The CMMG Endeavor Mk4 5.56 NATO 18" Tactical Semi-Auto Rifle - Black is a 5.56 NATO semi-automatic rifles from CMMG. It is available from 2 vendors at $1213.09 to $1213.99.
Name: CMMG Endeavor Mk4 5.56 NATO 18" Tactical Semi-Auto Rifle - Black
Brand: CMMG
Category: Semi-Automatic Rifles
Caliber: 5.56 NATO
Barrel Length: 18"
Capacity: 30 rounds
UPC: 810046238684
SKU: UCEGCVSsG
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The Endeavor Mk4 is a semi-automatic AR-15 pattern rifle chambered in 5.56 NATO with an 18-inch barrel. At 37.8 inches overall with a 30-round capacity, it covers standard AR applications with a longer barrel than the typical 16-inch carbine configur...
The Endeavor Mk4 is a semi-automatic AR-15 pattern rifle chambered in 5.56 NATO with an 18-inch barrel. At 37.8 inches overall with a 30-round capacity, it covers standard AR applications with a longer barrel than the typical 16-inch carbine configuration, which adds some velocity and extends the effective range of 5.56 NATO.
The rifle ships with a ZEROED pistol grip and trigger guard, an ambidextrous safety with 60/90-degree engagement options, and a ZEROED AR-15 ambidextrous charging handle and mag catch. The extended mag release button and bolt catch speed up reloads. A 5.56mm muzzle brake is fitted from the factory, which reduces muzzle rise for faster target re-acquisition. An AR-15 polymer dust cover keeps debris out of the action when the rifle is carried in the field.
The ambidextrous controls make the rifle genuinely usable for left-handed shooters, not just those operating right-handed with their off hand.
The 18-inch barrel gives this rifle a niche between a standard carbine and a full 20-inch rifle-length build. It works at the range for accuracy-focused practice, fits home defense use cases where the longer barrel is not a liability, and functions well for hunting applications within 5.56 NATO's practical limits on game. Competitive shooters who run AR-pattern rifles will find the ambidextrous controls and adjustable safety angles useful for stage-specific setups.
The CMMG Endeavor Mk4 in 5.56 NATO gets a generally positive reception, with a few recurring criticisms that are worth knowing before buying.
Build quality is the most consistently praised aspect. Owners report the rifle feels solid and handles the range of loads they run through it without issues. Accuracy comments are favorable, and the 18-inch barrel length is seen as a meaningful upgrade over 16-inch carbines for those who spend time at distances past 200 yards. Ergonomics, particularly the grip geometry and ambidextrous controls, get positive mentions from both right- and left-handed shooters.
Customization is a draw for the AR community. The platform takes standard AR-15 components, so owners swap triggers, handguards, and optics without sourcing proprietary parts. The ZEROED accessories that ship with the rifle are functional, but some buyers replace them with preferred aftermarket parts anyway.
Price is the main point of debate. The Endeavor Mk4 costs more than comparable 5.56 AR builds from some other manufacturers, and a few reviewers feel the CMMG premium isn't fully justified against alternatives at lower price points. Weight is mentioned occasionally. The 18-inch barrel adds some length and mass compared to a carbine, which matters in scenarios requiring active movement. Parts and accessories availability is noted as a concern relative to more common AR brands with deeper aftermarket ecosystems.
AI-generated insights derived from customer reviews and discussions on popular gun-enthusiast forums.
The Endeavor Mk4 is a semi-automatic AR-15 pattern rifle chambered in 5.56 NATO with an 18-inch barrel. At 37.8 inches overall with a 30-round capacity, it covers standard AR applications with a longer barrel than the typical 16-inch carbine configuration, which adds some velocity and extends the effective range of 5.56 NATO.
The rifle ships with a ZEROED pistol grip and trigger guard, an ambidextrous safety with 60/90-degree engagement options, and a ZEROED AR-15 ambidextrous charging handle and mag catch. The extended mag release button and bolt catch speed up reloads. A 5.56mm muzzle brake is fitted from the factory, which reduces muzzle rise for faster target re-acquisition. An AR-15 polymer dust cover keeps debris out of the action when the rifle is carried in the field.
The ambidextrous controls make the rifle genuinely usable for left-handed shooters, not just those operating right-handed with their off hand.
The 18-inch barrel gives this rifle a niche between a standard carbine and a full 20-inch rifle-length build. It works at the range for accuracy-focused practice, fits home defense use cases where the longer barrel is not a liability, and functions well for hunting applications within 5.56 NATO's practical limits on game. Competitive shooters who run AR-pattern rifles will find the ambidextrous controls and adjustable safety angles useful for stage-specific setups.
| Caliber | 5.56 NATO |
| Model | Endeavor Mk4 |
| Capacity | 30 rounds |
| Barrel length | 18" |
| Overall length | 37.8" |
| Action | Semi Auto |
| Color | Black |
AI-generated insights derived from customer reviews and discussions on popular gun-enthusiast forums.
The CMMG Endeavor Mk4 in 5.56 NATO gets a generally positive reception, with a few recurring criticisms that are worth knowing before buying.
Build quality is the most consistently praised aspect. Owners report the rifle feels solid and handles the range of loads they run through it without issues. Accuracy comments are favorable, and the 18-inch barrel length is seen as a meaningful upgrade over 16-inch carbines for those who spend time at distances past 200 yards. Ergonomics, particularly the grip geometry and ambidextrous controls, get positive mentions from both right- and left-handed shooters.
Customization is a draw for the AR community. The platform takes standard AR-15 components, so owners swap triggers, handguards, and optics without sourcing proprietary parts. The ZEROED accessories that ship with the rifle are functional, but some buyers replace them with preferred aftermarket parts anyway.
Price is the main point of debate. The Endeavor Mk4 costs more than comparable 5.56 AR builds from some other manufacturers, and a few reviewers feel the CMMG premium isn't fully justified against alternatives at lower price points. Weight is mentioned occasionally. The 18-inch barrel adds some length and mass compared to a carbine, which matters in scenarios requiring active movement. Parts and accessories availability is noted as a concern relative to more common AR brands with deeper aftermarket ecosystems.
Price Range: $1213.09 - $1213.99
| Vendor | Price | Condition | Link |
|---|---|---|---|
| Kygunco Com | $1213.09 | New | Buy Now |
| Buds Gun Shop | $1213.99 | New | Buy Now |
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