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TACMOD Sniper Chassis System

Written by Tactical Response Staff

KFSIndustries has designed, developed and produced a state-of-the-art chassis for the Remington 700 rifle. Remove two screws from the existing Model 700 and the barreled action simply drops in. The result is a fully free-floated stock and an action that now accepts high-capacity Accuracy International box magazines.

The TACMOD™ system is made up of three separate parts: the aircraft aluminum, folding stock, the Mil-Spec Sierra 7™ bipod and the robust, multiple-optic scope mount, MOSM™. It is all Made in the USA…designed, machined and assembled at the KFS factory in Atlanta.

The TACMOD system is the answer to the need for a smaller overall rifle package without compromising either durability or repeatable accuracy. More than that, the TACMOD is configurable to any Remington 700 caliber or barrel length. It offers mounting rail options not found on the factory stock, and a fully adjustable cheekpiece.

Just as important TACMOD converts the Remington 700 from a fixed magazine to a box magazine. The TACMOD uses Accuracy International mags, either 5-round or 10-round versions. A box magazine means both more rapid reloading and a fast way to change between types of ammo, from anti-glass Tactical to open-air Match, for example.

Unlike some aftermarket stocks, the TACMOD stock does not require the removal of the trigger assembly! There is an obvious liability any time the trigger assembly is tampered with. The stock design is a simple drop-in with no fitting required. It is a free-floating design, of course, so there is no need for glass-bedding the barrel. Simply remove the two mounting screws, lift the barreled action out, and bolt it to the TACMOD stock for the system upgrade. Torque the mounting screws to 65-inch pounds.

The TACMOD stock is machined from aircraft-grade 6061 aluminum on state-of-the-art Computer Numerically Controlled (CNC) machines. The TACMOD has a black Mil-Spec, Class III hard anodize finish. Other finished, i.e., Dark Green, are available as a special order. The TACMOD stock uses a multiple finger groove M16/M4 pistol grip for the most traditional feel.

The TACMOD stock can be retrofitted to virtually any generation of Remington 700 action and any style of barrel including the Police and the various fluted barrels. The TACMOD stock is available for the Remington 700 Short Action (223 Rem and 308 Win, for example) in either Right Hand or Left Hand. The TACMOD is also available for the Remington 700 Long Action (7mm Rem Mag and 300 Win Mag, for example).

The TACMOD Sniper Chassis System dates back to 2008 and the efforts of Aaron Hampton, USA (ret). Hampton is the former team leader of the Army’s Marksmanship Unit (USAMU). The system was originally developed for the Remington Model 700 as a logical product improvement over both the US Army M24 Sniper Weapon System and the USMC M40A3 Sniper Rifle.

The TACMOD stock has been upgraded a couple of times since the USAMU concept stock. The most significant has been the extended, Picatinny mount multiple rails. The most recent product improvement has been to the hinge of the folding stock. The hinge is the weak point on most folding stock designs. When extended, the stock on a sniper rifle must be absolutely rigid, completely solid, no movement or play whatsoever. The Gen 2 hinge is all of that.

The original design was a push-button lockup based on the Russian/Chinese AK side folder. This hinge was just not robust enough and it didn’t lock up tight enough. The current hinge design is based on the Israeli Galil folding stock. That said, the TACMOD hinge is even beefier with twice the material.

The Gen 2 hinge locks up tight. No movement while aiming. No give under recoil. The TACMOD hinge is, in fact, massive and almost over-designed. It is as good as the best in the industry. Both the Right Hand and the Left Hand versions fold to the left side, which frees up the bolt action lever.

The TACMOD chassis comes as a folding stock, which is one of the benefits of the sniper system. A non-folding attachment is available but by special order only and a custom fabrication lead time is involved. As rugged and rigid as the folding version proved to be during our range time, a non-folding version simply is not necessary.

The TACMOD stock uses a fully adjustable, up/down cheekpiece molded from anti-microbial Kydex® plastic. It also uses a fully adjustable, fore/aft buttplate. Together, the TACMOD can be customized to the rifleman. The length of pull is adjustable from between 13.8 and 16.8 inches. The buttstock itself can be quickly detached for storage and/or transport.

The TACMOD Sniper Chassis System is modular, which allows for the addition or removal of Picatinny rails along the barrel. Our T&E unit had the popular quad-rail: a Picatinny mount on top of, below and both sides of the barrel. Other fore end and rail designs, including a smooth fore end with no rails, are available. The modern sniper wants as many rails as possible, which makes the quad-rail fore end perfect.

 

Sierra 7 Bipod

KFS Industries is famous for their ruggedized Versa-Pod bipods. See the cover story in the July-August 2013 issue of Tactical Response. (www.hendonpub.com, Resources, Article Archives).

However, the Sierra 7 Bipod is not a version of the Versa-Pod. The Sierra 7 is a brand-new, clean sheet design. It was designed specifically to meet the US Army bipod requirements for the Compact Semi-Auto Sniper System, (CSASS) or M110 Carbine. KFS Industries based their totally new Sierra 7 Bipod on input from Daniel Horner, USAMU top 3-gun shooter.

