RIMFIRE BLANK ADAPTOR KIT FOR M16 RIFLES
First Claim
1. A conversion kit for a rifle having a full chamber for seating a full size cartridge, a receiver behind the full chamber, a standard bolt movable along a path in the receiver for feeding a full cartridge to and firing a full cartridge in the full chamber to conduct a gas activated firing cycle for the rifle, and an automatic fire sear connected to the receiver and movable into the path of movement of the standard bolt for engagement by the bolt during a firing cycle to produce automatic gas activated firing of the rifle, the conversion kit comprising:
- a chamber insert adapted to be fixed in the full chamber and defining a reduced chamber for seating a reduced size cartridge;
a replacement bolt adapted for movement in the receiver behind said chamber insert for feeding a reduced cartridge to and firing a reduced cartridge in said reduced chamber to conduct a blow back activated firing cycle;
a sear trip bar engagable by said replacement bolt and positioned to engage the sear of the rifle when the sear is in the path of movement of the standard bolt so that said sear trip bar engages the sear to produce automatic blow back firing of the rifle with reduced cartridges; and
detent means connected to said chamber insert for engaging and momentarily holding said replacement bolt against said chamber insert when said replacement bolt strikes said chamber insert during a firing cycle to prevent bouncing of said replacement bolt from said chamber insert during automatic blow back firing of the rifle.
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Accused Products
Abstract
A conversion kit for allowing an M16 rifle to fire .22 caliber ball and bk ammunition in semi-automatic and automatic firing modes, comprises a bolt replacement which replaces the standard bolt in the rifle. The bolt replacement moves in the rifle receiver and is engageable with a sear trip bar of the conversion kit. The sear trip bar interacts with an automatic sear of the M16 rifle to permit automatic fire. A spring loaded detent is provided in the conversion for engaging a detent slot in the replacement bolt, to hold the bolt face against a chamber insert, to avoid bouncing of the bolt for automatic and burst firing modes. For the firing of blank cartridges, a shaft is provided in a chamber insert for reducing the diameter of the chamber insert to preclude the feeding of ball cartridges. An orifice in the shaft allows for escaping gases to leave the blank cartridge, but produces back pressure so that the replacement bolt can be cycled for blow back operation.
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Citations
10 Claims
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1. A conversion kit for a rifle having a full chamber for seating a full size cartridge, a receiver behind the full chamber, a standard bolt movable along a path in the receiver for feeding a full cartridge to and firing a full cartridge in the full chamber to conduct a gas activated firing cycle for the rifle, and an automatic fire sear connected to the receiver and movable into the path of movement of the standard bolt for engagement by the bolt during a firing cycle to produce automatic gas activated firing of the rifle, the conversion kit comprising:
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a chamber insert adapted to be fixed in the full chamber and defining a reduced chamber for seating a reduced size cartridge; a replacement bolt adapted for movement in the receiver behind said chamber insert for feeding a reduced cartridge to and firing a reduced cartridge in said reduced chamber to conduct a blow back activated firing cycle; a sear trip bar engagable by said replacement bolt and positioned to engage the sear of the rifle when the sear is in the path of movement of the standard bolt so that said sear trip bar engages the sear to produce automatic blow back firing of the rifle with reduced cartridges; and detent means connected to said chamber insert for engaging and momentarily holding said replacement bolt against said chamber insert when said replacement bolt strikes said chamber insert during a firing cycle to prevent bouncing of said replacement bolt from said chamber insert during automatic blow back firing of the rifle. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification