Cache.Deals

The Cheapest Bullpup You Can Buy — But Is It Any Good?

Garand Thumb
Published on January 4, 2026
Category: Reviews
Duration: 39:07

This review of the Kel-Tech RDB bullpup rifle covers its performance in drills like the Bill Drill, highlighting its compact nature and adjustable gas system. While praised for its shootability and trigger, the review notes concerns regarding barrel thinness, accuracy limitations at range, and potential quality control issues. The RDB is presented as a budget-friendly bullpup option with notable strengths but also significant drawbacks that may prevent it from being a primary duty weapon.

Tags

Kel-Tech RDB
Bullpup Rifle
5.56x45mm
Bill Drill
Close Quarters Battle
Firearm Review
Trigger Control
Recoil Management
Suppressor Tuning
Accuracy Testing
Barrel Profile
Muzzle Device
Gas System Adjustment

Quick Summary

The Kel-Tech RDB is a budget-friendly 5.56x45mm bullpup rifle, praised for its compact design, adjustable gas system, and an exceptionally good trigger for its price point. However, its thin barrel leads to accuracy issues with heat, and concerns exist regarding its handguard, optic rail, and malfunction clearing capabilities, making it a fun range gun but not recommended for high-stakes duty.

Chapters

  1. 00:03Intro & Gnomes
  2. 01:28Idaho Cold & Kel-Tech RDB Intro
  3. 01:35Kel-Tech RDB: 5.56x45 Bullpup
  4. 01:47Cheapest Functional Bullpup
  5. 01:54Price Point: New vs. Used Market
  6. 02:16Channel Sponsor: Primary Arms
  7. 02:54Dryfire Mantis Mention
  8. 03:01Ammunition Sponsor: AAC
  9. 03:08Kel-Tech RDB: Interesting Weapon
  10. 03:21Adjustable Gas System & Suppressor Tuning
  11. 03:44Performance: Shooter's Perspective
  12. 04:00Bill Drill: 6 Rounds, 7 Yards
  13. 04:32Bill Drill Results & Grouping
  14. 05:03Rifle Performance: Quick & Good
  15. 05:06Bullpup Action Weight & Maneuverability
  16. 05:24One-Handed Shooting Comparison
  17. 05:46Target Transition Drill
  18. 06:02Target Transition Results
  19. 06:23Cadence of Shooting: Frank Proctor
  20. 06:46Gun Working Great
  21. 06:52Compactness of the Gun
  22. 07:21AR-15 URGI vs. RDB Comparison
  23. 07:37URGI vs. RDB Length Comparison
  24. 07:40URGI 11.5" Barrel vs. RDB 16.1" Barrel
  25. 07:47Barrel Length Significance: Velocity & Lethality
  26. 08:10Compactness & Maneuverability Benefits
  27. 08:30Personal Carry vs. Bullpup Benefits
  28. 08:51No Free Lunch: Recoil & Ergonomics
  29. 09:03Close Shooting vs. Far Shooting
  30. 09:09Recoil Comparison: RDB vs. URGI
  31. 09:31URGI Easier to Control
  32. 09:40Long Range Shooting: RDB at 350 Yards
  33. 09:59Thin Barrel Issues: Heating & Vertical Stringing
  34. 10:23Suggestion to Kel-Tech: Thicker Barrel
  35. 10:32350 Yard Shot Results
  36. 10:51Pushing to 500 Yards
  37. 11:00500 Yard Shot Attempt
  38. 11:19500 Yard Impact Analysis
  39. 11:24Cool Gun & Barrel Heating
  40. 11:36Moving to 600 Yards
  41. 11:59600 Yard Shot Attempt
  42. 12:13600 Yard Impact Analysis
  43. 13:03Wandering Zero Issue
  44. 13:24Limitations: Barrel Profile & Inaccuracy
  45. 13:46Enough Shooting, Time to Talk
  46. 13:50Breakdown: Autism Style
  47. 14:02Kel-Tech RDB Breakdown
  48. 14:05Kel-Tech Stereotypes: Cocaine & Florida Man
  49. 14:15RDB: Fairly Good Gun Design
  50. 14:23Manufacturing & Quality Control Issues
  51. 14:41Full Disclosure: Received Firearms from Kel-Tech
  52. 14:58RDB on Paper: Looks Good
  53. 15:02Bullpup Design: Magazine Behind Trigger
  54. 15:22Short Stroke Gas Operation System
  55. 15:33Odd Short Stroke Gas System
  56. 15:42Action Exposed to Elements
  57. 16:07OP Rod Appearance: Long Stroke Gas Pistonish
  58. 16:15Medium Stroke Gas System
  59. 16:30Gassing & Suppressor Compatibility
  60. 16:35Least Expensive Bullpup Rifle
  61. 16:45Price Point: $900-$1000, Used Market
  62. 16:54Comparison to BCM/Geissele AR-15s
  63. 17:17Muzzle Device: A2 Flash Hider
  64. 17:37Barrel Profile: Very Thin
  65. 17:43Suppressor Mounting to A2
  66. 17:51BNT Suppressor Used
  67. 18:01Adjustable Gas System: Unprecedented for Price
  68. 18:24Downward Ejecting Rifle
  69. 18:45Shooting Suppressed: A Pleasure
  70. 19:05Issues: Barrel Profile
  71. 19:17Thin Barrel Profile: Lightweight & Handy
  72. 19:28Barrel Profile Problems: POI Shift & Vertical Stringing
  73. 19:34POI Shift with Suppressor: 3-5 MOA
  74. 20:04Vertical Stringing as Barrel Heats Up
  75. 20:20Overall Accuracy: Not Particularly Accurate
  76. 20:25Claims of Sub MOA Debunked
  77. 20:50Typical Accuracy: 3-4 MOA
  78. 21:16M4 Military Standard: 3-4 MOA for Shot Out Gun
  79. 21:25Accuracy Suboptimal
  80. 21:30Gas System: Awesome
  81. 21:39Optic Rail Concerns
  82. 21:48Optic Rail Security: Hex Screws
  83. 22:03Short Rail Space
  84. 22:12Issues with Magnified Optics & NV/Thermal
  85. 22:41Handguard: RDB Defender
  86. 22:57Handguard Movement & Wobble
  87. 23:37Unusable M-LOK Slots
  88. 24:36Aftermarket: Hogad Defense
  89. 25:00Charging Handle
  90. 25:17Rough Machining Inside
  91. 25:30Reloading Options: HK Style
  92. 25:51Bolt Hold Open Feature
  93. 25:57Magazine Release Lever
  94. 26:13Bolt Release: Super Stiff
  95. 26:26Bolt Release with Loaded Magazines
  96. 26:27Hoget Bolt Release Solution
  97. 26:35Charging the Weapon After Reload
  98. 26:44Manual of Arms: Different
  99. 26:52Assault Rifle from Halo
  100. 27:02Sling Mount Points
  101. 27:14Paradoxical Rifle Design
  102. 27:22Best Feature: The Trigger
  103. 27:26Bullpup Triggers Suck (Generally)
  104. 27:28Tabora Geyser Trigger vs. AUG
  105. 27:35Helion Trigger
  106. 27:40Factory Trigger for Sub-$1000 Rifle
  107. 27:44Trigger Pull: 2mm Play, Light Second Wall
  108. 27:51Loud Hammer Spring
  109. 28:00No Light Primer Strikes
  110. 28:07Firing Pin Wear: 4,000 Rounds
  111. 28:16Cleaning & Lube
  112. 28:24Trigger Reset: Not Tactile, But Light
  113. 28:31Trigger Pull: 3.5 lbs Off Reset
  114. 28:48Safety Lever
  115. 28:54Safety Throw: ~40 Degrees
  116. 29:08Grip Angle
  117. 29:11Grip: Module Unit, Not AR-15 Swap
  118. 29:23Magazine Compatibility
  119. 29:25Mag Wells from Hoga Defense
  120. 29:31USGI Stag Mags May Not Fit
  121. 29:49Gen 2/3 PMAGs Work
  122. 30:13Hunky Dory Term Discussion
  123. 30:16Sling Mounting Locations
  124. 30:23Left Side Sling Mount
  125. 30:34Right Side Sling Mount
  126. 30:47Spinning Sling Mounts
  127. 30:52Desire for Locking Sockets
  128. 31:05Difficulty with Back Sling Location
  129. 31:13Many Sling Mounting Locations
  130. 31:20Not Quick Release Mechanism
  131. 31:26Mortaring the Rifle
  132. 31:41Length of Pull Adjustment
  133. 31:46Buttstock: Plastic, Slippy
  134. 31:54Hoga Defense Buttstock Options
  135. 32:10Adjusting Allen Keys
  136. 32:16Buttstock Pushing Back In
  137. 32:46Buttstock Breakage
  138. 32:51Upgrade Buttstock Recommended
  139. 32:56Malfunctions: Diagnosing & Fixing
  140. 33:06Magazine & Ejecting Brass Location
  141. 33:10Difficult to See Malfunction Type
  142. 33:28Screwdriver for Clearing Malfunctions
  143. 33:41Bad Malfunction: Break Gun Down
  144. 33:51Three Push Pins for Breakdown
  145. 33:58Push Pins: Non-Retained
  146. 34:03Military Firearm: Retained Pins
  147. 34:13Not a Military Firearm to Bet Life On
  148. 34:28Inability to Diagnose Malfunctions Easily
  149. 34:32QC Issues
  150. 34:35Firing Pin Breakages
  151. 34:44Quirks: Some Run, Some Don't
  152. 34:56Back to the Mother Ship (Florida)
  153. 35:03RDB: Weird Location, Almost Really Good
  154. 35:10Improvements Needed: Handguard, Chamber Check, Materials, Workmanship, QC
  155. 35:26Cheapest Bullpup on the Market
  156. 35:33Adjustable Gas System, Soft Shooting
  157. 35:38Accuracy Limitations
  158. 35:45Not a Gun to Shoot Much
  159. 35:48RDB: A Lot of Disappointment
  160. 35:53Not a Gun to Bet Life On
  161. 36:01Betting Life On It: Break-in Period
  162. 36:09Keep Firing Pins & Screwdriver
  163. 36:18RDB: Close, But No Cigar
  164. 36:22Setup: Magnified Optic & Eye Relief
  165. 36:29ACOG 4x with Top-Mounted RMR
  166. 36:38Bullpups & ACOGs/LCAs
  167. 36:46Purse Laser
  168. 36:48Surefire Light
  169. 37:02Velcro & Hot Glue for Pressure Pad
  170. 37:11Setup Complete
  171. 37:11Want to Like This Thing
  172. 37:16Pretend to be in Halo
  173. 37:19RDB: Fun Gun, Not for Betting Life On
  174. 37:30Is it Worth It?
  175. 37:35Decide for Yourself, Do More Research
  176. 37:46Thank You for Watching
  177. 37:48Dad Advice: Eat Steak
  178. 38:04Wagyu vs. Actual Meat
  179. 38:27Patreon & Coolest Clips
  180. 38:32Game Nights with Sawyer
  181. 38:43Game Nights: Super Sick
  182. 38:56Games Played: Battlefield
  183. 39:03Check it Out

