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An automatic firearm is an auto-loading firearm that continuously chambers and fires rounds when the trigger mechanism is actuated. The action of an automatic firearm is capable of harvesting the excess energy released from a previous discharge to feed a new ammunition round into the chamber, and then ignite the propellant and discharge the projectile (either bullet, shots or slug) by delivering a hammer/striker impact on the primer.
If both the feeding and ignition procedures are automatically cycled, the weapon will be considered "fully automatic" and will fire continuously as long as the trigger is kept depressed and the ammunition feeding (either from a magazine or a belt) remains available. In contrast, a firearm is considered "semi-automatic" if it only automatically cycles to chamber new rounds (i.e. self-loading) but does not automatically fire off the shot unless the user manually resets (usually by releasing) and re-actuates the trigger, so only one round gets discharged with each individual trigger-pull. A burst-fire firearm is an "in-between" of fully and semi-automatic firearms, firing a brief continuous "burst" of multiple rounds with each trigger-pull, but then will require a manual re-actuation of the trigger to fire another burst.
Although all semi-automatic, burst-fire, and fully automatic firearms are "automatic" in the technical sense, the terms "automatic weapon" and "automatic firearm" are used to describe fully automatic firearms. Use of more specific terms such as "full-auto", "semi-auto" or "burst-firing" can help avoid confusion. Automatic weapons that can switch between the aforementioned firing modes are known as selective fire weapons.
Automatic firearms are further defined by the type of cycling principles used, such as recoil operation, blowback, blow-forward or gas operation.

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  1. I

    Automatic air vent leaking

    Dear professionals, could someone kindly advise on per below issue, please let me know if more pictures or details needed. I think my Auto Air Vent is now leaking. A little background on the boiler – installed a year ago in Feb, Valiant Heat only boiler Eco Tec plus 424, plus new pump. The leak...
  2. C

    Gravity Fed system in Bungalow with two Automatic Air Vents

    Hi, I’m replacing my old Honeywell Smartfit system on a oil fired gravity-fed system in a bungalow. I’ve read conflicting advice on gravity fed systems requiring an AAV, unless in a bungalow to aid bleeding on first fill? One AAV is in the loft on - what I think - is the boiler return pipe...
  3. M

    Hose connection to automatic water trough

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  4. K

    Vaillant ecoTec Sustain and an Automatic Bypass

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  5. F

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  6. C

    Automatic bypass valve versus open radiator

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  7. B

    Altecnic Eres automatic bypass valve correct setting number

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  8. C

    Automatic bypass and radiator thermostatic valves

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  9. C

    Automatic bypass query

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  10. drippy

    Need user manual

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  11. G

    Automatic air vent screw

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  12. lloydh

    Automatic Bypass Valve After Mid-Position Valve

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  13. Meady

    Filling loops + automatic air vents for sale.

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  14. P

    Automatic Air Vents?

    Hello My new boiler has a built-in AAV. The old AAV in the airing cupboard upstairs is gunked up and not working. I assume there's no need to replace this....? Thanks Chris
  15. B

    Gas supply and automatic interior switc

    Gas heating is set to come on 2hours per day via interior automatic switch. I would like a neighbour to go and turn gas supply off at mains as she has no key. I am away. Is this safe? but i but I want a neighbour to
  16. T

    Regulating a manual & automatic air vent valve from Emmeti

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  17. H

    Bleeding a system with an automatic valve (but gurgling pipes)

    My central hot water heating system has developed a very loud gurgle every time the heat comes on, so clearly has quite a bit of air in the system. It has a Taco Hy-vent automatic valve above the tank in the utility room and no bleeder valves elsewhere in the system. Should I just replace the...
  18. Bogart

    Honeywell EA122 automatic bleed valve

    Am going to fit an automatic bleed valve to replace the knackered manual one. Reading the Honeywell blurb it says it should be fitted on the positive side. Is there any reason for this? and could I not fit it on the negative side?
  19. D

    Noisy automatic bypass valve or pump?

    Hi I have a vaillant ecotec plus condensing boiler which is in the kitchen with an indirect unvented centerstore cylinder in the airing cupboard. All has been well for 18 months (the cylinder was installed in April 2018.) The last few months there has been noise in the airing cupboard which...
  20. Dan

    Warning system now in place - automatic account restrictions for wasting Moderators time

    I've setup the warning system to take the pressure off of staff. Get a warning for wasting the time of staff by replying with more smarmy remarks or whatever and your account will have restrictions applied. Staff can and will reply to one post and give a verbal warning / correction. No...
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