Guns and Gear

TEC-GIII Rifle – An AR10 That Takes G3 Magazines


Ever wanted a G3-pattern rifle with the familiar controls of an AR? Ever wished your AR-10 could feed from G3 mags? Well, 21st TEC have you covered with their TEC-GIII. The rifle is available in both 6.5 Creedmoor and .308 Winchester, weighs in at 8.5 lbs, has 20in barrels and feeds from 20-round G3 mags. MSRP for the TEC-GIII, in both 6.5 Creedmoor and .308 Win, is $1,499.

21st TEC @ TFB:


Here’s 21st TEC’s full announcement on the TEC-GIII:

21st Tec® is excited to expand the AR10 (DPMS/LR308 Pattern) market with the release of the TEC-GIII Rifle, a refined platform chambered in .308/7.62 NATO and 6.5 Creedmoor. The TEC-GIII rises to meet the demands of both enthusiasts and professionals by integrating the proven functionality of G3 magazines with the familiar and trusted components of the AR10 platform.

Featuring a Direct Impingement (DI) system, the TEC-GIII is available with a choice of barrel lengths: a 16-inch option chambered in .308/7.62 NATO with a 1:10 twist for balanced maneuverability, or a 20- inch variant with a 1:8 twist chambered in 6.5 Creedmoor for long-range precision. The rifle’s receivers are precision-machined from Billet T6 Aircraft Aluminum, ensuring a solid foundation for sustained durability. An adjustable gas block enables the rifle to be tuned for suppressor use, while the controls adhere to the standard safe and semi-automatic settings for user familiarity.

The TEC-GIII caters to operator comfort with a Mil-Spec buffer tube, a 6-position adjustable CCS Carbine stock, and a THRIL RTG grip, allowing for a customized fit. A 15-inch M-LOK handguard, featuring an integrated MIL1913 Rail, offers ample space for accessories. The rifle’s balance is optimized with a weight of 8.5lbs and an adjustable overall length from 35 to 39 inches, providing a comfortable and adaptable shooting platform. Additionally, the TEC-GIII is fitted with a Nickel Boron Trigger for a smooth, consistent pull and a Flash Hider with 5/8×24 muzzle threads.

The rifle is available in two durable finishes: Type III Hard Coat Anodized Black or FDE. Enhancing its value, the TEC-GIII ships with three high-quality German-made G3 magazines. The specially designed BCG operates seamlessly with G3 metal magazines and is complemented by a cam-pin wear plate located in the upper receiver.

The TEC-GIII Rifle stands as a significant offering from 21st Tec®, ready for delivery on December 15th, 2023, with an MSRP of $1499. The rifle’s compatibility with a broad range of DPMS pattern LR308/AR10 components affirms its position as a versatile and maintenance-friendly firearm.

21st Tec® prides itself as a pioneer in the firearms industry, infusing over 20 years of manufacturing prowess into every product. Our commitment is to innovation, using premium American raw materials to craft firearms that meet the evolving needs of today’s marksman. Each TEC-GIII rifle embodies our dedication to quality, designed to serve reliably for years to come.

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Matthew Moss

Matthew Moss

_________________________________________________________________________ – Managing Editor – Managing Editor

Matt is a British historian specialising in small arms development and military history. He has written several books and for a variety of publications in both the US and UK. He also runs Historical Firearms, a blog that explores the history, development and use of firearms. Matt is also co-founder of The Armourer’s Bench, a video series on historically significant small arms.

Here on TFB he covers product and current military small arms news.

Reach Matt at: [email protected]

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