The semi-auto, 7.62 NATO caliber, M110 SASS is intended to replace the bolt-action 7.62 NATO caliber M24 Sniper Weapon System. The CSASS will be a shorter and lighter version of the M110 SASS.

Importantly, the June 2014 Request For Proposal included some brand-new requirements for a bipod. One new requirement for the M110 CSASS bipod is that the legs can be set at a 45-degree forward angle and locked into place. This allows the rifleman to lean into the rifle, to preload the rifle-bipod system, before shooting. This preload makes a big difference in how the 7.62 NATO rifle performs downrange.

The Sierra 7 Bipod was specifically designed to lock the legs in six different fore-aft positions: 0, 45, 90, 135, and 180 degrees. The Sierra 7 Bipod fits any Picatinny rail and is available separately from the entire TACMOD system.

The Sierra 7 Bipod comes with the unique KFS “Raptor” feet. With the Army’s needs in mind, the foot positioning of the Raptor has been changed for the Sierra 7: One of the spikes now points straight down. A less aggressive bipod foot, the round neoprene pad, is also available and easily interchangeable. A steel “sled” foot, larger than the Versa-Pod version, will be available soon.

Like the hinge in the TACMOD folding stock, the totally new Sierra 7 Bipod is almost over-designed for durability. It has twice the weight and material of the hunting-grade competition. The Sierra 7 Bipod is aluminum where it can be but forged steel where it needs to be. The steel parts are not castings; instead they are forgings, machined from a large steel billet. The totally new design also uses legs set out at a much wider and more stable stance. The entire Sierra 7 Bipod has tighter tolerances and closer fits than anything in their own Versa-Pod line.

There are two major differences between the new Mil-Spec Sierra 7 Bipod and the current generations of Made-in-USA Versa-Pod bipod. The first is the ability of the Sierra 7 to rigidly lock the bipod legs at a precise angle forward or backward.

The second is the range of motion on the Sierra 7. The ability of the Versa-Pod to allow muzzle-up and muzzle-down movement was seen as a distraction during police and military sniper operations. This friction-controlled movement may have good hunting applications but not so much for police and military sniper operations. This vertical movement has been eliminated on the Sierra 7 Bipod.

The Sierra 7 Bipod has both axial rotation (cant) ability and horizontal tracking (pan) ability. The bipod will cant along a 60-degree arc. The bipod will track along a 90-degree arc. The pan tracking is especially smooth—the bipod head moves on a needle bearing, which is fully enclosed to protect against dust and moisture. The use of an actual bearing is just another example of over-design by KFS. They know it often takes an over-design to always function in police and military scenarios.

The angle adjustment is made by rotating the bipod legs on a spring-loaded clutch-type lock. The clutch has deep notches for positive and repeatable leg angles. In other words, 45 degrees forward is always exactly 45 degrees, and for both legs. The Sierra 7 Bipod is currently available in two different versions: 7- to 9-inch adjustments and 9- to 12-inch adjustments. Both configurations are available with either steel Raptor feet or Santoprene® rubber feet.

Of course, the leg length is spring-loaded adjustable and adjustable with one hand. The adjustment claw makes positive and repeatable contact with deeply machined notched in the bipod legs. No friction point that is certain to be different side to side each time the legs are deployed and are likely to slip under the force of use. In fact, the Sierra 7 Bipod, with legs fully deployed, can withstand a 1,000-pound load before failure.

 

Multiple-Optic Scope Mount

The Multiple Optic Scope Mount (MOSM) is just what it says. The rugged scope mount rings are drilled and tapped to accept small Picatinny rails. These short rails can accept a wide variety of small devices and accessories. Four screws mount the auxiliary rails to each scope ring. The rails are reversible, extending forward of the ring or rearward from the ring, whatever is required to fit the device and scope.

Why multiple sights? First, the added optic serves as a back-up sight. Few true sniper rifles have back-up iron sights. Yet some sort of back-up sight is needed for at least two reasons. The most obvious one is the failure of the main optic. Even today’s ruggedized scopes can fail. The other reason is a unique engagement scenario. The most obvious is the use of a 100-yard zero sniper rifle used to take a quick, close-range shot. At least one police sniper made a 10-yard shot against a fast-closing doper who had discovered the surveillance team.

Again, the MOSM was designed with the military in mind. The main purpose was to be a ruggedized attachment point for small Picatinny rails. The key to the ruggedness—compared to the competition—is how KFS mounts their auxiliary Picatinny rails.

With most other designs, the auxiliary rails are mounted with vertical screws. That means the heavy recoil becomes a shearing force exerted directly on the shank of the screw. The heavier the attached device, the more force exerted on the cross-section of a small screw. With the KFS MOSM, the auxiliary rails attach around the scope ring mount. The rails are held in place with horizontal screws. All of the recoil force is absorbed by the main scope mount and none of it by the auxiliary rail screws.

