MDT TAC21 20 inch Built From a Remington 700 SPS
MDT TAC21 RIFLE CHASSIS
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 the cost of $650. The Remington Model 700 SPS Tactical AAC-SD has a threaded muzzle to accept an AAC-SD Sound Suppressor, and I just happen to have an AAC 762-SDN-6 on hand.
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
Pillar bedded Ghillie Green Hogue over-molded stock. The heavy contour barrel has a 5/8-24 inch threaded muzzle to accept all AAC suppressors, flash hiders, muzzle brakes, and other manufacturers of similar accessories. It was shipped with a thread protector installed to shoot right out of the box or for the easy addition of accessories. The rate of twist, laser-etched on the barrel, is optimized at 1:10 inches to stabilize 168 to 220-grain bullets and 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. It ships with a 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 MDT TAC21 20-inch project off the ground by answering emails, a lot of them.
Modular Driven Technologies MDT TAC21 Rifle Chassis – Flat Dark Earth
The chassis for this project is the Remington 700 version of the MDT TAC21 finished in FDE (Flat Dark Earth Cerakote)
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 primarily selected 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 aluminum 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
One of the appeals of a modular rifle chassis like the MDT TAC21 is the ability to utilize an AR15 stock. I like 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 at nearly 2 pounds. Not set on a PRS, I began looking around and noticed that most 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 MDT Skeleton Rifle Stock V2 stock is essentially what appears to be a skeletonized PRS designed only to fit the TAC21 and not AR15 or AR10 rifles.
Magpul MIAD Pistol Grip
The Magpul MIAD Pistol Grip was an easy selection. I like them and always have a few lying around.
Atlas BT46-LW17 Bipod
Read the Atlas BT46-LW17 BIPOD Specs here at our Atlas BT46-LW17 Bipod page
- Construction from T6061
- Type III Hard Anodized
- Stainless steel springs & fasteners
- 15 degrees +/- of preloaded Pan
- 15 degrees +/- of preloaded CANT
- Tool-less Optional 3″ leg extensions
- Tool-less Optional Ski, Cleat, and Spike feet
- The estimated range of elevation is 5-9″ Standard
- The 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
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
Modular Driven Technologies provided us with this magazine. If all the reviews turn out to be accurate, 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 Riflescope with EBR-1 MOA PST-416F1-A
Vortex Optics has become tremendously popular in recent years. Performance at a given price point is said to be comparable to the 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.
The scope mount is turning out to be a difficult choice for this MDT TAC21 20-inch rifle project. There are many excellent mounts on the market. The AERO Precision Ultralight 30mm, Scope Mount is both economy of weight and cost. Looks nice, clean, and straightforward. Moving up in cost and weight is the American Defense Recon No Offset. The American Defense Recon No Offset is a robust mount with dual locking levers and substantial surface contact. Next up is the BOBRO Standard Precision Optic Mount. BOBRO, without question, makes some of the finest gear available.
While the current line of mounts is no longer as sleek and sexy as the earlier generations, they still retain BOBRO’s patented QD system, which in my opinion, is unrivaled at this time. Last but not least, the ugliest, most substantial, and most expensive is the SPUHR. The SPUHR is a square mount. The rings are cut cleverly at 45 degrees, there is a level built-in which is a big attraction, and the mount accepts bolt-on accessories for adding another Picatinny for a secondary sight. The SPUHR is not QD.
MDT Chassis Accessory Rails – 5.0 Rail with QD Sling Point
We need the MDT Chassis Accessory Rails – 5.0 Rail with QD Sling Point to utilize our Atlas Bipod.
MDT CHASSIS MDT TAC21 20 inch Suppressed Modular Rifle