Rifle borescopes help shooters and gunsmiths inspect barrel interiors for cleanliness, wear, and fouling without disassembling the firearm. Modern models connect to phones, tablets, or PCs, offering high‑definition images, adjustable mirrors, and long insertion probes. This guide highlights five top options designed for .20 caliber and larger barrels, covering compatibility, image quality, and ease of use. Whether you’re maintaining accuracy, diagnosing barrel damage, or planning routine cleanings, a reliable borescope is a valuable addition to your security and maintenance toolkit.
Product Snapshot
| Product | Key Feature | Platform/Compatibility |
|---|---|---|
| Teslong Rifle Borescope with 4.5″ Screen | 5″ IPS screen, 0.2″ probe, 26″ rigid rod, 1080p recording | Windows, Android (not iOS) |
| Teslong Rigid Rifle Borescope with 5″ Monitor | 5″ LCD, 32GB microSD, 0.2″ probe, 26″ rigid | Windows, Android (not iOS) |
| Teslong Rifle Borescope for Phone & PC (USB-C) | USB‑C connection, supports iPhone 15/16, 0.2″ probe | iPhone 15/16, USB‑C Android, Windows/Mac |
| Teslong Rifle Borescope for Phone & PC (USB-C) – With Mirrors | Same USB‑C design with 6 mirrors, multi‑caliber support | iPhone/Android USB‑C, Windows/Mac |
| 3.9mm Small Hole Borescope (StrongTools) | 3.9mm probe, IP67 waterproof, 6 LEDs | iOS/Android via OTG |
Teslong Rifle Borescope for USB‑C Phones
The USB‑C version expands direct compatibility with modern iPhones and Android devices. It uses a 0.2-inch (5mm) probe paired with a high‑definition close‑focus camera to inspect barrels from .20 caliber and up. The kit includes multiple mirrors to adapt to various calibers, reducing glare and improving visibility in tight bores. Users can maintain cleanliness, identify throat erosion, and spot rifling wear before accuracy declines.
Teslong Rifle Borescope (Selective Android/PC Use)
This model focuses on rifle inspection for Windows PC or Android devices via OTG. It features a 0.2-inch probe suitable for .20 caliber and larger barrels, enabling quick evaluation of cleanliness, throat erosion, and chamber damage. It is not compatible with iPhone/iPad, so Android users can leverage direct connections without adapters. The compact interface supports efficient diagnostics to guide maintenance decisions.
Teslong Rigid Rifle Borescope with Long Insertion Tube
This rigid borescope offers a long 26-inch insertion tube and a 4.5-inch display for on‑device viewing. The 0.2-inch probe enters barrels as small as .20 caliber, delivering high‑definition visuals without external devices. Built-in memory supports saving images and videos, which helps with documentation during maintenance and after cleaning sessions.
Teslong Rifle Borescope with 4.5″ Screen and Multi‑Mirror Kit
This kit combines a 4.5-inch screen with 45-inch flexible probe and a right angle mirror. It targets rifle inspection with a focus on ease‑of‑use and immediate feedback. A USB/SD workflow supports quick recording of observations and sharing with a gunsmith or range partner for collaborative maintenance planning. It remains suitable for calibers .20 and larger and emphasizes practical, plug‑and‑play operation.
Teslong Rigid Rifle Borescope With 5″ Monitor
This model emphasizes a robust 5-inch IPS screen with 32GB microSD for media storage. Its 26‑inch insertion tube complements the 0.2‑inch probe to facilitate full‑length bore inspection while avoiding frequent device swapping. It’s designed for straightforward operation, saving time during routine maintenance and enabling clear evidence of wear patterns in the rifling and throat area.
Buying Guide
Key purchase considerations ensure you choose a borescope that matches your rifles, usage, and workspace.
- Caliber compatibility: Most models support barrels as small as .20 caliber and up to larger calibers; verify the maximum bore size with your firearm family.
- Insertion length and rigidity: Longer, rigid probes reach deeper into long barrels, while flexible probes adapt to curved sections. A mix of both offers versatility for different rifles.
- Image quality and display: Higher resolution screens (1080p) and good illumination improve visibility of tool marks, corrosion, and fouling. Built‑in storage helps record findings for later evaluation.
- Connectivity: USB‑C and OTG compatibility enable direct use with modern smartphones; Windows/Mac support is common for PC users. Consider whether you need external apps or plug‑and‑play operation.
- Mirrors and optics: Mirrors in multiple angles reduce glare and enhance visibility in hard‑to‑see sections of the bore. A dedicated angle mirror kit is helpful for multi‑caliber inspection.
- Durability and water resistance: IP ratings and protective housings matter when working in damp environments or bench setups.
When selecting a borescope, balance device compatibility with your routine. For field use, USB‑C models that connect directly to a phone provide portability. For workshop setups, a standalone monitor and longer insertion tubes can improve efficiency and reduce the need for constant device switching. Always consult manufacturer notes for best practices on cleaning, calibration, and maintenance to preserve bore integrity and accuracy over time.