RCM - Sig Sauer M400 / 516 Magwell Model:516 G3 The M5 RCM H works

The M5 RCM H works great for unconventional shooting positions

NOTE: This is a small restock once again

M400-TREAD and SIG 516 lowers

The KUNA RCM (Rifle Combat Magwell) features a 250% larger flared funnel surface allowing for consistent and fast reloads under any condition and is designed for Springfield Armory KUNA lowers

RCM - Sig Sauer M400 / 516 Magwell Model:516 G3 The M5 RCM H worksRifle Combat Magwell for Sig Sauer M400 M400 SDI The Sig Sauer M400 RCM (Rifle Combat Magwell) features a 250% larger flared funnel surface allowing for consistent and fast reloads under any condition and is intended to fit the SIG M400, M400 PRO, M400 TREAD and SIG 516 lowers. The SDI model will fit on SIG M400 SDI, SDI X or DH3 models. The 516 G3 model will fit on the newer SIG 516 G3 lowers. THERE ARE MULTIPLE VARIATIONS OF LOWER RECEIVER UNDER THE