Blackfin™ AR15/M16 Stainless Steel Lower Parts Kit, 5.56, Assembler’s Special

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Product Overview

This kit offers high strength, corrosion-resistant components to start your custom build. Add your own fire control group, trigger guard and grip for the ultimate custom built lower.

All Saltwater Arms components are high quality, 100% USA produced and manufactured. Each kit is guaranteed to fit your Mil-Spec dimension lower receiver.

Kit Includes:

  • Stainless Steel Bolt Catch
  • Stainless Steel Bolt Catch Roll Pin
  • Stainless Steel Bolt Catch Detent
  • Stainless Steel Safety Selector
  • Stainless Steel Selector Detent
  • Stainless Steel Magazine Catch Assembly
  • Stainless Steel Fire Control Group Pins (2)
  • Stainless Steel Takedown Pin
  • Stainless Steel Buffer Retainer Pin
  • Stainless Steel Pivot Pin
  • Stainless Steel Pivot/Takedown Pin Detents (2)
  • Stainless Steel Roll Pin
  • Stainless Steel Trigger Guard Roll Pin
  • Trigger Guard Anodized Black
  • Stainless Steel Complete Spring Kit
  • 100% Made in America

Dealers: Please contact our sales team at for dealer pricing and volume discounts.


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  • 5
    Best Mil-Spec LPK

    Posted by Aaron on May 10th 2023

    This is the best LPK that I have used, for custom builds. It doesn't come with a Mil-Spec trigger/FCG that I would replace with a much nicer drop-in trigger. I also use lower receivers, that have trigger guards, built-in. So I don't use the Blackfin included trigger guard. The reason this LPK is so good, is unlike slicker coated LPK, this LPK fits perfectly, to real Mil-Spec. This makes assembly a breeze & function flawless!