Let’s Talk About Griffin Armament MK1 PSD 5.56mm 9.5 inch Upper
The Griffin Armament MK1 PSD 5.56mm 9.5 inch Upper is a premium AR-15 upper receiver designed for those prioritizing compactness, maneuverability, and reliability. Crafted by Griffin Armament, known for their high-quality firearm components and suppressors, this upper promises exceptional performance in a small package, ideal for personal defense, law enforcement, or anyone needing a short-barreled rifle (SBR) configuration. The HEDP barrel and rigid rail are notable features.
My search for a compact and reliable upper receiver led me to the Griffin Armament MK1 PSD 5.56mm 9.5 inch Upper. I needed something highly maneuverable for close-quarters training and potentially for use in a vehicle, while still delivering acceptable ballistic performance. I’ve always valued quality components in my firearms, and the Griffin Armament name carries significant weight in the industry.
Upon unboxing, I was immediately impressed by the fit and finish of the upper. The anodizing was flawless, and the components felt solid and well-assembled; it also was lighter than expected, without feeling cheap. The rigid rail provided a very sturdy platform for accessories.
I considered the Daniel Defense MK18 upper and the Bravo Company Manufacturing (BCM) 11.5″ upper before ultimately choosing the Griffin Armament MK1 PSD 5.56mm 9.5 inch Upper. While the MK18 is legendary and the BCM offers excellent value, the Griffin Armament‘s emphasis on suppressor optimization and rigid rail system swayed my decision. I plan on using this upper primarily with a suppressor, so it made sense.
My first impression was excitement tempered with a bit of apprehension. I knew the quality was there, but I was eager to see how the short barrel would perform ballistically and whether it would live up to the hype surrounding its suppressor-friendly design. I was definitely keen to see if it would minimize point of impact (POI) shift when using a suppressor.
Real-World Testing: Putting Griffin Armament MK1 PSD 5.56mm 9.5 inch Upper to the Test
First Use Experience
My first range trip with the Griffin Armament MK1 PSD 5.56mm 9.5 inch Upper was at my local outdoor range, primarily focusing on drills at distances from 25 to 100 yards. The weather was clear and dry, ideal for getting a feel for the upper’s accuracy and handling characteristics. I wanted to put about 500 rounds through it, and see how it functioned.
The upper performed admirably in these conditions. Recoil was manageable, and the muzzle blast, while noticeable, wasn’t excessive compared to other short-barreled AR-15s I’ve used. Function was perfect.
The only adjustment I needed was finding the optimal gas setting on my adjustable gas block (not included with the upper) for suppressed fire. This is expected. After that, it was smooth sailing.
After the first session, I noticed some carbon buildup around the gas block, but it was easily cleaned off. The Griffin Armament rail remained solid, even after mounting and removing accessories multiple times.
Extended Use & Reliability
After several months of regular use, the Griffin Armament MK1 PSD 5.56mm 9.5 inch Upper has proven to be exceptionally reliable and durable. I have put approximately 3,000 rounds through it without any malfunctions. I use a variety of different ammunition types.
Despite frequent use and exposure to varying weather conditions, the upper shows minimal signs of wear and tear. The finish is holding up well, and the barrel continues to deliver consistent accuracy. I inspect it regularly and clean it thoroughly.
Cleaning and maintenance are straightforward, thanks to the high-quality materials and thoughtful design. The nitrided barrel is easy to clean, and the rail system allows for easy access to the gas block and barrel nut. It’s far easier to clean than some of my other uppers.
Compared to previous experiences with other short-barreled AR-15 uppers, the Griffin Armament MK1 PSD 5.56mm 9.5 inch Upper outperforms them in terms of accuracy, reliability, and overall build quality. The minimized POI shift with a suppressor is particularly impressive. I’m able to consistently hit targets at further distances.
Breaking Down the Features of Griffin Armament MK1 PSD 5.56mm 9.5 inch Upper
Specifications
The Griffin Armament MK1 PSD 5.56mm 9.5 inch Upper boasts several impressive specifications:
- Caliber: 5.56x45mm NATO. This ensures compatibility with a wide range of readily available ammunition.
- Barrel Length: 9.5 inches. This offers a significant reduction in overall length, enhancing maneuverability.
- Finish: Matte. This provides a non-reflective surface, reducing visibility in tactical situations.
- Gun Model: AR-15. This guarantees compatibility with standard AR-15 lower receivers.
- Condition: New. This ensures the upper is free from prior use or damage.
- Gun Rail: M-LOK. This allows for versatile attachment of accessories along the rail.
- Magazine Included: No. Magazines must be purchased separately.
- Model: PSD. This designates the specific configuration of the upper receiver.
- Length: 9.5 inches. This confirms the overall length of the barrel.
- HEDP Barrel: High Endurance Dual Purpose functionality offering high durability and precision accuracy.
