The H&K SP5/SP5K Handgun Magazine – Black, 9mm Luger, 10-Round (Model 239257S, UPC 642230255210) is a factory-original Heckler & Koch steel magazine engineered for flawless performance in your SP5, SP5K, and compatible MP5-pattern pistols. With a compact 10-round capacity, durable all-steel body, and sleek black finish, this OEM mag is ideal for range use, training, and capacity-restricted states where 10-round limits apply. EuroOptic+3OpticsPlanet+3Buds Gun Shop+3
Genuine HK Factory Magazine for SP5 & SP5K
This isn’t a generic aftermarket mag—it’s an original HK factory magazine, built to the same exacting standards as the firearm itself:
If you run an SP5 or SP5K as a PDW, PCC, or range gun, these mags are the gold standard for reliability and fit.
Rugged All-Steel Construction with Black Finish
HK designed this magazine to withstand hard use, just like its iconic roller-delayed blowback guns:
Body Material: All-steel construction for maximum strength and long-term durability. TLO Outdoors+2EuroOptic+2
Finish: Durable black finish that resists corrosion and wear while matching the look of your SP5/SP5K. Classic Firearms+2Buds Gun Shop+2
Follower & Spring: Precision HK design for consistent feeding and reliable last-round lock-back (where applicable). interstateguns.com
Many shooters specifically prefer OEM HK mags for serious use because the tolerances, materials, and finish are built to duty standards—not just range-only use. interstateguns.com+1
Compact 10-Round Magazine – Great for Benches & Restricted States
The 10-round capacity brings some real advantages beyond legal compliance:
Shorter length makes it easier to shoot off a rest, bipod, or bench without the mag contacting the surface. Buds Gun Shop+1
Perfect for indoor ranges or training environments that limit capacity or prefer smaller mags.
Compliant option for many state and local magazine restrictions, offering an HK-made solution instead of third-party limited mags. Guns.com+2Scheels+2
Whether you’re building a compliant SP5/SP5K setup or want dedicated “bench mags” that stay out of the way, this 10-round mag is a smart addition.
Smooth, Reliable Feeding for 9mm Luger
Reliability is where HK factory magazines shine:
If your SP5/SP5K is a defensive gun or “serious use” firearm, running genuine HK mags reduces one of the biggest potential failure points.
Ideal as a Replacement, Spare, or Dedicated Training Mag
Because magazines are consumable parts, smart shooters keep extras on hand:
Use as a factory replacement if your original mag is worn or damaged. Palmetto State Armory+2Impact Guns+2
Stock up as spares for classes, range days, or competition.
Keep a set of 10-round mags for zeroing optics and off-the-bench accuracy work, where shorter mags are more convenient.
Many retailers specifically recommend grabbing multiple mags at once to ensure you have enough for drills, malfunction practice, and staged gear. Classic Firearms+2BOSQUE Outdoors+2
Key Features – H&K SP5/SP5K 9mm 10-Round Magazine 239257S
From HK and major distributors: Scheels+4OpticsPlanet+4Buds Gun Shop+4
Brand: Heckler & Koch (HK)
Model / Part Number: 239257S
UPC: 642230255210
Product Type: Detachable pistol magazine
Gun Make: Heckler & Koch
Gun Model: SP5, SP5K (also compatible with many MP5-style 9mm platforms)
Caliber: 9mm Luger
Capacity: 10 rounds
Construction: All-steel body
Finish: Black
Origin: Factory OEM HK magazine
Compliance & Shipping Notes
Because this is a 10-round magazine, it is often approved in states with magazine capacity restrictions; however, some jurisdictions still impose additional limitations. Retailers frequently list shipment restrictions and may not ship to certain locations depending on current law. Buds Gun Shop+2Guns.com+2
Always check your local and state regulations before purchasing or possessing magazines—especially if you travel with your SP5/SP5K.
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Pair this long-form description with clear product photos and a concise spec table, and customers will immediately see why this H&K SP5/SP5K 9mm 10-Round Magazine (239257S) is the right choice for their HK pistol.
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