Frequently Asked Questions

What is the Kel-Tech RDB and what makes it unique?

The Kel-Tech RDB is a 5.56x45mm short-stroke gas-operated bullpup rifle. It is notable for being one of the least expensive functional bullpup firearms available, typically costing between $900 and $1,000 new, and features an easily adjustable gas system ideal for suppressor use.

How does the Kel-Tech RDB perform in terms of accuracy?

The reviewer found the Kel-Tech RDB's typical accuracy to be between 3 to 4 MOA, which is considered suboptimal. Claims of sub-MOA accuracy are disputed, and the thin barrel profile contributes to vertical stringing and accuracy degradation as the barrel heats up.

What are the main drawbacks of the Kel-Tech RDB?

Key drawbacks include a thin barrel prone to heating and accuracy issues, a short and potentially insecure optic rail, a wobbly handguard with unusable M-LOK slots, and difficulties in diagnosing and clearing malfunctions. The non-retained pins and breakable buttstock are also noted concerns.

What is the trigger like on the Kel-Tech RDB?

The trigger on the Kel-Tech RDB is highlighted as a significant positive feature. It offers a light pull (around 3.5 lbs off-reset) with minimal pre-travel and a crisp break, which is exceptional for a sub-$1000 bullpup rifle.

Is the Kel-Tech RDB recommended for self-defense or duty use?

The reviewer does not recommend the Kel-Tech RDB for situations where one would bet their life on it. While it has some positive attributes like its compact size and good trigger, the noted accuracy limitations, potential reliability quirks, and difficulty with malfunctions make it less suitable for critical applications.

Related Articles

All Articles →
The Rifle America Keeps Banning: 50 Years of AK-47 Import Restrictions
Explainer20 min read

The Rifle America Keeps Banning: 50 Years of AK-47 Import Restrictions

Canik MC9 Prime: Complete Guide
Gear Deep Dive18 min read

Canik MC9 Prime: Complete Guide

More Reviews Videos You Might Like

I Finally Tried a Tavor X95 (and now I get the hype)
I Finally Tried a Tavor X95 (and now I get the hype)

This review of the IWI Tavor X95 bullpup rifle by Elliott Delp highlights its compact nature, unique features, and performance. The video details its handling, accuracy with various ammunition types, and compares it to traditional AR-15 platforms. It's presented as a distinct and capable firearm, particularly for those seeking something different from the standard rifle.

IWI Tavor X95
Bullpup Rifle
Channel:Elliott Delp
Category:Reviews
Date: Mar 15, 2026
Duration: 13:01
.308 Rifle vs. The End Of The World | IWI Tavor 7
.308 Rifle vs. The End Of The World | IWI Tavor 7

This video reviews the IWI Tavor 7 rifle chambered in 7.62 NATO (.308 Winchester). The presenter discusses its suitability for survival scenarios, highlighting its compact bullpup design and the effectiveness of the .308 round for hunting and defense. The review also covers operational aspects, including ambidextrous controls and a troubleshooting segment on magazine compatibility issues.

IWI Tavor 7
.308 Winchester
Channel:Yoki Sturrup
Category:Reviews
Date: Aug 24, 2025
Duration: 15:01
Dying Harder: Steyr AUG Surges Out from the Pack
Dying Harder: Steyr AUG Surges Out from the Pack

This review of the Styer AUG A3 M2 NATO focuses on its resurgence in popularity, often referred to as 'Die Hard cool.' The video highlights its combat-proven design, modularity with quick-change barrels, and impressive Austrian quality. While acknowledging its excellent form factor and handling, the review points out a heavy trigger pull as a significant downside. It concludes that the AUG remains a capable and desirable firearm, especially for those appreciating its iconic status and robust construction.

Styer AUG A3 M2
Bullpup Rifle
Channel:nutnfancy
Category:Reviews
Date: Feb 28, 2026
Duration: 29:20
Desert Tech MDRX Bullpup: Ain't Quite There Yet
Desert Tech MDRX Bullpup: Ain't Quite There Yet

This review of the Desert Tech MDRX highlights its significant weight issues, particularly in the 5.56 NATO configuration, making it a less than ideal choice for many applications. While the rifle demonstrates good accuracy potential and a quality trigger, it suffers from reliability quirks, including jams and bullets entering the stock, observed during bench testing. The reviewer suggests that the multi-caliber system makes more sense in larger calibers like .308 Winchester, with a conversion kit for 5.56, and anticipates the successor, the Wolverine, will address many of these shortcomings.

