Kansas Gunshop is a Wichita, KS-based retailer specializing in firearms and accessories. The P308 308 Win. Gas Piston Gen 4 Rifle with 20 inch Barrel is a reliable, gas piston-driven rifle chambered in .308 Winchester. Its Gen 4 gas piston system offers cleaner operation and consistent performance. Available now for $299.00.
Reviewed by Derek, Owner & FFL Holder at Kansas Gunshop. Kansas-licensed FFL dealer since 2008, NRA Range Safety Officer.
Last updated: April 2026
What are the specifications of the P308 308 Win. Gas Piston Gen 4 Rifle?
| Product Type | Semi-automatic Rifle |
|---|---|
| Caliber | .308 Winchester (7.62x51mm NATO) |
| Action | Gas Piston, Short Stroke |
| Barrel Length | 20 inches |
| Barrel Material | Chrome Moly Vanadium Steel |
| Rifling | 1:10 Twist |
| Finish | Black Anodized |
| Operating System | Gen 4 Gas Piston |
| Weight (unloaded) | Approx. 8.5 lbs |
| Overall Length | Approx. 38.5 inches (collapsed) |
| Compatibility | DPMS pattern .308 magazines |
| Country of Origin | USA |
| Condition | New |
| SKU | P308-20-GP4 |
What are the key features of this P308 rifle?
- Gas Piston Operating System: This rifle utilizes a Gen 4 gas piston system, which means less carbon fouling in the receiver compared to direct impingement systems. This can lead to increased reliability and less frequent cleaning, especially during extended shooting sessions.
- Chambered in .308 Winchester: The .308 Win. cartridge is a versatile and effective round, suitable for a range of applications from hunting medium-to-large game to target shooting at longer distances. Its widespread availability is also a practical consideration.
- 20-inch Barrel: A 20-inch barrel provides a good balance between muzzle velocity and maneuverability. For the .308 Win. cartridge, this barrel length allows for effective use of the cartridge’s ballistic potential while still being manageable in the field or at the range.
- Enhanced Reliability: The gas piston system, combined with robust construction, aims to provide consistent cycling and operation, even in varied environmental conditions.
- Standardized Platform: Built on an AR-style platform, this P308 308 Win. gas piston Gen 4 rifle with 20 inch barrel allows for compatibility with a wide array of aftermarket parts and accessories, including optics, stocks, and grips.
Who is the P308 308 Win. Gas Piston Gen 4 Rifle for?
Buy it if:
- ✅ You’re looking for a .308 Win. semi-automatic rifle that runs cleaner than a direct impingement system.
- ✅ You appreciate the modularity and aftermarket support of the AR platform in a larger caliber.
- ✅ You need a rifle suitable for hunting deer, hogs, or other medium-to-large game in Kansas or elsewhere.
- ✅ You’re interested in a rifle for long-range target shooting or precision applications where the .308 Win. excels.
- ✅ You want a gas piston rifle without the premium price tag often associated with some manufacturers.
Skip it if:
- ❌ You require the absolute lightest possible rifle for extreme portability (see our lightweight AR-15 options).
- ❌ You prefer the simplicity and fewer moving parts of a traditional direct impingement system.
- ❌ Your primary use case is close-quarters defense where a shorter barrel might be more advantageous (consider our SBRs or AR pistols).
How does the P308 compare to other .308 rifles?
| Feature | P308 308 Win. Gas Piston Gen 4 Rifle | Budget DI .308 AR (e.g., PSA PA10) | Premium Gas Piston .308 (e.g., POF-USA P308) |
|---|---|---|---|
| Material | Forged Aluminum Receivers, Steel Barrel | Forged Aluminum Receivers, Steel Barrel | Billet Aluminum Receivers, Nitrided Barrel |
| Quality | Good, solid construction for the price point. | Entry-level, functional, can be hit or miss. | High, precision machined, often includes enhanced components. |
| Compatibility | DPMS pattern .308 magazines, standard AR accessories. | DPMS pattern .308 magazines, standard AR accessories. | DPMS pattern .308 magazines, proprietary components for piston system. |
| Shipping | Same-day from Kansas Gunshop. | Varies by vendor. | Varies by vendor. |
| Lifespan/Durability | Expected long service life with proper maintenance. Gas piston reduces fouling. | Good for the price, but direct impingement may require more frequent cleaning for peak performance. | Excellent, designed for hard use and longevity. |
| Price | $299.00 | ~$800 – $1200 | ~$2000 – $3000+ |
Frequently Asked Questions about the P308 308 Win. Gas Piston Gen 4 Rifle
What is a gas piston system and why is it beneficial?
A gas piston system uses a rod to cycle the bolt carrier group, rather than directing hot, dirty gas directly into the receiver like a direct impingement (DI) system. This results in a cleaner operating rifle, as combustion byproducts are expelled at the gas block. Benefits include reduced fouling, cooler operating temperatures, and potentially increased reliability, especially in adverse conditions.
What kind of accuracy can I expect from this P308 308 Win. gas piston Gen 4 rifle with 20 inch barrel?
Accuracy can vary based on ammunition, shooter skill, and environmental factors. Generally, a well-built .308 AR platform with a 20-inch barrel should be capable of 1.5-2 MOA (Minute of Angle) with quality match-grade ammunition. With practice and optimal conditions, better groups are achievable.
Is the P308 308 Win. Gas Piston Gen 4 Rifle legal in all states?
Firearms laws vary significantly by state and local jurisdiction. While this rifle is generally legal in Kansas, it’s crucial to verify your local and state laws regarding semi-automatic rifles, particularly those with certain features like detachable magazines and pistol grips, before purchasing. As an FFL, we can only ship to states where the firearm is legal for transfer.
What type of magazines does this rifle accept?
This P308 308 Win. gas piston Gen 4 rifle with 20 inch barrel is designed to accept standard DPMS pattern .308 AR magazines. These are widely available from various manufacturers in different capacities.
Can I hunt with a .308 Winchester rifle in Kansas?
Yes, the .308 Winchester is a popular and effective cartridge for hunting various game in Kansas, including deer and hogs. It provides sufficient energy and range for ethical harvests. Always consult the current Kansas Department of Wildlife, Parks and Tourism (KDWPT) regulations for specific hunting seasons, bag limits, and legal methods.
Where can I buy rifles online?
You can buy a variety of rifles online right here at Kansas Gunshop (kansas-gunshop.com). We offer a selection of firearms, and as an FFL holder, we facilitate compliant transfers to your local FFL dealer.
What maintenance is required for a gas piston rifle?
While gas piston systems run cleaner, they still require regular cleaning and lubrication. Focus on the piston system components (piston, operating rod, gas plug) and ensure the bolt carrier group is properly lubricated. The receiver generally stays cleaner, reducing the need for extensive scrubbing compared to a DI system.
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