Firearm accessories and attachment systems

A system comprising:

• a firearm having a trigger, a barrel having a barrel axis, and a muzzle attachment at a muzzle end of the barrel;
• the muzzle attachment comprising an attachment body and a lock, the attachment body having an inner surface defining a longitudinal bore extending along a central axis of the muzzle attachment and the lock connected to said attachment body and configurable from a retracted configuration to an extended configuration;
• wherein the muzzle attachment defines a vent opening arranged to vent propellant away from the muzzle attachment along a direction transverse to the central axis;
• wherein when the lock is in the extended configuration when the muzzle attachment is attached to the firearm the lock resists rotation of the attachment body in a first direction relative to the firearm;
• and
• wherein when the lock resists rotation of the attachment body relative to the firearm the muzzle attachment is oriented relative to the firearm such that the vent opening vents propellant away from a side of the barrel that does not face the trigger.

A method for attaching a muzzle attachment to a muzzle end of a firearm, comprising:

• threading a threaded portion of the muzzle attachment to a threaded portion of the firearm;
• wherein the muzzle attachment comprises an attachment body and a lock, the attachment body having an inner surface defining a longitudinal bore extending along a central axis of the muzzle attachment and the lock is connected to said attachment body and configurable from a disengaged configuration to an engaged configuration;
• wherein the lock resists rotation of the muzzle attachment in at least one direction relative to the firearm when the lock is in the engaged configuration;
• wherein the muzzle attachment defines a vent opening arranged to vent propellant away from the muzzle attachment along a direction transverse to the central axis;
• and
• engaging the lock of the muzzle attachment when the vent opening is on a side of a barrel of the firearm different than a trigger of the firearm.