What you need
- 01 .308 80% Lower – Billet - polymer 80 Enjoy the classic black look with our .308 80% lower receiver. Made from billet 6061-T6 Aluminum, these are...
- 02 Polymer80 80% Lower Receiver and Jig Kit (LR-308) - polymer 80 We have temporarily stopped production of the Polymer 80 kits, and we are running our final sales for those who wish...
- 03 Polymer80 LR-308 80% Lower Receiver - polymer 80 We have temporarily stopped production of the Polymer 80 kits, and we are running our final sales for those who wish...
- 04 80% Lower Fire/Safe Marked - Anodized Black - polymer 80 Our famous, original forged 80% lower.
- 05 80% Lower Fire/Safe Marked - Raw - polymer 80 Our original forged 80% lower, now available uncoated.
- 06 80% Lower Patriot Pack - polymer 80 Build all three ARs with one 80% lower combo kit.
- 07 Polymer80 RL556V3™ and PF940Cv1™ Bundle - 80% Lower Receiver with Jig, AR15, and 80% Compact Frame with Jig, G19/23 Compatible (Black Only) - polymer 80 We have temporarily stopped production of the Polymer 80 kits, and we are running our final sales for those who wish...
- 08 80 Percent Lower | 80% Lowers | VERY FAST SHIPPING - polymer 80 80 percent lower is a premeir retailer & your source for the best 80% lower AR-15 and .308 80% Lower Receivers,...
Build & troubleshooting library
- guide The Complete Guide to Adjusting Slide Stop Tension in Spectre Kits
- how-to Best Drill Bits for Polymer Frame Modifications: A Technical Guide
- how-to Best Lubricants for Polymer Slide Surfaces: A Technical Guide
- how-to Calculating Polymer Frame Warranty Coverage Limits: A Precise Guide for ModFuze Customers
- how-to Calculating Slide Travel Tolerance in Polymer Frames: A Precise Guide
- how-to Calculating Weight Distribution for Polymer Pistols: A Precise Guide
- how-to Common Mistakes in DIY Polymer Frame Builds (And How to Avoid Them)
- how-to Diagnosing Common Rail Binding Issues in Polymer Frames
- how-to Comparing Polymer Versus Metal Rail Durability: Data‑Driven Insights for ModFuze Users
- how-to Diagnosing Slide Freeze in Spectre Builds: A Technical Guide
Read first. Build slow. Test twice.
— ModFuze / built by Marlon K. Voss