Wosport GB-37 Magazine Holder for G-Series — Black

The GB-37 mounts directly onto the Picatinny rail of a G-series pistol frame (G17, G18, G19): it attaches to the frame's underrail and integrates a spare magazine housing in the grip area, keeping a reload within immediate reach without relying on external pouches on the belt.

The two integrated side rails allow additional accessories — compact lights, aiming devices — to be mounted without taking up the pistol's main rail, which remains free for gripping. The shaped front section provides a positive purchase for shooters who run their support hand in a forward position, a technique valued in dynamic shooting where muzzle rise control matters as much as rate of fire.

The spare magazine housed in the grip area is accessible with the pistol in hand, without opening pouches or looking down at your gear — a genuine advantage under stress. The trade-off to consider is that the overall footprint of the pistol increases noticeably: the GB-37 adds bulk beneath the frame and may make some standard G17/G18/G19 holsters incompatible. Shooters using slide-retention holsters won't have this issue, while those using holsters with bottom retention should verify compatibility before purchasing.

Key points

• Attaches to the frame's Picatinny rail: no tools required for mounting or removal
• Houses a spare magazine in the grip area, eliminating the need for an extra belt pouch
• Two side rails for accessories leave the main rail free for lights or lasers
• Shaped front section for a solid, positive support grip
• Compatible with G17, G18 and G19