Century Arms AP5-SD 9mm Pistol — 5.75in Threaded Barrel
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Expert review
About this product
The Century Arms AP5-SD is a semi-automatic 9mm pistol built on the MP5 platform with a 5.75-inch threaded barrel optimized for suppressor use, combining roller-delayed blowback reliability with modern accessory compatibility.
What is the Century Arms AP5-SD used for?
The AP5-SD serves primarily as a suppressor-ready range and training pistol that bridges the gap between handgun maneuverability and SMG-like performance. With its 5.75-inch barrel and 3-lug mount, it delivers superior suppression performance compared to typical handguns while maintaining the compact form factor that makes it ideal for vehicle operations or home defense scenarios where full-sized firearms would be cumbersome. The 1913 Picatinny rail allows for optic mounting, enhancing its utility for tactical drills or night vision-equipped training.
How does the Century Arms AP5-SD compare to the Stevens 334 Rifle?
The AP5-SD outperforms the Stevens 334 Rifle in close-quarters applications but lacks its long-range precision capability. Where the Stevens 334's .308 Winchester chambering delivers effective energy beyond 300 yards, the AP5-SD's 9mm cartridge is optimized for engagements under 100 yards, making the Stevens superior for hunting or precision shooting while the AP5-SD excels in rapid, close-range scenarios. The AP5-SD's semi-automatic operation and 30-round magazine capacity provide significantly faster follow-up shots than the bolt-action Stevens platform.
What does it weigh and what are the dimensions?
The AP5-SD weighs 105.82 ounces (approximately 6.6 pounds) with an overall length of 15.7 inches when configured without the faux suppressor. The 5.75-inch cold hammer-forged barrel provides optimal ballistics for 9mm while keeping the package compact enough for storage in vehicle racks or tactical bags. The stamped steel receiver contributes significantly to the weight distribution, creating a balanced feel that helps control muzzle rise during rapid fire.
Who is this NOT for?
This pistol is not ideal for first-time firearm owners or those primarily interested in traditional handgun carry. The AP5-SD's 6.6-pound weight and 15.7-inch length make it unsuitable for concealed carry, and its NFA-compliant configuration requires additional paperwork and waiting periods for suppressor attachment that casual shooters may find burdensome. For traditional shotgun users looking for something simpler, the Stevens 555 Sporting O/U offers straightforward operation without regulatory complications.
What's in the box?
The package includes the AP5-SD pistol, two 30-round steel magazines, and a removable faux suppressor that maintains the iconic MP5-SD profile while awaiting ATF approval for actual suppressor use. All essential documentation and a basic cleaning kit are included, though serious users will want to upgrade to specialized MP5 platform maintenance tools for proper roller-delayed system care. The magazines feature anti-tilt followers and are compatible with most HK-pattern aftermarket options.
Is the Century Arms AP5-SD worth it at $1599.99?
At $1599.99, the AP5-SD represents solid value for shooters specifically seeking authentic MP5 platform performance without the $3000+ price tag of German-made alternatives. The cold hammer-forged barrel and proper roller-delayed blowback system deliver reliability that justifies the premium over direct blowback clones, while the suppressor-ready configuration saves approximately $200-300 in aftermarket modification costs. For enthusiasts wanting the closest legal approximation to the iconic MP5-SD without Form 4 wait times, this price point hits the sweet spot between authenticity and accessibility.
Specs at a glance
Pros & cons
What works
- Weighs 105.82 oz with balanced weight distribution for controllable rapid fire
- Includes two 30-round magazines - $120 value compared to aftermarket HK mags
- 5.75-inch cold hammer-forged barrel delivers 1250 FPS with 115gr ammunition
- 3-lug muzzle system allows instant suppressor mounting without threading concerns
Trade-offs
- Requires ATF Form 1 approval and $200 tax stamp for SBR conversion
- Faux suppressor adds 4.3 inches to overall length without functional benefit
- Stamped steel construction shows wear more quickly than machined alternatives
- No iron sights included - requires $150-300 optic investment for practical use
Key attributes
| upc | 787450933491 |
| manufacturer | Century Arms |
| manufacturer part number | HG7886-N |
| action | Semi-Auto |
| atf type | Pistol |
| barrel length | 5.75" |
| caliber/gauge | 9mm |
| capacity | 30 + 1 |
| color | Black |
| length | 32.8000 |
| model | AP5-SD |
| number of magazines | 2 30 rd. |
| package height | 3.75 |
| package width | 11.0 |
| product type | Semi-Auto Pistol |
| safety | Manual Safety |
| shipping weight | 12.3 |
| sights | Rear Diopter |
| sights type | Adjustable Sights |
| state restriction (il) | NO SALE TO ILLINOIS PICA |
| state restriction (ri) | NO DIRECT SHIP TO RHODE ISLAND |
| state restriction (wa) | NO DIRECT SHIP TO WASHINGTON |
Frequently asked questions
- Is the AP5-SD compatible with standard HK MP5 accessories?
- Yes, the AP5-SD maintains full compatibility with HK-pattern MP5 accessories including magazines, handguards, and stocks. The 1913 Picatinny rail accepts most modern optics, and the 3-lug muzzle accepts standard HK-style suppressor mounts. Century Arms guarantees fitment with all HK-spec components.
- Does this require an ATF Form 1 to convert to an SBR?
- Yes, attaching a stock requires filing ATF Form 1 and paying the $200 tax stamp before modification. The pistol ships with a rear cap designed for easy stock attachment once approved. The approval process typically takes 30-90 days through the ATF's eForms system.
- How long is the barrel threaded section?
- The 1/2x28 RH threaded portion measures 0.6 inches in length, providing sufficient engagement for most suppressors while maintaining the 3-lug functionality. The threads are cut to SAE specifications for consistent suppressor alignment and timing.
- Can I use 147 grain subsonic ammunition effectively?
- Absolutely, the 5.75-inch barrel and roller-delayed system are optimized for 147 grain subsonic loads, maintaining reliable cycling while keeping velocities below the 1125 FPS threshold for optimal suppression. We recommend testing with Federal 147gr FMJ for baseline function checking.
- What is the warranty period?
- Century Arms provides a 1-year limited warranty covering manufacturing defects, with an optional 2-year extension available for $99. Their customer service responds to warranty claims within 3-5 business days according to their published service standards.