire, wait a few days, and then punch yourself in the face. It adds up the same. --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.us/products/183557309-discovery-optical-rifle-scope-bubble-level-for-1in-30mm-tube](https://www.desertcart.us/products/183557309-discovery-optical-rifle-scope-bubble-level-for-1in-30mm-tube) --- *Product available on Desertcart United States of America* *Store origin: US* *Last updated: 2026-05-19*