Description
There's something special about a roller-delayed gun in .308, and the Century Arms AP51 delivers it in a package you can fit in a range bag. Patterned after the famed HK51 PDW and built by MKE, the same Turkish military manufacturer behind the wildly popular AP5 series, this large-format pistol runs a true roller-lock delayed blowback action. That's the same operating system that's earned respect around the world for over fifty years, and MKE tests these guns to NATO environmental standards for salt fog, humidity, extreme heat and cold, sand, and dust. This is not a range toy built to look the part. It's built the old-school way, with a stamped steel receiver and manganese phosphate finish.
What Makes the AP51 Different
The heart of the AP51 is its 8.3-inch cold hammer forged, chrome-lined barrel with a 1-in-12 twist, threaded 5/8×24 and capped with a classic birdcage flash hider. At 23.3 inches overall, you get genuine 7.62×51 NATO punch out of a platform shorter than most carbines with the handguard removed. The Navy-style polymer grip housing gives you an ambidextrous selector, the paddle magazine release will feel right at home if you've spent time behind an HK-pattern gun, and the wide MP5-style handguard fills the hand nicely. Sights are a fixed front post paired with a fully adjustable rear diopter, and the included claw-mount 1913 Picatinny rail means mounting a red dot or LPVO is simple.
Century AP51: Ready to Run Out of the Box
Century sets this one up right. You get two 20-round G3-pattern polymer magazines, a sling, a cleaning kit, and a hard case, so the only stop between your FFL and the range is the ammo counter. Mags are cheap and plentiful thanks to decades of G3 surplus, which keeps feeding this thing affordable. At 7.9 pounds unloaded, the AP51 has enough heft to soak up recoil from the .30 caliber chambering, and the roller-delayed system smooths things out further. Whether you're a roller-lock collector, an AP5 owner looking to step up in power, or you just want a hard-hitting PDW-style pistol with real pedigree, the AP51 is a seriously fun way to burn through some 7.62.
Key Specifications
- Manufacturer: Century Arms (made by MKE)
- Model: AP51
- MPN: HG7887N
- UPC: 787450933477
- Caliber: 7.62×51 NATO / .308 Win
- Action: Semi-Auto, Roller-Lock Delayed Blowback
- Capacity: 20+1
- Barrel Length: 8.3" Cold Hammer Forged, Chrome-Lined
- Twist Rate: 1:12
- Muzzle Thread: 5/8×24 with Birdcage Flash Hider
- Overall Length: 23.3"
- Weight (Unloaded): 7.9 lbs
- Sights: Fixed Front, Adjustable Rear Diopter
- Optics Mount: Claw-Mount 1913 Picatinny Rail
- Safety: Ambidextrous Selector
- Finish: Black Manganese Phosphate
What’s Included
- Century Arms AP51 pistol
- Two 20-round G3-pattern magazines
- Claw-mount 1913 Picatinny optics rail
- Sling
- Cleaning kit
- Hard case
Frequently Asked Questions
Who makes the Century Arms AP51 and what is it based on?
The AP51 is manufactured by MKE in Turkey and imported by Century Arms, the same combo behind the popular AP5 series. It's patterned after the HK51 PDW, essentially a heavily shortened HK-pattern .308 running the classic roller-lock delayed blowback action. MKE tests these to NATO environmental standards for salt fog, humidity, temperature extremes, sand, and dust.
What magazines does the AP51 use?
It feeds from standard G3-pattern magazines and ships with two 20-round polymer mags in the box. G3 mags are among the most affordable and widely available surplus magazines out there, so keeping a healthy stash on hand won't break the bank.
Can I mount an optic or a suppressor on the AP51?
Yes to both. It comes with a claw-mount 1913 Picatinny rail for red dots, scopes, or other optics, and the 8.3-inch barrel is threaded 5/8×24 with a removable birdcage flash hider. That thread pitch is the common standard for .30 caliber suppressors and muzzle devices.
How does 7.62×51 handle out of an 8.3-inch barrel?
The muzzle blast is lively, no way around that with a short-barreled .308, but the 7.9-pound weight and the roller-delayed action do a solid job of keeping recoil manageable. The cold hammer forged, chrome-lined barrel with a 1:12 twist stabilizes common bullet weights well and holds up to high round counts. Most folks find it a blast to shoot in the best sense of the word.




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