HK Three Position Buttstock – Black Rubber/Steel/Polymer – Fits HK SP5 Pistol/Rifle – 227901
Manufacturer: Heckler & Koch • Model/MPN: 227901 • UPC: 642230253728 • Color: Black • Material: Rubber / Steel / Polymer • Fit: HK SP5 & MP5 platforms
Upgrade your SP5 or MP5 with the HK Three Position Buttstock Black Rubber/Steel/Polymer Fits HK SP5 Pistol/Rifle 227901 642230253728. This factory Heckler & Koch 3-position retractable buttstock delivers the classic MP5 look and feel with modern improvements, giving you fast length-of-pull adjustment, enhanced recoil control, and a compact profile for storage and transport. Built with a rugged steel rail assembly, durable polymer housing, and a comfortable rubber buttpad, it’s a premium OEM solution for turning your HK SP5 pistol into a proper carbine (where legal) or refreshing an older MP5 pattern rifle.
Note: All NFA rules apply. Always comply with federal, state, and local laws before installing a buttstock on a pistol.
Genuine HK 3-Position Retractable Stock
This is not an aftermarket clone—it’s a genuine Heckler & Koch SP5/MP5 3-Position Retractable Buttstock, factory spec and built to HK’s exacting standards:
Designed specifically for HK SP5 pistol/rifle platforms and MP5/MP5SD variants.
Compatible with HK roller-delayed firearms chambered in 9mm, 10mm, and .40 S&W using the standard MP5-style rear interface.
Ideal as a factory-correct upgrade or replacement for worn or surplus stocks on MP5 clones and SP5 builds.
If you want the authentic HK retractable stock experience, this OEM unit is the benchmark.
Three Locking Positions for Custom Length of Pull
The standout feature is the three-position retractable design, allowing you to tailor the stock to your body, gear, and shooting style:
Fully collapsed position for the most compact footprint—great for storage, transport, or working in tight spaces.
Intermediate position for shooters wearing body armor, heavy jackets, or for closer quarters where a shorter length of pull is preferred.
Fully extended position for a traditional rifle-like shoulder mount and optimal sight alignment with iron sights or low-mounted optics.
The positive locking detents provide a secure feel in each position so you can shoulder the gun with confidence shot after shot.
Steel, Polymer & Rubber Construction – Built to HK’s Standards
Heckler & Koch’s 3-position stock is known for its robust construction and long service life:
Steel guide rails and internal hardware deliver excellent strength and rigidity under recoil and heavy use.
High-strength polymer stock body keeps weight in check while resisting impact, solvents, and environmental abuse.
Rubber buttpad helps absorb recoil and provides a non-slip shoulder interface for more stable shooting positions.
This combination of rubber, steel, and polymer is exactly what you’d expect from an HK factory part: rugged, refined, and ready for real use.
Improved Buffer System & Recoil Control
This HK 3-position stock includes an improved internal buffer, designed to work with HK’s roller-delayed blowback system:
Integrated buffer assembly helps smooth out recoil impulse, especially during fast strings of fire.
Reduces felt recoil and muzzle disruption, which can aid in faster follow-up shots and better control in rapid fire.
Ideal for shooters running high volumes of 9mm, or using hotter 10mm or .40 S&W loads on MP5 variants.
Better buffering means your SP5/MP5 will feel smoother and more controllable, especially in dynamic shooting drills.
Compact, Fully Collapsible Design
When you need your firearm to be as compact as possible—for storage or transport—this stock shines:
Fully collapsible design pulls the stock rails into the shortest position, bringing the overall length down significantly.
Makes it easier to stow SP5/MP5 platforms in discreet carry bags, vehicle racks, safes, and cases.
Retracts quickly, with a smooth tracking motion along the twin steel rails, and extends just as easily back into a shooting-ready position.
You get the best of both worlds: compact footprint off the shoulder, full stability on the shoulder.
Optimized for SP5 & MP5 Ergonomics
This HK Three Position Buttstock is tuned specifically around the SP5/MP5 form factor:
Maintains the classic MP5 silhouette, preserving the iconic look while adding modern comfort features.
Proper comb height and buttpad geometry support a natural cheek weld with diopter drum sights or low-mounted optics.
Designed to work seamlessly with the HK receiver rear interface, avoiding fitment headaches common with off-brand stocks.
If you’re building a clone-correct MP5 or upgrading an SP5, this is the stock that preserves the original DNA of the platform.
Ideal Uses – From Range Work to Defensive Setups
The HK 227901 Three Position Buttstock is ideal for:
Home defense and duty SP5/MP5 builds where adjustability and reliability matter.
Training and range carbines that see high round counts and demand a durable, adjustable stock.
PCC competition guns based on MP5/SP5 platforms needing repeatable length-of-pull and solid recoil management.
Collectors and HK purists looking for factory-correct parts to maintain authenticity.
Because it’s genuine HK, it’s equally at home on a hard-use gun or a high-end collector build.
Key Specifications – HK Three Position Buttstock (227901)
From HK and major retailers:
Manufacturer: Heckler & Koch
Product Name: SP5/MP5 3-Position Retractable Buttstock
Model / MPN: 227901
UPC: 642230253728
Color: Black
Construction: Rubber buttpad / steel rails & internal components / polymer stock housing
Positions: 3 locking positions (fully collapsed, intermediate, fully extended)
Overall Length: Approx. 10.5" (fully extended)
Fit:
HK SP5 pistol/rifle configurations
HK MP5 / MP5SD and compatible clones with standard MP5 rear interface
Platforms chambered in 9mm, 10mm, and .40 S&W (per HK/retailer specs)
Features:
Retractable, 3-position adjustable stock
Improved buffer system
Rubber buttpad for comfort and recoil absorption
OEM HK quality and fitment
Always verify compatibility with your specific firearm, and ensure all NFA and local regulations are followed before installing this buttstock on a pistol platform.
SEO-Focused Summary
The HK Three Position Buttstock Black Rubber/Steel/Polymer Fits HK SP5 Pistol/Rifle 227901 642230253728 is a genuine Heckler & Koch SP5/MP5 3-position retractable buttstock that combines steel guide rails, a rugged polymer housing, and a comfortable rubber buttpad with an improved buffer system for smoother recoil control. Fully collapsible with three locking positions, this OEM HK stock delivers compact storage, fast length-of-pull adjustment, and factory-correct fit on SP5 and MP5 platforms in 9mm, 10mm, and .40 S&W—all while preserving the iconic MP5 look and handling.
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