Custom Gun Work - LTT RDO Cut for HK USP

IMPORTANT! DOWNLOAD CUSTOM GUN WORK FOR HERE:

USP & HK45 CGW FORM

LTT's Low RDO Solution for your HK USP. Custom Work includes:

• Slide Milling, and prep for our proprietary RDO plate
• Cerakote on the Slide in Elite Black
• Our proprietary Optic Plate (See Footprint Options Below)
• Red Dot height BUIS front sight that matches the adaptor place built in rear sight (lower 1/3rd cowitness)
• Return shipping to the same address that slide was shipped from. 

**An Optic sight is NOT included in this package - Add one here: Holosun Optics**

As of April 2025, we now offer black nitride refinishing on RDO cut HK Slides *ONLY*

Please confirm your optic's footprint PRIOR to placing your order, as we cannot accept ANY returns on RDO plates. Note: Our plates will not work in conjunction with ANY other adapter plates.

To send your slide in for the LTT RDO Cut for the HK USP & HK 45 series Slides, please follow these steps: 

1. Add this item to your cart and check out like any other product. 
2. Fill out the Custom Gun Work Order Form and include your order number (five digit number you receive at checkout). 
3. Pack your slide for shipping and include the filled out CGW form. Your slide MUST BE CLEANED or you will be charged a $15 cleaning fee. 
4. Ship the slide (signature required) & documents to the address provided on the CGW form.
5. LTT will notify you when we are returning the slide - Please be sure to keep an eye on your tracking number for delivery to and from LTT. The shipping fee is for RETURN of the slide to you.

Please allow 4-8 weeks for all work to be performed from time of receipt.  If you want to verify that it arrives to LTT, please ship signature required to the address on the order form and follow your Tracking Number.  Return Shipping is a fixed rate will be charged when you place your order. You are responsible for inbound shipping and following all processes listed on the Custom Gunwork Order Form.

What red dot optics are supported by the LTT RDO Solution?

Our RMR Plate fits:

• Trijicon RMR
• Trijicon SRO
• Trijicon RMR HD
• Holosun HS407C
• Holosun HS507C
• Holosun HS508T
• Riton X3 Tactix PRD
• NcStar VISM FlipDot Pro
• Swampfox Kingslayer
• DOES NOT FIT RMRcc
• DOES NOT FIT RCR (Trijicon's proprietary capstan screws will not work with our t-nut inserts)

• RMR to Plate Screws: Holosun to the RDO Plate use:  4x40 – 5/16 and the RMR or SRO to the RDO Plate use: 4x40 – 3/8

Our HE509T Plate fits:

• Holosun HE509T 

Our Holosun EPS Plate fits:

• Holosun EPS
• Holosun EPS Carry
• Holosun 407k
• Holosun 507k
• Note: If you order this plate for your existing LTT RDO slide, you will also need the corresponding correct front sight (included with the plate). The EPS Plate uses a much lower BUIS rear sight and will not work correctly without this shorter front sight. 
• EPS Optic to Plate Screws: 4x40 - 5/16

WHAT IS THE LTT REAR SIGHT FORWARD (RSF) OPTIC PLATE?

LTT is proud to offer a limited selection of our optics footprints in a rear sight forward (RSF) configuration. Having the rear sight in front of the optic window decreases visual clutter, making it easier to remain focused on the target during the shooting process. Placing the rear sight forward of the optic also means that you can see the dot in 100% of the window, because none of your view of the optic is obstructed by the rear sight. Finally, the RSF configuration can help keep the front lens of your optic clean by deflecting some of the carbon, gas, and debris that exits the chamber away from the lens.

The following footprints are available in a rear sight forward configuration:

1. ACRO
2. RMR
3. 509T
4. EPS

Q: What red dot optics work with the Rear Sight Forward RDO plates?

Our ACRO Plate fits:

• Aimpoint ACRO P1
• Aimpoint ACRO P2
• Steiner MPS

WE HAVE NOT CONFIRMED FITMENT WITH ANY OTHER ACRO-FOOTPRINT OPTICS. 

Our RMR Plate fits:

• Trijicon RMR
• Holosun HS407C
• Holosun HS507C
• Holosun HS508T
• Holosun 507 Comp
• Riton X3 Tactix PRD
• Swampfox Kingslayer

DOES NOT FIT:

• Trijicon SRO
• Trijicon RMR HD
• RMRcc
• Trijicon RCR (Trijicon's proprietary capstan screws will not work with our t-nut inserts)

RMR to Plate Screws: Holosun to the RDO Plate use:  4x40 – 5/16 and the RMR or SRO to the RDO Plate use: 4x40 – ⅜

Our HE509T Plate fits:

• Holosun HE509T 

Our Holosun EPS Plate fits:

• Holosun EPS
• Holosun EPS Carry
• Holosun 407k
• Holosun 507k
• Note: If you order this plate for your existing LTT RDO slide, you will also need the corresponding correct front sight (included with the plate). The EPS Plate uses a much lower BUIS rear sight and will not work correctly without this shorter front sight. 

EPS Optic to Plate Screws: 4x40 - 5/16

Important Note Regarding RDO Plate Compatibility: This is not a comprehensive list of all the optics that may work with our plates. Our plates have been designed to fit tightly with the optic body of the main optic it was designed for. Other optics manufacturers may use the same footprint for mounting but have a different size optic body or may change the size of their optic body without warning. We cannot guarantee fit with all manufacturers that use these listed footprints.

Looking for replacement screws? You can find them here.

Order Form

NOTE: HK USP Models with adjustable, factory installed rear sights cannot be cut for LTT's LOW RDO due to the geometry & depth of the adjustable sight slide cut. Please see the last photo on this page if you are unsure if your USP has factory adjustable rear sights.

Potentially affected pistols are the HK USP Elite, Expert, Tactical, & Compact models. 

LTT cannot accept or work on firearms that have already received third party customization or gunsmithing to the integral parts of the firearm’s action.

This includes but is not limited to the trigger and fire control mechanism, the barrel, firing pin, or any safety components, or slides previously cut for red dot by another vendor. If you are unsure about the status of your firearm, please call us to confirm.