Modular Driven Technologies | MDT TAC21 | Remington 700 Chassis

MDT TAC21 - www.combatrifle.com

MDT TAC21

MDT TAC21 20 inch Suppressed Modular Rifle – I decided to kick off the relaunch of this site with an entry level project of readily available hardware, nothing custom. As a barreled action I decided to use a Remington Model 700 SPS Tactical AAC-SD rifle at a cost of $650. The Remington Model 700 SPS Tactical AAC-SD has a threaded muzzle to accept an AAC-SD Sound Suppressor. I just happen to have an AAC 762-SDN-6 on hand.

Remington Model 700 Tactical Chassis www.combatrifle.com

Remington Model 700 Tactical Chassis

The rifle will be based on the Remington Model 700 Tactical Chassis with the key difference being a shorter 20″ threaded barrel.

Remington Model 700 SPS Tactical AAC-SD www.combatrifle.com

Remington Model 700 SPS Tactical AAC-SD

Remington Model 700 SPS Tactical AAC-SD

Remington Model 700 SPS Tactical AAC-SD features a Pillar bedded Ghillie Green Hogue over-molded stock. Heavy contour barrel has a 5/8-24 inch threaded muzzle to accept all AAC suppressors, flash hiders and muzzle brakes as well as other manufacturers of similar accessories. Shipped with a thread protector installed to shoot right out of the box or for the easy addition of accessories. Rate of twist, laser etched on the barrel, is optimized at 1:10 inches to stabilize 168 to 220 grain bullets as well as sub-sonic loads. X-Mark Pro externally adjustable trigger is set at the factory at 3 1/2 pounds with a 2 pound range of adjustment

The Model 700 SPS Tactical AAC SD Rifle, 308 (7.62×51 NATO) features a 20″ Heavy Barrel with 5/8-24 Threaded Muzzle. Shipped with Thread Protector Installed. Accepts AAC and all 5/8-24 Threaded Flash Hider, Muzzle Brake and Suppressor. 1 in 10″ Rate of Twist for 168 grain-220 grain Bullets and Sub-Sonic Loads. Hogue Overmolded Ghillie Green Pillar Bedded Stock. X-Mark Pro Externally Adjustable Trigger Set at 3 1/2 Pounds.

Note: Special thanks to the fine folks at Modular Driven Technologies for helping get this project off the ground by answering emails, a lot of them.


Modular Driven Technologies MDT TAC21 Chassis – Flat Dark Earth

Modular Driven Technologies TAC21 Chassis FDE www.combatrifle.com

Modular Driven Technologies TAC21 Chassis FDE

The chassis for this project is obviously the Remington 700 version of the MDT TAC21 finished in FDE (Flat Dark Earth Cerakote)


Rifle Basix Remington Trigger Erv-3 K

Rifle Basix Remington Trigger Erv-3 K www.combatrifle.com

Rifle Basix Remington Trigger Erv-3 K

We know we could always go with the safe bets of Timney Triggers and Jewell Triggers, however the Rifle Basix Remington Trigger Erv-3 K was selected mostly because we have not previously tested this trigger, the price is fair and it is readily available. We shall see how it performs.

Rifle Basix Remington Trigger Erv-3 K Remington after-market triggers feature state of the art CNC machined housings made from T6 6061 billet aluminium and are black anodized for a factory appearance. All internal levers are investment cast from A-2 tool steel, CNC machined and heat treated for excellent wear characteristics. The levers are now electro nickel plated for extra protection and bright appearance. Each Rifle Basix Remington trigger is hand assembled, mounted on a test action, adjusted within advertised specifications, tested for proper operation and safety function before packaging. These triggers are guaranteed as long as they are in service, and may be repaired or replaced at no charge at any time (providing they have not been modified). Rifle Basix Remington triggers are designed for USER installation. No cutting, grinding, fitting or stock modification for adjustment screw clearance. These triggers feature wide (factory width) finger levers. Rifle Basix triggers are designed to utilize Remington’s original safety levers both right and left hand. New mounting pins are shipped with each trigger. Our new “K” kits are packaged with safety levers and bolt stop release to service the 2006 and later Remington rifles with their new trigger design. Right hand only.


Advanced Armament AR-15/M16/AR 308 Style Blackout 51T Muzzle Brake 102320

This Advanced Armament AR-15/M16/AR 308 Style Blackout 51T Muzzle Brake 102320 is the only option I can utilize with my rifle and suppressor combination.


