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1st Shots- Icon Marketing Group 12ga Upper + PSA 308 Lower + @GreyMarketResearch Super Safety 😈

PoorBoy Arms
Published on March 10, 2026
Category: Gunsmithing & DIY
Duration: 2:27

This guide details the assembly and initial live-fire testing of a unique firearm configuration: an Icon Marketing Group 12-gauge upper receiver paired with a Palmetto State Armory .308 lower receiver, featuring a Grey Market Research Super Safety. The process involves careful component integration, ammunition selection, and live-fire evaluation to assess performance, including cycling, ejection, and recoil management. Instruction is provided by an experienced individual demonstrating hands-on knowledge of custom firearm builds.

Tags

IMG 12ga Upper
PSA 308 Lower
Grey Market Research Super Safety
12 Gauge
Custom Build
AR-10
Shotgun Conversion
Range Testing
Firearm Modification
Ammunition Testing
Recoil System
Bolt Carrier Group

Quick Summary

This custom build combines an Icon Marketing Group (IMG) 12-gauge upper with a Palmetto State Armory (PSA) .308 lower, featuring a Grey Market Research Super Safety. Live-fire testing evaluated various 12-gauge shells, noting a failure to eject issue despite adjustments to the gas system and recoil components like a 5.6 oz buffer and Sprinco spring.

Chapters

  1. 00:00Introduction and Build Components
  2. 00:19Testing Plan and Ammunition
  3. 00:35First Shot Preparation
  4. 00:44Initial Firing and Reload
  5. 00:53Successful Shot
  6. 01:06Celebrating Build Success
  7. 01:22Recoil System Specifications
  8. 01:38Continued Firing and Observations
  9. 01:54Addressing Ejection Issues
  10. 02:15Final Thoughts and Showcase

Frequently Asked Questions

What components make up the custom 12-gauge AR-style rifle build?

The build features an Icon Marketing Group (IMG) 12-gauge upper receiver paired with a Palmetto State Armory (PSA) .308 lower receiver. It also incorporates a Grey Market Research Super Safety selector and utilizes a 5.6 oz .308 buffer with a Sprinco orange recoil spring.

What types of ammunition were tested in the custom 12ga AR build?

The testing involved various 12-gauge shotgun shells, including birdshot and dove shot. Both low and high velocity shells were planned for evaluation to assess the firearm's performance across different power levels.

What issues were encountered during the live-fire testing of the custom build?

During testing, a failure to eject a shell was observed. This occurred even with the gas system set to its lowest setting, indicating potential tuning challenges for reliable cycling and ejection in this unique configuration.

What is the significance of the Grey Market Research Super Safety in this build?

The Grey Market Research Super Safety is a specific aftermarket component installed on the PSA .308 lower receiver. Its inclusion suggests a focus on enhanced safety features or specific operational characteristics desired by the builder.

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