If you have trouble making a transaction, YOU STILL CAN PURCHASE VIA PAYPAL INVOICE OR SEND USPS MONEY ORDER OR please use our paper form located here: Manual CC Form

HDPS CORP – The Home of Quality Heckler and Koch conversions services and parts since 2003, no aftermarket compromise!

ATTENTION – Be aware that HDPS CORP is the only maker of Conversion Blocks (B and C) for the Heckler and Koch USC to UMP conversion. We have received emails with problematic Blocks made and sold by other manufacturer claiming to be a Block B. MAKE SURE IT IS ENGRAVED as you see in photos to avoid fitting problems with counterfeit Block B’s




Quality replacement parts and upgrades for functionality and style


Upgrade your firearm with the latest technology 

Machine Services

Custom modifications for law enforcement and sport professionals

Finish Services

Give your weapons locker a fresh look with classic finishes and patterns


Browse our selection of rifles and carbines


Outfit and personalize your gear.


Dependable reliable shotguns


Replacement parts for your firearms.


Machine and finish services

Send Us A Message

Privacy Policy

    HDPS CORP  respect our clients privacy. When your personal information is received, we use it only to fulfill the transaction or service you have purchased.

- We do not store Credit Card information, this site is SAFE to place your order, we do not directly collect, process or store your debit or credit card information. Online payments made through this website are processed securely by U.S. based third-party payment provider (ELAVON).

- We do not subscribe you to marketing emails without your consent.

- We do not sell or give away your contact information to any other entities.

- We do not allow the Merchant Processor that process transactions for us to sell or give away your information either.

This policy applies to personal information collected on HDPS.ORG

We do not collect cookies or track what you purchase to target you later like most websites! Your privacy is important to us.

 We do collect your IP addresses for security purposes, yours and ours.


Homeland Defense & Police Supply Corp

Our Mission
We specialize in Assault Weapons, Class 3 Firearms and Suppressors for Civilians and will also provide help and logistic for Govt. Agencies and Police Depts.

HDPS CORP Return and Refund Policy

Thanks for shopping online at HDPS CORP. Your business is very important to us, rarely we have a return and when it happens is because buyer purchase wrong item, we’re here to help. We also, of course, stand behind all of our products and will refund/exchange your purchase if you find a problem with your order.


    Please alert us within 3 days of receiving your HDPS CORP product for whatever reason and would like to make a return.
    To start the return process please contact us at defensearms@aol.com to describe your issue.
    Return will be processed once we receive and inspected the returned product at HDPS CORP.


    You will receive a refund for the cost of your purchase including shipping costs if it is our fault. If you change your mind or purchased wrong item you will receive only a refund for  the cost of your purchase, you pay shipping costs both ways.
    Your refund will be credited in the same manner used for payment of the original order unless noted otherwise.
    We will have to charge the Credit Card Fees, Banks will not refund the paid fees for their transaction services.
    There will be a Restocking Fee of 10% when you return a HDPS CORP product for any reason (exclude problem with product)