Quick-detach optics and accessory mounting system for firearms
An accessory mounting system offering quick disconnect and true return-to-zero reattach is described. The mounting system includes a base, which is attached to the host platform, and a top mount onto which one or more accessories can be mounted. The base may be installed with a friction clamp and can remain attached to the host platform while the top mount can be removed and returned while keeping all optics and lasers mounted. The coupling of the base and top mount can provide sufficient precision such that the mounting system can retain zero upon reattach. The top mount may include one or more rail segments, which can enable the mounting of a laser system in conjunction with a top mounted optic, even when the firearm is used in conjunction with a gun shield.
1. A firearm accessory mounting system, comprising:
a base assembly comprising:
a host connector on a bottom side of the base assembly operable to couple with a firearm; and
a mount connector on a top side of the base assembly, the mount connector comprising a first rail connector; and
a top mount comprising:
a base connector on a bottom side of the top mount, the base connector being detachably coupled to the first rail connector of the mount connector of the base assembly, the base connector comprising:
a first side member integrally formed with a body of the top mount, the first side member comprising a first flange engaging a first side of the first rail connector;
a second side member comprising a second flange engaging a second side of the first rail connector; and
a clamping assembly applying a releasable lateral force on the second side member to releasably couple the base connector to the first rail connector, wherein the clamping assembly comprises a movable side clamp flange and at least one lever configured to apply a lateral force onto the movable side clamp flange; and
a second rail connector on a top side of the top mount;
wherein:
a lateral centerline of the first rail connector is laterally offset from a lateral centerline of the base assembly; and
the second rail connector of the top mount extends longitudinally on the top side of the top mount such that the second rail connector of the top mount vertically overlaps the centerline of the base assembly.
2. The firearm accessory mounting system of claim 1 , wherein the host connector of the base assembly comprises:
a first side member comprising an upper end and an opposing lower end, wherein the upper end of the first side member is coupled to a body portion of the base assembly and the lower end of the first side member comprises a first flange member; and
a second side member comprising an upper end and an opposing lower end, wherein the upper end of the second side member is coupled to the body portion of the base assembly and the lower end of the second side member comprises a second flange member.
3. The firearm accessory mounting system of claim 2 , wherein the host connector of the base assembly further comprises:
a vertical set screw assembly comprising a plurality of vertically-oriented set screws and at least one force distributing top plate coupled to a distal end of at least one of the plurality of vertically-oriented set screws; and
a lateral set screw assembly comprising a plurality of laterally-oriented set screws extending through the first side member and at least one force distributing side plate coupled to a distal end of at least one of the plurality of laterally-oriented set screws.
4. The firearm accessory mounting system of claim 2 , wherein a vertical distance from a bottom surface of the body portion of the base assembly to an upper surface of the second rail connector of the top mount is less than approximately 2.5 inches.
5. The firearm accessory mounting system of claim 1 , further comprising:
a firearm having a receiver portion, wherein the host connector of the base assembly is detachably coupled to the receiver portion.
6. The firearm accessory mounting system of claim 5 , wherein the firearm comprises a belt-fed crew-serviced machine gun.
7. The firearm accessory mounting system of claim 5 , wherein the firearm comprises an M2 machine gun.
8. The firearm accessory mounting system of claim 5 , wherein:
the firearm further comprises:
a rear sight coupled to the receiver portion; and
a front sight coupled to a barrel group of the firearm; and
the top mount further comprises a sight passage opening extending a length of the top mount, wherein a line of sight from the rear sight to the front sight passes through the sight passage opening.
9. The firearm accessory mounting system of claim 1 , wherein the top mount further comprises:
a third rail connector on a lateral side of the top mount.
10. An accessory system, comprising:
a base assembly comprising:
a body portion;
a host connector on a bottom side of the base assembly comprising:
a first side member having a first upper end coupled to a first side of the body portion and a first lower end comprising a first flange; and
a second side member having a second upper end coupled to a second side of the body portion and a second lower end comprising a second flange; and
a first rail connector on a top side of the base assembly, the first rail connector comprising a narrow lower portion and a flanged upper portion; and
a top mount comprising:
a base connector on a bottom side of the top mount, the base connector comprising a lower flange and an adjustable side clamp detachably coupled to the first rail connector of the base assembly; and
a second rail connector on a top side of the top mount;
wherein:
a centerline of the first rail connector is laterally offset from a centerline of the base assembly; and
the second rail connector extends longitudinally on the top side of the top mount such that a centerline of the second rail connector is aligned with the centerline of the base assembly.
11. The accessory system of claim 10 , wherein:
the body portion of the base assembly comprises at least one set screw configured to apply a downward force on a receiver component positioned between the first side member and the second side member.
12. The accessory system of claim 10 , wherein:
the body portion of the base assembly comprises at least one lateral set screw extending through the first side member and configured to apply a lateral force on a receiver component positioned between the first side member and the second side member.
13. The accessory system of claim 10 , wherein:
the adjustable side clamp detachably comprises a movable side clamp flange and at least one lever configured to apply a lateral force onto the movable side clamp flange towards the lower flange when tightened.
14. The accessory system of claim 10 , further comprising:
a firearm having a receiver portion received between the first side member and the second side member of the host connector.
15. The accessory system of claim 10 , wherein:
a vertical distance from a bottom surface of the body portion of the base assembly to an upper surface of the second rail connector of the top mount is less than 2.5 inches.
16. The firearm accessory mounting system of claim 5 , wherein:
the host connector of the base assembly is detachably connected to the receiver portion of the firearm without use of a rail.
17. The accessory system of claim 14 , wherein:
the firearm further comprises:
a rear sight coupled to the receiver portion; and
a front sight coupled to a barrel group of the firearm; and
the top mount further comprises a sight passage opening extending a length of the top mount, wherein a line of sight from the rear sight to the front sight passes through the sight passage opening.