For LCT various designs LCK
■ LCK-74 / MRK-74 / LCKS-74 / LCKS-74M / LCK-74M / LCK-74MN / STK-74 / ZKS-74M / G-03 / G-03M / LTS Keymod 13.5 / M-LOK LCKM

■ LCKM / LCKM (Stainless Steel) / LCKMS / LCKM Economy / LCKMMS / AIMS / AIM Carbine / LCKM-63 / AMD-65 / TX-63 / TX-65 / TX-5 / TKMS / TIMS

■ LCK-104 / LCK-105 / MRK-105 / ZK-104 / TK-102 / TK-104 / TK-105 / TX-M / TX-MIG / LTS-Keymod 9.5 / G-04 / G-04M / MG-MS / M-LOK LCK104

■ RPK / RPKS-74 / RPKS-74MN ( Retainer should be dismantled )

If it non-LCT products，we can't sure compatible or not。

■PK-190 LCKM-63 Gas Tube be required before assemble PK-420 9.5 inch M-LOK Handguard。