Viper S400 Crossbow Logo

Viper S400


Viper S400 Crossbow Quartering Away Studio Image
ACUslide Cocking and De-Cocking System
Provides silent cocking and safe de-cocking.
Nitro 505
S1 Trigger
2-stage, zero-creep design features a roller sear system that sets a new standard in high performance crossbow accuracy.
RangeMaster Pro Scope
Featuring multi-coated glass for optimal light gathering, the variable speed scope includes lighted aiming points for precision down-range accuracy.
Close-up of TenPoint RangeMaster Scope.
TEC-X Stock
Dramatically minimizes stock size, reducing the weight of the crossbow by 1/2-pound.
Close-up of TenPoint TEC-X Stock
Micro-Trac Barrel
Reduces string-to-rail contact by an incredible 50% to provide longest string life in the industry - surpassing "rail-less" crossbows by hundreds of shots.
Close-up of TenPoint Micro-Trac Barrel.
4.6 / 5.0
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why buy tenpoint?

why buy tenpoint?

Which TenPoint Crossbow is right for you?

Viper S400 in the Woods
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Others De-Cock. We Do It Safely.
Our customers have spoken
4.6 / 5.0
It was smacking 20 on the range with no worries. I had to bring it back to the farm for any type of hunting distance. 3 shots later I’m smacking 50-yard bulls. (freehand) It is a nice bow that shoots great. I would recommend.
This bow is phenomenal. Its accuracy is unapparelled. I put 200 shots through the Viper today. I don't know what you did to the strings and cables but they never show any wear. I haven't put anything on the strings or even used any rail lube. This is the perfect crossbow.
Todd Bromley
This crossbow fits everything a crossbow hunter would want. The accuracy is unbelievable, with a superb trigger. The new cocking device makes loading and shooting a breeze. Can't think a a single change to make it any better.
Retired Al
Safe De-Cocking

Safe De-Cocking

Forget holding buttons, using straps, and losing control while de-cocking. Meet TenPoint’s new ACUslide – The only safe and controlled crossbow de-cocking system on the market. Simply backwind the handle – stopping at any point without fear of damage, injury, or losing control.


The Viper S400 measures an ultra-narrow 7.2-inches wide – giving you more shot opportunities in tight shooting situations.
48% More Accurate

48% More Accurate

Stainless steel latch locks the trigger box at full-draw – relieving the tension from the ACUslide unit and guaranteeing that your trigger box is in the same location on each shot, leading to 48% increased down-range accuracy.
Greater Trigger Control

Greater Trigger Control

3 1/2-pound, 2-stage, zero-creep trigger gives you greater trigger control – leading to tighter groups and same hole down-range accuracy.


TenPoint crossbows are the safest on the market, boasting an unmatched combination of safety features, including our ACUslide cocking and de-cocking system, Dry-Fire-Inhibitor, and safety wings.


One of the shortest forward-draw hunting crossbows we have ever produced, the light-weight Viper S400 measures just 32-inches in length yet delivers speeds up to 400 FPS and is sold as a crossbow package. Featuring the revolutionary ACUslide silent cocking and safe de-cocking system, this ultra-compact hunting crossbow measures an ultra-narrow 7.2-inches wide and features a 3.5 pound, 2-stage, zero-creep S1 trigger that delivers our most crisp, consistent break ever. If you are looking for the ultimate hunting crossbow package, look no further than the Viper S400.

Crossbow Hunting Package Includes:

  • Optics: RangeMaster Pro Scope mounted on a machined aluminum 7/8-inch Fixed Dovetail Mount
  • Cocking Device: ACUslide Cocking and De-Cocking System
  • Quiver: 6-Arrow Tech Quiver
  • Crossbow Arrows: Three Evo-X CenterPunch premium carbon arrows with 100-grain practice points

TenPoint Viper S400 Crossbow
How to Cock and De-Cock Your Crossbow with the ACUslide
Assisting the ACUslide Trigger Box Down the Flight Rail
Importance of Backwinding the Crank Handle on an ACUslide Unit
How to Remove the Trigger Box From the Bowstring Using the ACUslide Cocking and De-Cocking System
How To Free the Bowstring From the DFI on ACUslide Series Crossbows
Maintenance Requirements for High-Performance Crossbows

Length (w/o foot stirrup) 32"
Width Axle-to-Axle (uncocked/cocked) 11" / 7.2"
Power Stroke 11"
Weight (w/out accessories) 7.5 lbs.
Speed/KE: Pro Elite 400 Carbon Arrow (415-grains) 400 FPS / 142 FP KE
Speed/KE: EVO-X CenterPunch Carbon Arrow (465-grains) 380 FPS / 149 FP KE
Draw style Forward Draw
Draw Weight 250
Safe De-Cocking ACUslide

Viper S400 Crossbow Top-Down Studio Image
Viper S400
Price $1,449.99
Speed 400 FPS / 135 FP KE
Length 32"
Width 11" / 7.2"
Power Stroke 11"
Weight 7.5 lbs.
Draw Style  Forward Draw
Top-down image of TenPoint Vengent S440 crossbow.
Vengent S440
440 FPS / 166 FP KE
11" / 5.8"
7.7 lbs.
Forward Draw
Turbo S1 Crossbow
Turbo S1
390 FPS / 141 FP KE
11" / 7.2"
7.3 lbs. (with ACUslide)
Forward Draw
Siege RS410 (Veil Alpine) Top
Siege RS410
410 FPS / 149 FP KE
12" / 7.5"
7.5 lbs. (with ACUslide)


  • Fastest Crossbow in the World
  • Fastest Compact Crossbow in the World
  • Safe De-Cocking
  • Cocking Force Required
  • String Life (#of shots)
  • Weight
  • Ability to Remain Cocked All Day
  • Rest Life
  • Industry Leading Silence
  • Warranty
  • Years of Crossbow Innovation

  • 505 FPS

  • 460 FPS

  • ACUslide and ACUdraw De-Cock (11 models)

  • 5 lbs.

  • more than 500 shots
  • 7.5-7.8 lbs.
  • Unlimited

  • Limited Lifetime

  • 28 years

  • 500 FPS

  • 400 FPS

  • (1 model)

  • 12-17 lbs.

  • less than 400 shots
  • 6.5-9.9 lbs.

  • less than 8 hours

  • Subject to Breakage

  • Limited 5 Year

  • 5 years
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