X-BOW FMA Supersonic XL AR-15 | 120 lbs / up to 330 FPS Compact Compound Crossbow

The X-BOW FMA Supersonic XL AR-15 combines the extremely compact 120 lbs Supersonic compound platform with an AR-15-style shoulder stock. This provides more shoulder support and a more stable shooting position than the stockless Supersonic Basic while retaining the exceptionally narrow and compact Supersonic front end.

With a 120 lbs draw weight and speeds of up to 330 FPS, depending on the bolt used, this Supersonic delivers serious compound performance in a remarkably compact platform. Its integrated cable and lever cocking system also reduces the force the shooter actually needs to apply during cocking.

120 lbs and up to 330 FPS

The Supersonic XL AR-15 uses the same compact 120 lbs Supersonic compound front end as the other Supersonic configurations. Power stroke is approximately 7 inches / 17.8 cm. Actual velocity depends significantly on the type and weight of Supersonic bolt used.

• High Range bolts: approx. 300–330 FPS
• Standard bolts: approx. 280–300 FPS
• High Impact bolts: approx. 230–250 FPS

The maximum 330 FPS figure therefore applies to the lighter High Range bolts. Heavier High Impact bolts travel at a lower velocity. Do not choose bolts based on maximum FPS alone: select the correct bolt for the intended application and only use bolts suitable for the X-BOW FMA Supersonic.

AR-15-style shoulder stock

The key difference from the Supersonic Basic is the AR-15-style shoulder stock. It extends the platform to the rear and creates a defined shoulder support point, allowing the crossbow to be held more steadily against the shoulder and making a repeatable shooting position easier to achieve.

The design fits the Supersonic concept well: combining an exceptionally compact compound platform with sufficient support for controlled shoulder-supported aiming.

Some suppliers also refer to this configuration as the Supersonic XL L-Stock; this is the same AR-15-style shoulder stock.

Integrated cable and lever cocking system

The Supersonic features an integrated cable and lever cocking system. This mechanically draws the string into its cocked position without the need to attach a separate rope cocking device for every shot.

Although the nominal draw weight is 120 lbs, the force actually required during cocking is substantially lower. The integrated cocking system is therefore an important practical advantage of the Supersonic platform.

Exceptionally narrow compound front end

The Supersonic compound front end measures approximately 5 inches / 12.7 cm axle-to-axle when cocked and around 7.9 inches / 20.1 cm uncocked. This exceptionally narrow profile makes the Supersonic easy to handle and clearly differentiates it from conventional full-size recurve and compound crossbows.

Adjustable front grip and mounting rail

The adjustable front grip allows the support-hand position to be adapted to the shooter. A 19 mm mounting rail provides a mounting point for a compatible red dot or other suitable aiming device.

Basic, XL AR-15 or XL M4?

The different configurations use the same compact Supersonic platform but offer different shoulder-stock solutions:

• Supersonic Basic: no shoulder stock; the smallest and most minimalist configuration.
• Supersonic XL AR-15: AR-15-style shoulder stock, also referred to by some suppliers as L-Stock; additional shoulder support and stability with a relatively simple design.
• Supersonic XL M4: adjustable M4-style shoulder stock, also referred to by some suppliers as Triangle Stock; designed for greater adjustability and a more conventional shoulder-supported shooting position.

The XL AR-15 is therefore particularly attractive if you want more stability than the Basic provides while preferring a straightforward and functional shoulder configuration.

Key specifications

• Brand: X-BOW FMA
• Model: Supersonic XL AR-15
• Alternative name: Supersonic XL L-Stock
• Type: compact compound crossbow
• Draw weight: 120 lbs
• Bolt speed: approx. 230–330 FPS depending on bolt
• High Range bolts: approx. 300–330 FPS
• Standard bolts: approx. 280–300 FPS
• High Impact bolts: approx. 230–250 FPS
• Power stroke: approx. 7 inches / 17.8 cm
• Width cocked: approx. 5 inches / 12.7 cm axle-to-axle
• Width uncocked: approx. 7.9 inches / 20.1 cm axle-to-axle
• Cocking system: integrated cable / lever system
• Stock: AR-15-style shoulder stock
• Front grip: adjustable
• Safety: automatic safety
• Mounting rail: 19 mm
• Main frame: metal
• Limbs: fibreglass
• Colour: black

What's included?

The X-BOW FMA Supersonic XL AR-15 comes with:

• X-BOW FMA Supersonic XL AR-15 120 lbs crossbow
• AR-15-style shoulder stock
• 3 Supersonic bolts
• assembly hardware
• manual