I have one .22LR conversion kit for the HK4 pistol. It includes the barrel/spring, one mag with extended floor plate and one .22LR extractor. $185 shipped.
I accept discreet paypal (no charge if money sent via "gift" option, otherwise +3.5%) or usps money order. If paying by mo please have the payment to me within 5 days of purchasing the item. Items will be shipped promptly with tracking numbers. Thanks for looking.