MM BK1S SIG 552 Handguard Kit

The MM BK1S SIG 552 Handguard Kit recreates the SIG 552's slim M-LOK handguard profile for your BK1S build, giving you M-LOK slots along the length of the handguard for mounting accessories in whatever pattern you need rather than being locked into fixed picatinny rail sections. It's a noticeably slimmer, more streamlined look than the quad-rail MK18 handguard also in our lineup, if you'd rather skip the bulk.

The kit is a complete swap: it includes a receiver body rail base, the SIG 552 handguard itself, a barrel nut, and a gas block for the correct SIG-style profile up front. Note: this kit is not compatible with the MM Ambidextrous Charging Handle, so check your current charging handle setup before ordering. Available in black, yellow, and silver, with other colours available on request.