The Magpul PRS Gen 3 is an American adjustable precision stock designed by Magpul Industries for the AR-15 and AR-10 platform rifles. Introduced as the third generation of the acclaimed PRS (Precision Rifle/Sniper) series, it offers tool-free shot length and cheek height adjustments, making it one of the go-to benchmarks for snipers and PRS competitors.
History and Development of the Magpul PRS Gen 3
Magpul Industries, founded in 1999 in Texas, has quickly established itself as one of the leading American manufacturers of gun accessories. The PRS range, launched in the early 2000s, was developed to meet the needs of civilian and military snipers looking for a stock that offers both the robustness of a fixed stock and the modularity of an adjustable system.
The first generation (PRS Gen 1) introduced the concept of the precision-adjustable stock for semi-automatic rifles, quickly equipping many rifles used in long-range shooting competitions and in the armed forces. The Gen 2 has brought improvements to the adjustment knobs and the mounting. Launched in the late 2010s, the PRS Gen 3 marks a major evolution: it abandons the use of tools for adjustments thanks to new machined aluminum dials, integrates M-LOK slots for mounting a monopod, and improves the overall strength of the butt plate.
Technical Specifications
| Feature | Specification |
|---|---|
| Official designation | PRS Gen3 Precision-Adjustable Stock (MAG672) |
| Country of Origin | United States |
| Manufacturer | Magpul Industries Corp. |
| Fixed stock type | , precision-adjustable |
| AR-15 / M16 / AR-10 / SR-25 | compatible platform |
| Mil-spec rifle, A5, rifle-length | compatible tubes |
| Weight (stock only) | ≈ 788 g (27.8 oz) |
| Mounted weight (rifle) | ≈ 899 g (31.7 oz) |
| Maximum length | 292 to 328 mm (11.5 to 12.9 in) |
| Shot Length Adjustment (LOP) | ≈ 36 mm (1.4 in) |
| Cheek Height Adjustment | ≈ 20 mm (0.8 in) |
| Rubber butt plate | , adjustable in height and tilt |
| Fasteners Straps | QD Anti-Rotation Inserts |
| Accessory rail | M-LOK slots in the lower part |
| Maximum caliber | supported.50 BMG (extreme recoil) |
| Colour | Black, FDE (Flat Dark Earth), Grey |
Operation and Technical Particularities
The PRS Gen 3 is distinguished by its fully manual and tool-free adjustment system. Two machined aluminum dials allow the shooter to change the shot length (LOP) and cheek rest height in seconds. Each fit has positive locking detents that ensure a firm attachment with no play or interfering vibrations when firing.
The rubber butt plate is itself adjustable in height and inclination, allowing the shoulder to be adapted to the shooter’s morphology or shooting position (lying, sitting, on support). On the lower part, two M-LOK slots accept a rear monopod or any other compatible accessory, making it a major asset for long-distance shooting in a prone position.
The PRS Gen 3 also has anti-rotation QD inserts on both sides for attaching shoulder straps, and a reinforced butt plate capable of withstanding the recoil of heavy weapons up to .50 BMG caliber, which also makes it suitable for large-caliber sniper rifles.
Variants and Versions
The PRS Gen 3 is available in three main colours: black, Flat Dark Earth (FDE) and grey. Magpul also offers in the same family the PRS Lite (lighter version), the PRS Gen 2 (previous model still produced in certain colors) and the PRS Gen 3 specific for non-AR rifles (including versions adapted to the Remington 700, AICS, or bolt-action platforms). All share the same precision-adjustable philosophy but differ in fastening methods and weight.
Users and Areas of Use
The Magpul PRS Gen 3 is widely adopted by competitors in the PRS (Precision Rifle Series) discipline in the United States and Europe, as well as by long-range hunters and civilian sport shooters. It also equips military units and law enforcement in several countries, notably mounted on Mk12 SPR sniper rifles or SR-25 derivatives. Its robustness and reliable adjustments make it a preferred choice for builds dedicated to long-range target sniping.
Civil Possession in Switzerland
In Switzerland, the Magpul PRS Gen 3 stock is freely available for purchase from specialist gunsmiths and dedicated marketplaces such as nextgun.ch. As a weapon accessory, its mere acquisition is not subject to a specific permit. On the other hand, the rifle on which it is mounted must itself comply with the Federal Weapons Act (Arms Act). For semi-automatic versions of AR-15 or AR-10 rifles, the acquisition requires a weapons acquisition permit issued by the competent cantonal authority. The conditions include: being at least 18 years old, not being under general guardianship, and not presenting a reason for refusal within the meaning of Art. 8 (2) Arms Act. Since the 2019 revision, semi-automatic rifles with a magazine of more than 10 rounds have been classified as prohibited weapons subject to an exceptional cantonal authorisation.
Conclusion
The Magpul PRS Gen 3 has established itself as the undisputed benchmark for precision stocks for AR-15 and AR-10 platforms. Its balance between robustness, modularity and precision of settings has made it a standard for PRS competitors, long-range shooters and some military units. Although its relatively high weight makes it more suitable for pure precision applications rather than light tactical uses, it remains one of the most iconic accessories in the Magpul range and a safe choice for any build dedicated to modern precision shooting.
