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How To Order Build Kits

Starting Immediately, We will no longer Sell 80% Frames with our Build Kits. 80% Frames will need to be added separately. We've discounted our Build Kits - No Frame plus 80% Frames so that the price reflects our most current pricing. Add the each items (slide with or without lpk plus the frame) to the cart to see the discount. 

Direct Link for the Corresponding Frames is located on each Product Description. 

Polymer80/Strike80 80% Frames Will Come with the following items

  • 80% Frame
  • Front and Rear Locking Blocks
  • Pins
  • Springs (if applicable)
  • Drill Bits
  • End Mills are no longer provided by P80

*You will no longer need to purchase the "Jig Kit"

When purchasing any of our Build Kits - No Frame items, please be aware of your selections. Non Selectable Items (Gray items) means the item is out of stock. Pricing will be automatically adjusted of any out of stock items

URGENT Notice:
If you have any issue with POLYMER80 80% Pistol Frames and its parts ie locking blocks, pins, jigs and drill bit. Please contact polymer80 support for Warranty/RMA. Dealers do not have spare parts allocated to us so per P80, go directly thru them.

P80 Support Contact:

If you have any issue with Strike Industries Compact 80% Pistol Frames and its parts ie locking blocks, pins, jigs and drill bit. Please contact Strike Ind. support for Warranty/RMA. Do not contact P80, they will just send you back to Strike Ind.

Strike Ind. Support Contact:

About Builders Kit:

These are called BUILDERS Kits and not called “Assemble Kit” for a reason. You will need to file/sand/polish p80 frames/parts in order to make it work. Esp. for the subcompact, almost 100% of the time you will have to modify the locking block. If you are not capable of doing this then DO not buy these kits. It is your SOLE responsibility to figure out how to install any of the parts you've purchased from us. We can't tell you how to fix a non-resetting trigger, or how to install a slide parts kit. Please do your own due diligence and Search online prior to purchasing any of the builders kits. We will not assemble any slide parts kits at this time. All our build kits will have Channel Liners already installed. If we have time, then we will also install sights (if they're available). You can figure out the rest. Simple google search usually does the job. Again, if you’re not capable of doing this then DO not purchase any of these build kits. We STRONGLY RECOMMEND to go on and searching  "marinegunbuilder". Watch all of his build kit related videos. It will help you understand what to look for when you're building your kit.

To make a purchase from MDX ARMS, you certify the following is true:

  • You are a permanent resident or US citizen, nor have you renounced your citizenship.
  • You have never been convicted of a felony.
  • You have never been convicted of a crime punishable by more than one year in prison.
  • You have never been convicted of a domestic violence crime misdemeanor.
  • You have never been committed to a mental institution or adjudicated as mentally defective.
  • You are not currently under a court order restraining you from stalking, threatening, or harassing a child or an intimate partner.