Caliber convertible AR-15 upper receiver system
US7444775B1 · kind B1 · utility
Inventor
Key dates
| Filing date | Sep 12, 2006 |
| Grant date | Nov 4, 2008 |
| Priority date | — |
| Expiry date | May 3, 2027 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF41A21/10
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A system that converts an original equipment (OEM) AR-15 rifle to a rifle capable of firing cartridges of at least two different calibers. Two or more barrel liners are provided for cartridges of differing calibers. Each liner is insertable through a rear opening of an upper receiver portion of the rifle and into a smooth bore barrel of a modified barrel assembly. Each liner comprises a tube portion having a longitudinal bore and a head portion with an opening that communicates with said bore. An adapter bolt carrier assembly is substituted for the OEM AR-15 bolt carrier assembly. The substituted assembly includes a bolt that carries the firing pin and is slidably mounted on a rail guide. A front end of the rail guide has a tongue extension with a slot that receives a pin attached to a rear end of a liner head. A support rail is fixed to a rear end of the rail guide. A spring extends from the support rail to the bolt, thereby pressing the bolt against the liner head. A magazine insert, insertable into an OEM ammunition magazine, accepts cartridges of differing calibers.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.