Desert Tech MDRX
Bullpup Rifle
Channel:nutnfancy
Category:Reviews
Date: Apr 18, 2025
Duration: 43:23
HK MR556 A4 10,000 round burn - The baseline [Ep.1] 🔥
HK MR556 A4 10,000 round burn - The baseline [Ep.1] 🔥

This video details the baseline phase of a 10,000-round endurance test for the Heckler & Koch MR556 A4 rifle. Experts analyze the rifle's performance, focusing on accuracy with various ammunition types and conducting a bore scope examination after 3,102 rounds. The test aims to empirically evaluate the non-chrome-lined, proprietary alloy barrel's durability and performance compared to standard options.

HK MR556 A4
Heckler & Koch
Channel:9-Hole Reviews
Category:Reviews
Date: Feb 6, 2026
Duration: 36:01
4/17/26 •Can I pet that….• EXILE ARMORY •256-452-5979• Weaver, AL
4/17/26 •Can I pet that….• EXILE ARMORY •256-452-5979• Weaver, AL

This video from Exile Armory LLC showcases a variety of firearms and accessories currently available, with a focus on a flash sale happening on specific dates. The presenters highlight pricing and some features of handguns and rifles, including models from HK, Taurus, Kel-Tec, Bond Arms, Ruger, Diamondback, FN, Pioneer Arms, Smith & Wesson, CZ, Arsenal, American Tactical, and Sig Sauer. They also discuss current inventory challenges with certain brands like Glock and encourage viewers to contact them for competitive pricing and availability.

HK
HK CC9
Channel:Exile Armory LLC
Category:Reviews
Date: Apr 17, 2026
Duration: 8:27

More from Garand Thumb

View all →
Garand thumb
Garand thumb

This guide details the proper technique for safely loading the M1 Garand, specifically addressing the common 'Garand Thumb' phenomenon. It emphasizes maintaining downward pressure on the en-bloc clip during loading to prevent the bolt from slamming forward prematurely. Expert instruction from Garand Thumb highlights this as a key safety measure for new shooters.

M1 Garand
Garand Thumb
Channel:Garand Thumb
Category:Training & Techniques
Date: Dec 30, 2012
Duration: 0:30
How strong is this Russian Titanium helmet? The Altyn Helmet
How strong is this Russian Titanium helmet? The Altyn Helmet

This comprehensive review of the Russian Altyn helmet, presented by Garand Thumb, details its construction and ballistic performance. The helmet features a 3mm titanium shell with an aramid liner, rated for pistol and fragmentation threats. Testing reveals it stops 9mm and .44 Magnum rounds but fails against rifle calibers like 5.56x45mm and 7.62x39mm. Despite its robust construction for its intended role, its significant weight and lack of rifle protection are noted as drawbacks compared to modern alternatives.

Altyn Helmet
Ballistic Testing
Channel:Garand Thumb
Category:Tactical & Gear
Date: Feb 27, 2022
Duration: 26:26
Do bulletproof masks actually work? Ballistic test.
Do bulletproof masks actually work? Ballistic test.

Garand Thumb, a recognized subject matter expert in tactical equipment, critically assesses the effectiveness of ballistic face masks. The video details rigorous testing using realistic ballistic dummies and various firearms, from handguns to rifles, to measure projectile stopping power and backface deformation. The conclusion highlights significant risks associated with these masks, primarily due to severe deformation, suggesting they are often 'gimmicky' and less effective than traditional head protection.

Ballistic Face Mask
NIJ Level 3A
Channel:Garand Thumb
Category:Tactical & Gear
Date: Jan 16, 2022
Duration: 17:22
I give myself Garand Thumb / we find out how painful garand thumb is
I give myself Garand Thumb / we find out how painful garand thumb is

This guide details the correct technique for loading the M1 Garand rifle, specifically addressing how to avoid 'Garand Thumb.' It emphasizes the 'bladed hand' method, a crucial technique for safe and efficient loading demonstrated by the speaker. Proper execution involves a swift, decisive motion to seat the en-bloc clip while protecting the thumb from the forward-moving bolt.

M1 Garand
En-bloc Clip
Channel:Garand Thumb
Category:Training & Techniques
Date: Aug 22, 2021
Duration: 17:41
Find an FFL
Licensed dealers in your area