The KFS MOSM Multiple Optic Scope Mount is available for 30mm and 34mm scope tubes. The trend in tactical and military scopes is toward 34mm. The MOSM is not available for a 1-inch tube. The MOSM comes in two versions. Both will accept three auxiliary rails. The Alpha is an ultra-rugged mount with a circular array of mounting options all around the scope mount rings. It includes a bubble-level adjustment tool. The Bravo is a lightweight scope mount with side and top attachment systems but no bubble level.

The MOSM is a true one-piece mount that eliminates any misalignment or pressure spots during scope installation. The body of the mount and the lower half of the scope rings are machined from a single billet of 7075 aircraft aluminum. The billet is clamped in a 5th axis CNC machining center and is machined, drilled and tapped all is one setup.

For added ruggedness, the MOSM uses stainless-steel inserts in the aluminum body to accept Unbrako® cap screws. Like the Sierra 7 Bipod, the Made-in-USA MOSM scope mount meets the US Army’s requirements for the CSASS rifle project. The MOSM fits any Picatinny rail and is designed to keep the optic as close to the bore as possible. The center of the objective lens is 1.44 inches above the rail.

 

Time on the Range

We spent quite a few hours on a couple of different days at the range with the TACMOD Sniper Chassis System. The barreled action is something you drop in, and the barrel is fully free-floating. So the shooting impressions are more how all of the accessories worked and less how accurate the particular barreled action was. We used Federal Premium 308 Win 168-grain Match HPBT ammo during all the shooting. All the groups were sub-MOA.

The Sierra 7 Bipod was fast and easy to deploy. The Raptor claw feet are outstanding and a perfect fit for many police sniper scenarios. Of course, the rubber feet are options and easy to swap out. We shot at the 45-degree forward position and the lockup was absolutely solid during both recoil and recovery. The cant and pan were both glass smooth. The legs are held in position by the heavily notched clutch and the clutch is held together by heavy spring pressure. To adjust the angle of the legs, simply pull the leg against the spring pressure beyond the castellated clutch and rotate.

With the spring-loaded locking levers, the friction in the Sierra 7 Bipod was easy to adjust. The adjusting latches are spring-tensioned. Simply rotate the latch to get the right amount of friction, then lift the latch against spring pressure and rotate it to whatever position along the bipod you want. The friction on the cant/track remains unchanged. When everything was spring-loaded, lever-locked in place, the whole bipod acted as one solid piece fastened to the rifle. No movement. No give. No play.

The TACMOD stock was very easy to tweak for the exact length of pull and the exact cheekpiece height. Most of all, the folding stock proved to lock up absolutely tight. Two ramp claws engage one another. These lock tighter and tighter with pressure exerted on the stock. There was no stock movement whatsoever at any time during aiming or recoil.

To open the folding stock, push down hard on the hinge of the folding section, and again push down hard in the same spot to close it. In return, you get one of the most precision-made, closest-fitting, solid lockup folding stocks available anywhere in the world.

The TACMOD system does not necessarily make the rifle lighter. A standard Remington Model 700-P with fiberglass stock, 1-inch tube scope, standard rings and hunting bipod weighs about 11 pounds. In comparison, the Remington 700-P with TACMOD stock, 30mm scope, heavy-duty rings and Sierra 7 bipod weighs about 17 pounds.

A major benefit of the TACMOD Sniper Chassis System was seen before we even got to the range: the compact size of the overall rifle with the stock folded. Today’s police vehicles are getting smaller: Big sedans are now mid-size sedans and full-size SUVs are now sedan-based crossovers.

Interiors are getting smaller. Trunks are getting smaller. We carry more gear than ever. The pressure to make police gear more compact affects even specialized gear like sniper rifles. Of course, it is easier to move into position with a shorter rifle than a longer rifle.

KFS Industries currently manufacturers all of the components in the TACMOD Sniper Chassis System. The TACMOD stock, the Sierra 7 bipod and the MOSM scope mount are also all available separately. Everything is handled through the KFS distributor network.

 


Published in Tactical Response, Jul/Aug 2014

Rating : 5.0


Comments

Comment on This Article

Fact check

By Kasey Beltz

"Importantly, the June 2014 Request For Proposal included some brand-new requirements for a bipod. One new requirement for the M110 CSASS bipod is that the legs can be set at a 45-degree forward angle and locked into place."

Actually the Military PSR contract also required a bipod that would allow for the legs to lock at a 45 degree position in addition to the ability to pan and cant.

It so happens it is the American made Atlas bipod released in 2008, (see here - http://www.accu-shot.com/Atlas_Bipods.php ) that pioneered this patented additional 45* leg position that was awarded the above mentioned contract. http://www.thetruthaboutguns.com/2013/09/robert-farago/remington-scores-80m-psr-ussocom-contract/

It always best to give credit where credit is due.

Thank you for your time and considerations.

Submitted Sep 8 at 7:45 AM

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