Locking Ring

Some articles on locking ring, locking:

Brügger & Thomet APR - Design Details - Features
... The upper receiver consists of a housing, in which a locking ring is permanently fixed, and a Picatinny rail as an interface to the rifle scope ... Into the above mentioned locking ring, the bolt locks by rotation thus, the receiver with locking ring, bolt and barrel form the breech of the rifle ... APR rifle has a traditional manually operated rotary bolt with three radial locking lugs at the front ...

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