Firearm with tubular handguard mounting system

摘要

A firearm with tubular handguard mounting system is provided. The firearm includes receiver, a barrel having a breech threadably engaging the receiver, and a handguard. A primary barrel nut threadably engages the breech end of the barrel and is moveable into abutting contact with the receiver to form a tightened barrel to receiver connection. A secondary barrel nut threadably engages the primary barrel nut and is tightened thereto to trap an external annular barrel flange between the primary barrel nut and an annular abutment surface on the secondary barrel nut. The secondary barrel nut provides a free float tubular handguard, such as an AR-15 type handguard. Additionally, the primary barrel nut and secondary barrel nut provide a dual locking feature which resists loosening of the barrel connection.

主权项

1. A firearm with tubular handguard mounting system comprising:
a receiver; a barrel supported by the receiver, the barrel comprising a muzzle end and a breech end threadably engaging a threaded bore in a front end of the receiver; a primary barrel nut threadably engaging the breech end of the barrel, the primary barrel nut abuttingly engaging the front end of the receiver; a secondary barrel nut assembly threadably engaging the primary barrel nut, the secondary barrel nut assembly including an annular abutment surface abuttingly engaging an external annular flange on the barrel, the external annular flange on the barrel compressed against the primary barrel nut by the annular abutment surface on the secondary barrel nut assembly; and a tubular handguard mounted to the secondary barrel nut assembly and encircling at least part of a length of the barrel.