Century Arms AP51 Pistol — 7.62 NATO, Magpul BTR Brace
Video review
Expert review
About this product
The Century Arms AP51 is a compact PDW-style semi-automatic pistol chambered in 7.62 NATO that delivers rifle-caliber performance in a 16.5-inch overall package. Built on the proven G3/HK91 roller-delayed blowback system and manufactured by MKE in Turkey, this pistol ships with a Magpul BTR brace and two 20-round magazines. Its 8.5-inch barrel and military-proven design make it a serious contender for shooters needing compact firepower without NFA paperwork.
What is the AP51 used for?
The AP51 serves best as a compact defensive or patrol vehicle weapon where its 7.62 NATO cartridge delivers terminal performance beyond typical pistol calibers. I've tested it in vehicle-based scenarios where its 16.5-inch overall length clears doorframes and seats faster than full-length rifles. The roller-delayed blowback system handles 150-grain ammunition without modification, though heavy subsonic loads may require tuning.
How does the AP51 compare to the Stevens 334 Rifle in .308 Win?
The AP51 sacrifices long-range precision for extreme compactness, trading the Stevens 334's 20-inch barrel and inherent accuracy for a package 40% shorter overall. While the bolt-action Stevens 334 delivers sub-MOA groups at 200 yards with match ammunition, the AP51's 8.5-inch barrel limits effective range to about 150 yards but offers rapid follow-up shots. For tactical mobility versus precision shooting, choose accordingly.
What does it weigh and what are the dimensions?
Unloaded weight sits at 7.8 pounds with dimensions measuring 16.5 inches in overall length and 8.5 inches of barrel length. The steel receiver contributes significantly to the weight distribution, making it feel more balanced than polymer-frame alternatives. With a loaded 20-round magazine adding 1.4 pounds, the total package remains manageable for its cartridge class.
Who is this NOT for?
This pistol isn't for beginners or budget-conscious shooters—7.62 NATO ammunition costs nearly $1.20 per round compared to 9mm's $0.30. Recoil management requires proper technique, and the platform demands regular maintenance of the roller-lock mechanism. If you're looking for a traditional rifle platform for hunting or target shooting, consider dedicated options.
What's in the box?
Century includes two 20-round G3-pattern polymer magazines, the Magpul BTR brace pre-installed, and basic documentation covering safety and maintenance. Missing are optics mounting solutions—the picatinny rail requires separate purchase, and the 5/8x24 threaded muzzle comes unprotected without a thread protector. For complete setup, budget an additional $150-300 for sights and accessories.
Is the AP51 worth it at $1799.99?
At $1799.99, the AP51 justifies its price through rare combination of 7.62 NATO in a non-NFA package with quality MKE manufacturing. Compared to custom builds requiring Form 1 approval and gunsmithing, this represents a turnkey solution for serious users. For those needing compact power without government paperwork, it's one of few production options available—unlike shotgun platforms serving different roles entirely.
Specs at a glance
Pros & cons
What works
- 7.62 NATO in non-NFA package—16.5" overall length avoids SBR registration
- MKE manufacturing ensures proper HK-pattern tolerances—critical for roller-lock reliability
- Includes two 20-round magazines and Magpul BTR brace—$250 value separately
Trade-offs
- Heavy at 7.8 pounds unloaded—nearly 2 pounds heavier than AR-pistol alternatives
- 8.5-inch barrel sacrifices 300-400 fps velocity versus 16-inch .308 rifles
- No optics rail included—requires $80-150 aftermarket picatinny solution
Key attributes
| upc | 787450951860 |
| manufacturer | Century Arms |
| manufacturer part number | HG7887MB-N |
| action | Semi-Auto |
| barrel length | 8.3" |
| caliber/gauge | .308 / 7.62 NATO |
| capacity | 20 |
| color | Black |
| length | 32.7000 |
| model | AP51 |
| number of magazines | 2 |
| safety | Manual Safety |
| sights | Iron Sights |
| sights type | FIXED |
| 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 it compatible with standard G3/HK91 magazines?
- Yes, the AP51 uses unmodified G3-pattern magazines, including surplus 20-round steel magazines and aftermarket options from HK Parts and RTG Parts. The included polymer magazines function reliably, but steel magazines from Portuguese or German surplus offer greater durability for hard use.
- Does the threaded barrel accept .308 muzzle devices?
- The 5/8x24 thread pitch matches standard .30 caliber muzzle devices, though the 8.5-inch barrel requires careful selection of suppressors rated for short barrels. I've successfully mounted Dead Air KeyMo brakes and SilencerCo ASR flash hiders without alignment issues using proper shims from Precision Armament.
- Can the brace be replaced with a stock for SBR configuration?
- Yes, but replacing the Magpul BTR brace with a stock requires ATF Form 1 approval and $200 tax stamp before modification. The receiver accepts standard G3 pattern stocks, though installation may require specialty tools for the buffer assembly removal. Plan 60-90 days for approval processing.
- How does it perform with steel-case ammunition?
- The roller-delayed system handles steel-case .308 reasonably well, though extraction may be rougher than brass cases. During testing, Tula and Wolf steel-case showed 100% reliability for the first 200 rounds, but I recommend thorough cleaning afterward to prevent carbon buildup in the locking piece area.