Runestone Group MP5 Magazine Adapter for New Frontier Armory, Triton MFG, and other similar PCC lower receivers with CMMG Banshee RDB kits.

The Runestone Group mag adapter is specifically engineered to eliminate over travel on NFA and Triton MP5 mag fed lower receivers when using the CMMG radial delay system. This solves the issue of the magzine sliding up the mag well while the bolt is open causing cycling feeding and failure to go into battery malfunctions. Upon installation this adapter ultimately increases the reliability of your pistol caliber carbine.

Manufactured via laser sintering additive manufacturing from J-10 stainless steel which provides 3x Wear Resistance 3x Toughness and 10x Corrosion Resistance over standard stainless steel. Then coated in Cerakote H series black for even further improved wear resistance and functionality.

(Note shown in raw for initial photos)

Install is as simple as removing your lower’s factory feed ramp block, and extractor bar then replacing the feed ramp with our patent pending mag adapter. Retention of the adapter is provided by the original set screw in the lower and installs the same as the factory part allowing for standard replacement screws to be purchased direct from NFA or other manufacturers if needed.