XLR Industries Tactical Lite Butt Stock

XLR Industries Tactical Lite Butt Stock www.combatrifle.com

XLR Industries Tactical Lite Butt Stock

One of the appeals of a modular rifle chassis like the MDT TAC21 is the ability to utilize an AR15 stock. I like a that idea a lot. I had originally considered installing a Magpul PRS. I like the PRS except for one thing, the weight. It comes in a nearly 2 pounds. Not set on a PRS I began looking around and I noticed a majority of the TAC21 builds utilize a PRS. So in an interesting twist I decided to go with the XLR Industries Tactical Lite Butt Stock. XLR Industries is also a manufacturer of modular rifle chassis. The Tactical Lite Butt Stock installed comes in about a half pound lighter than the Magpul PRS. Now it’s important to note that MDT offers a stock specifically for the TAC21 Chassis. The stock, the MDT Skeleton Rifle Stock V2 is essentially what appears to be a skeletonized PRS designed to only fit the TAC21 and not AR15 or AR10 rifles.


Magpul MIAD Pistol Grip

Magpul MIAD Pistol Grip www.combatrifle.com

Magpul MIAD Pistol Grip

The Magpul MIAD Pistol Grip was an easy selection. I like them and always have a few laying around.


Atlas BT46-LW17 Bipod

Atlas Bipod BT46 LW17 Bottom View www.combatrifle.com

Atlas Bipod BT46 LW17 Bottom View

The folks at B&T Industries, the manufacturers of the Atlas PSR line of Bipods were outstanding to deal with as I decided which bipod was best for this project. The Atlas Bipod BT46 LW17 is impressive in quality and function. One of the most expensive bipods available but worth every penny.

  • Construction from T6061
  • Type III Hard Anodized
  • Stainless steel springs & fasteners
  • 15 degrees +/- of preloaded PAN
  • 15 degrees +/- of preloaded CANT
  • Tooless Optional 3″ leg extensions
  • Tooless Optional Ski, Cleat and Spike feet
  • Estimated range of elevation is 5-9″ Standard
  • Estimated range of elevation is 7 – 13” Tall
  • 5 Leg positions
  • Novel 45 degree Leg position pioneered by B&T Industries L.L.C.
  • Heat Treated Stainless Steel Leg components
  • Fore and Aft pivot limiting Bosses
  • Non-Rotating Legs
  • Strengthened Leg Boss
  • Inner Leg constructed from T7075
  • Standard height weight – 13 ounces
  • Tall height weight – 15 ounces

Advanced Armament AAC 762 SDN-6 Sound Suppressor

Advanced Armament AAC 762 SDN-6 www.combatrifle.com

Advanced Armament AAC 762 SDN-6

The Advanced Armament AAC 762 SDN-6 Sound Suppressor is the only .308/7.62 Nato I presently own.


Modular Driven Technologies MDT AICS Style 10RD 308/7.62 Polymer Magazine

MDT AICS Style 10RD 308 Polymer Magazine www.combatrifle.com

MDT AICS Style 10RD 308 Polymer Magazine

Modular Driven Technologies provided us with this magazine. If all the reviews turn out to be true the MDT AICS Style 10RD 308 Polymer Magazines at $39.99 will be an absolute bargain for folks shooting an AICS compatible platform.


Vortex Viper PST 4-16×50 FFP Rifle scope with EBR-1 MOA PST-416F1-A

Vortex Viper PST 4-16×50 FFP Rifle Scope with EBR-1 MOA PST-416F1-A www.combatrifle.com

Vortex Viper PST 4-16×50 FFP Rifle Scope with EBR-1 MOA PST-416F1-A

Vortex Optics have become tremendously popular in recent years. Performance at a given price point is said to be comparable to more expensive competition.  I have zero experience with the brand so I figure what the heck. The Vortex Viper PST 4-16×50 Riflescopes with EBR-1 MOA PST-416S1 should suit my needs perfectly.


American Defense AD-RECON-S Scope Mount 30mm

American Defense AD-RECON-S Scope Mount 30mm www.combatrifle.com

American Defense AD-RECON-S Scope Mount 30mm

I was impressed enough with the American Defense QD mount on the Atlas Bipod that I decided I wanted to try out a American Defense AD-RECON-S Scope Mount 30mm on this project


MDT Chassis Accessory Rails – 5.0 Rail with QD Sling Point

MDT Chassis Accessory Rails www.combatrifle.com

MDT Chassis Accessory Rails

We need the MDT Chassis Accessory Rails – 5.0 Rail with QD Sling Point to utilize our Atlas Bipod.


MDT TAC21