BENELLI 83140 SHIM KIT FOR STOCK DROP 20 GAUGE

The Benelli 20 Gauge Stock Drop Assembly Kit (83140) is a factory original shim kit designed to let shooters adjust the vertical drop of the stock on compatible Benelli 20 gauge shotguns, giving you a custom fit without sending the gun to a gunsmith. This 20 gauge shotgun stock fit kit for the Benelli M2, SuperSport, Cordoba, and Montefeltro is a straightforward, low-cost solution for any shooter whose eye alignment and sight picture are off with a standard factory stock position.

Key Features

• Part Number: 83140
• Gauge: 20 Gauge
• Includes: 3 drop shims and 1 reversible drop plate
• Shim Z: 45mm
• Shim A: 50mm
• Shim C: 60mm
• Reversible Drop Plate: Side 1 is C DX and Z SX, Side 2 is C SX and Z DX
• Compatible Models: Benelli M2, SuperSport, Cordoba, and Montefeltro 20 Gauge
• Note: Cast adjustment requires separate Cast Shim, part number 61222 (sold separately)
• Gunsmith installation recommended

Special Features

• Three shims at 45mm, 50mm, and 60mm combined with the reversible drop plate give you multiple drop positions in a single kit, so you can dial in your fit without ordering additional parts.
• The reversible drop plate doubles the utility of a single plate by offering two distinct cast orientation options on each side, letting you fine-tune lateral stock position as well as vertical drop from one component.
• This is a factory original Benelli part built to the same tolerances as the components already in your shotgun, ensuring proper fitment and consistent performance at the stock-to-receiver interface.
• The shim system works by replacing the stock attachment plate at the receiver, a non-destructive, fully reversible adjustment that does not require drilling, machining, or permanent modification to the gun.
• For shooters who need cast adjustment in addition to drop adjustment, the kit is designed to work in conjunction with the separately sold Benelli Cast Shim (61222), giving you access to a full two-axis fit solution.

Practical Benefits

• A stock that fits your drop correctly puts your eye directly on the rib at the moment you mount the gun, which translates directly into faster target acquisition and more consistent shot placement on birds, clays, or moving targets.
• Youth shooters, female shooters, and smaller-framed adults who find standard factory drop too shallow will benefit the most from the adjustment range this kit provides, making a full-size 20 gauge more comfortable and accessible.
• Because the adjustment is fully reversible, you can experiment with shim positions between sessions until you find the drop setting that works best for your mount and build, then return to factory spec at any time.
• Competitive sporting clays and upland hunters running the Benelli SuperSport or Cordoba in 20 gauge will find this kit particularly useful for dialing in fit across different shooting positions and field conditions.
• If you own a Benelli M2, Montefeltro, SuperSport, or Cordoba in 20 gauge and your mount has never felt quite right, the Benelli 20 Gauge Stock Drop Assembly Kit (83140) gives you a practical, factory-correct path to a shotgun that fits the way you shoot.

The Benelli 20 Gauge Stock Drop Assembly Kit (83140) is a smart addition for any 20 gauge Benelli owner who wants a properly fitted shotgun without the cost or commitment of custom stock work.