HTIS Airsoft does what he says to be a rambling review of the GHK SIG 553 GBB Rifle. The GHK 553 is a compact GBB airsoft rifle, faithfully replicating its real-world counterpart. It boasts a top picatinny rail, folding stock, and interlocking magazines allow for lightning-fast reloads. Its compact size makes it ideal for CQB scenarios.