The Magpul UCS (Universal Carbine Stock) in Olive Drab Green is a highly adjustable, modern stock purpose-built for shooters running AR-pattern rifles and other firearms equipped with M1913 Picatinny rails instead of traditional buffer tubes. Whether you're building a precision rifle, a tactical carbine, or a specialized platform like a Sig MCX, SIG MPX, FN SCAR, or CZ Scorpion, the UCS lets you dial in your ideal setup without guesswork—or tools.

What sets the UCS apart is its flexibility across multiple adjustment axes. The stock offers three inches of length-of-pull (LOP) adjustment spread across six detent positions, so it fits shooters of all sizes and accommodates body armor or heavy gear. Two reversible cheek risers (0.50" and 0.75") stack to customize your sight picture height, and the reversible M1913 clamp adds another half-slot of vertical adjustment. A five-degree drop angle built into the hinge clears charging handles and ejection ports on unconventional platforms. The reversible folding mechanism flips to suit left- or right-handed setups, and the integrated QD socket accepts sling loops in either orientation. Weighing just 1.1 lbs and molded in Magpul's durable polymer, the UCS is made in the USA and compatible with MOE SL and DT butt-pads if you want to customize further.

The UCS shines when you need a stock that adapts to your gun, not the other way around. It's the platform-agnostic choice for shooters tired of one-size-fits-none designs.

Key Features

• Three inches of length-of-pull adjustment across six detent positions
• Two reversible cheek risers (0.50" and 0.75") for comb height customization
• Reversible M1913 clamp with half-slot height adjustment
• Five-degree drop angle for charging handle and ejection port clearance
• Reversible folding mechanism for left or right configuration
• Reversible, anti-rotation QD socket for sling attachment
• Compatible with MOE SL and DT butt-pads
• Lightweight at 1.1 lbs; made in the USA

Specifications

Length of Pull Adjustment Range	3 inches (6 positions)
Overall Length (Range)	7.6 – 10.6 inches
Height at Butt Plate	5.3 inches
Weight	1.1 lbs
Width (at hinge)	1.9 inches maximum
Included Cheek Risers	0.50" and 0.75" (reversible)
Color	Olive Drab Green
Drop Angle	5 degrees

Frequently Asked Questions

What rifles and platforms is the Magpul UCS stock compatible with?

The UCS is designed for any firearm equipped with an M1913 Picatinny rail on the rear of the receiver, including the SIG MPX and MCX, FN SCAR, IWI Galil, CZ Scorpion, Ruger LC Carbine, PSA AK/AK-V, Brownells BRN-180, and certain other AK variants. Exact LOP ranges vary by platform—for example, the SIG MCX achieves 11.3–14.3 inches, while the Ruger LC Carbine reaches 13.3–16.3 inches.

Does the UCS work with armor or heavy gear?

Yes. The UCS offers three inches of length-of-pull adjustment across six positions specifically to accommodate shooters wearing body armor, tactical vests, or other bulky equipment. Two reversible cheek risers and an adjustable M1913 clamp provide additional height and position customization.

What does the UCS include?

The UCS ships with two reversible cheek risers (0.50" and 0.75") and a reversible M1913 clamp. It also features an integrated, reversible QD socket for sling attachment and is compatible with MOE SL and DT butt-pads sold separately.

Can I set up the UCS for left-handed or right-handed folding?

Yes. The UCS features a reversible hinge that allows you to configure the stock to fold either left or right, and the QD socket is also reversible to orient sling loops as needed.