HK MP5K Custom Build Complete 9mm

From: Original price was: $3,49900.Current price is: $3,19900.

SKU: MP5KSEF-1 Categories: , Tags: , , Product ID: 9867

Available for immediate shipping

This is an MP5K, 9mm parts kit build in semi-auto (like the SP5K), using original HK parts, RCM barrel, RCM bolt carrier and the LSC/PTR receiver flat kit. The build was done by Black Ops Defense to our highest quality standard!

The demilled MP5 machinegun parts were refurbished and reused to build this semi-auto version of the HK MP5K. ( Similar to the HK SP5K/SP89 )

Shown in possible SBR or pistol configurations. ( stock not included )

New Jersey and California compliant configurations also available! Contact us for more info.


Some images show possible configurations with and without custom engraving, accessories, etc… ( optics and other unmentioned accessories not included )

(See below for additional information)

Product Quantity

Additional Service: NFA/SBR Engraving


Shipping Case Options


Optional Shipping Insurance

Set value package insurance, if you'd like to add it. This is optional. All packages will ship with tracking and signature confirmation regardless.


In stock



  • HK MP5K parts kit (demilled machine gun)
  • HK MP5K factory bolt group ( RCM carrier – “sear ready” )
  • HK MP5K “SEF” factory lower housing and trigger group, semi-auto converted
  • RCM MP5K 3 lug and threaded ( 1/2 x 28 ) barrel
  • US made foregrip, cocking tube, etc…
  • Pistol cap or buttstock options available
  • KCI 30rnd magazine


  • 9mm
  • Sear Ready
  • Fully refurbished/rebuilt in house by Black Ops Defense
  • NFA engraving for form 1, SBR/AOW tax stamp options available
  • Pistol or SBR options
  • For NJ and CA compliant configurations, contact us


Additional Instructions:

  • Please have your dealer E-MAIL a photo or scan of their FFL for the transfer.
  • If you are sending your receiver back for markings after transfer, please E-MAIL a photo or a scan of your ID for our records. Contact us if your shipping address is different than your ID to confirm.
  • Indicate your return shipping address in the "shipping address" section during checkout, and include your dealer's address and FFL in the "dealer section", if available.
  • All firearms will ship with signature confirmation ( insurance is extra, see work order options )
  • Shipping fee overcharges will be refunded once we know your actual shipping cost, if applicable.
  • Add NFA engraving info, date codes, or other project details to the "notes" section during checkout (on the credit card processing and check out page).

Additional information

Weight 175 oz
Dimensions 36 × 12 × 6 in


Shipping Case Options

Choose One

Customer Supplied Shipping Case, Tactical Soft Case, Plano Case & Accessories, Eylar Case & Accessories, Pelican Case & Accessories

Optional Shipping Insurance

Shipping Insurance

No Insurance, 1000$ Insurance, 2000$ Insurance, 3000$ Insurance, 4000$ Insurance, 5000$ Insurance

Sign Up to our Email Newsletter

Sign Up to our Email Newsletter

BLACK OPS DEFENSE © 2023. All rights reserved.

BLACK OPS DEFENSE © 2023. All rights reserved.

Minimum 4 characters