- TRUE-BORE concentric suppressor grade threads: Provides an optimized thread interface for silencers.
- Griffin Low-Pro RIGID rails: A slim, low profile, ultralight, yet rigid M-LOK rail.
These specifications combine to create a highly capable and versatile upper receiver. It performs great with or without a suppressor.
Performance & Functionality
The Griffin Armament MK1 PSD 5.56mm 9.5 inch Upper excels in its primary role: providing a compact and reliable AR-15 platform. Its short barrel provides excellent maneuverability in tight spaces, while the optimized gas system ensures reliable cycling with a wide range of ammunition. This makes it suitable for both suppressed and unsuppressed use.
A key strength is the minimized POI shift when using a suppressor, a crucial factor for accuracy in suppressed shooting. The Griffin Low-Pro RIGID rails also provides a sturdy platform to mount aiming devices. The only notable weakness is that short-barreled rifles inherently suffer from reduced ballistic performance compared to longer barrels.
Overall, the upper meets and even exceeds expectations. It provides a great platform for home defense, law enforcement, or recreational shooting.
Design & Ergonomics
The Griffin Armament MK1 PSD 5.56mm 9.5 inch Upper features a well-thought-out design with excellent ergonomics. The materials used are of high quality, contributing to a robust and durable product that should last for years. Despite its compact size, the upper doesn’t feel overly cramped or uncomfortable to use.
The slim profile of the rail system is particularly noteworthy, providing a comfortable grip and enhancing overall handling. The M-LOK slots offer ample attachment points for accessories without adding unnecessary bulk. It’s easy to customize with whatever accessories you require.
The upper is user-friendly, with no significant learning curve. It easily attaches to any standard AR-15 lower receiver. It’s extremely easy to install and utilize.
Durability & Maintenance
The Griffin Armament MK1 PSD 5.56mm 9.5 inch Upper is built to last, thanks to its high-quality materials and meticulous construction. The nitrided barrel is highly resistant to wear and corrosion, ensuring a long service life. The 7075 T6 Aluminum barrel nut should provide worry-free usage.
Maintaining the upper is simple and straightforward. Regular cleaning and lubrication are all that’s needed to keep it running smoothly. The design allows for easy access to all critical components for maintenance. It should last for tens of thousands of rounds, if properly maintained.
Accessories and Customization Options
The Griffin Armament MK1 PSD 5.56mm 9.5 inch Upper is compatible with a wide range of AR-15 accessories. The M-LOK rail system allows for the attachment of various grips, lights, lasers, and other accessories. The end user has total control.
The upper readily accepts any standard AR-15 charging handle, bolt carrier group, and muzzle device. Griffin Armament also offers a variety of their own accessories, such as suppressors and muzzle brakes, that are specifically designed to work with this upper. The possibilities are truly endless.
Pros and Cons of Griffin Armament MK1 PSD 5.56mm 9.5 inch Upper
Pros
- Exceptional build quality. The materials and construction are top-notch.
- Optimized for suppressor use. The minimized POI shift is a major advantage.
- Highly maneuverable. The short barrel makes it ideal for tight spaces.
- Reliable performance. It cycles smoothly with a variety of ammunition.
- Rigid and slim rail system. It provides a comfortable grip and solid mounting platform.
Cons
- Short barrel reduces ballistic performance at longer ranges. This is true of all SBRs.
- Relatively expensive compared to other upper receivers. You get what you pay for, though.
Who Should Buy Griffin Armament MK1 PSD 5.56mm 9.5 inch Upper?
The Griffin Armament MK1 PSD 5.56mm 9.5 inch Upper is perfect for:
- Those prioritizing maneuverability and compactness.
- Individuals who frequently use suppressors.
- Law enforcement professionals needing a CQB weapon.
- Home defense enthusiasts wanting a reliable and easily handled AR-15.
This product is NOT for:
- Shooters primarily focused on long-range accuracy.
- Budget-conscious buyers looking for the cheapest option.
Must-have accessories or modifications include: a high-quality bolt carrier group, a reliable charging handle, and a suppressor (to take full advantage of its optimized design).
Conclusion on Griffin Armament MK1 PSD 5.56mm 9.5 inch Upper
The Griffin Armament MK1 PSD 5.56mm 9.5 inch Upper is a premium AR-15 upper receiver that delivers exceptional performance and reliability in a compact package. While the price is higher than some competitors, the superior build quality, suppressor optimization, and rigid rail system justify the investment. It’s a fantastic offering from Griffin Armament.
If you’re looking for a top-tier short-barreled upper that’s built to last and designed for suppressed shooting, the Griffin Armament MK1 PSD 5.56mm 9.5 inch Upper is an excellent choice. I wholeheartedly recommend it. Now, go get yours and experience the Griffin Armament difference!