Brouwer Grip Module Magwell Anodized Black/Cerakote Black. Specifications for Brouwer M1811 Magwell: Manufacturer: Brouwer Gun Make: SIG Sauer Gun Model: SIG Sauer P320 Features of Brouwer M1811 Magwell The Magwell extends the margin of error when performing magazine changes by increasing the magwell opening diameter and providing a smooth transition for feeding. Special consideration was made to ensure that the addition of the Magwell would maintain the same grip index and repeatability of the M1811. In order to achieve this the external profile was designed to minimize impact and interference with the users grip. The rear of the Magwell was designed to fit below the profile of the grip to reduce impact to the users palm swell. The front and sides of the Magwell were designed to offer a secondary index point that cradles the users hand at the bottom of the front strap. Package Contents: Brouwer M1811 Magwell What firearm models does the manufacturer say Brouwer M1811 Magwell is compatible with? The manufacturer says that Brouwer M1811 Magwell is compatible with SIG Sauer P320Brouwer M1811MW-T6-ACBLK: M1811 Grip Module Magwell Anodized Black/Cerakote Black