WARNING: Blast Shield CANNOT BE USED with SMC Spare Magazine Holder and full size weapon lights even with the additional Picatinny rail length on this SMC Blast Shield. To use a full size weapon light with the SMC Spare Magazine Holder on this Standard version of the SMC Blast Shield, the Olight Baldr Mini Tactical Light and similar fitment are the only options at this time. The Blast Shield for Strike Modular Chassis (SMC) - ALPHA (Standard) was designed to protect your thumb from muzzle blast and heat. The SMC Blast Shield redirects muzzle blast forward and upward away from the shooters face. For attaching more variety of accessories, this Blast Shield adds more Picatinny rail leng Mfg: Strike Industries