The Sharps Bros Enhanced Grip Module features enhanced trigger-guard geometry with undercut and finger grooves for improved comfort and control. The Sharps Bros grip module with wood panels weighs approx. 7.5 ounces. For comparison, The OEM M18 (polymer) grip modules from Sig weighs ~3.5 ounces. The extra ~4 ounces is hardly (if at all) noticeable while holstered, but while shooting the extra weight helps reduce felt recoil. The OEM P320 AXG grip module from Sig weighs ~7.7 ounces. Machined from billet 7075-T6 Aluminum. FeaturesM1913 Picatinny accessory railFlared magazine wellDirect replacement of the Sig Sauer OEM standard polymer or AXG P320 grip moduleSeats Sig OEM 17rd magazines and 21 round magazines (15rd XCompact magazines are too short for this model). Fits standard P320 holsters Notes:Fire Control Unit not includedMagazine release assembly not included. Reuse your stock mag release assembly.