Dropin Autosear

I don't like drop-in auto-sears! Not because they don't work, because they do. They not only work, but in my experience an AR-15 equipped with a drop-in auto-sear works as well as an original government issue M-16.

The problem's not with the auto-sear, it's with the laws governing its use.

The drop-in auto-sear was designed in the mid 1970's for the sole purpose of converting the AR-15 to fire full-autD (select fire].

If you buy a drop-in auto-sear that was manufactured after November 1st, 1981. it is by itself classified a machinegun, and must be serial numbered and registered with B.A.T.F. as such. If it was manufactured before then, it in itself is not a machinegun. Of course, if you put it in your AR-15 then it is a machinegun. and as such is illegal, because although it was manufactured before, but not registered before midnight May 19. 19B6 it can not be registered after that date.

Also, for the drop-in auto-sear to work in the AR-15 you need an M-16 hammer, disconnector, trigger, selector switch, and bolt carrier.

If you have all of the above listed parts BUT NO GUN, under federal law you have a machinegun. That may sound crazy, but that's the law.

The fact that a post November 1st. 1981 drop-in auto-sear must be registered as a machinegun is bad news. If you bust it. to get your gun working again you must not only buy a new one for anywhere from two to three hundred dollars, you must also pay the $200.00 tax on the new one.

If that's not bad enough, if you shpuiil lose it. you have lost a machinegun and B.A.T.F. gets very unhappy about that.

One last thing about using the drop-in auto-sear. With the sear removed from the weapon, you would think you once more have a legal semi-auto firearm. NOT SO! With the necessary M-16 parts installed, if you put the selector on full-auto the disconnector will not work. The hammer will follow the bolt forward if you hold the trigger back. This causes what is knows as slap fire and is dangerous. If the bolt has not locked before the cartridge fires you will have one hell of a blast coming out the ejection port. That's bad, but worse is yet to come. B.A.T.F. has ruled, if a weapon will fire more than one shot with each pull of the trigger, it's a machinegun.

Even though you believe you did everything right and paid the tax on the drop-in auto-sear, by putting the other M-16 parts in your AR-15, you have unwittingly manufactured an unregistered machinegun.

You would at that time be liable for a fine and imprisonment.

TO RECAP: to buy a registered post November 1st, 1901, drop-in auto-sear from a Class III dealer is legal.

To have an AR-15 with M-18 parts installed is illegal

To have M-16 parts although you have no gun is illegal.

To have an unregistered drop-in auto-sear is illegal.

drop-in auto se drop-in auto se

Illegal Converted Weapon

Was this article helpful?

+6 -13
Perfect Tattoo

Perfect Tattoo

Ever Wanted to Get a Tattoo? Here is a Priceless Guide on How to Choose the Perfect Tattoo! Do you ever find yourself admiring the artistic work of another person’s tattoo? Do you wish you had the nerve to get one of your own but just aren’t sure you know enough about them to take that final step?

Get My Free Ebook


  • Daniela
    How does an ar 15 drop in auto sear work?
    9 years ago
  • kathrin
    Is auto disconnector needed with a drop in seer for m16?
    8 years ago
  • Pauline
    How does an autosear work?
    7 years ago
  • quirico greece
    How does a dropin sear work on m16?
    7 years ago
  • saare dahlak
    How does a drop in auto sear for a ar15 work?
    7 years ago
  • robert
    How to make a drop in auto sear?
    5 years ago
    How to make an ar15 drop in auto sear?
    3 years ago
  • heather
    How to build a drop in Auto Sear?
    3 years ago
  • settimio
    Can an auto sear be fabricated?
    2 years ago
  • venla
    Where to buy dropin auto sear?
    2 years ago
  • anna
    How many registered ar15 drop in sears made in oregon?
    2 years ago
  • holman
    How to add auto sear to lower?
    2 years ago
  • sofia seppinen
    What parts are needed with a drop in auto sear?
    1 year ago
  • silvana
    What drop in auto sear works best for ar 15?
    1 year ago
  • osman girmay
    How to build a full auto sear?
    1 year ago
  • mebrahtu
    How drop in auto sears work?
    1 year ago
  • siiri aravirta
    How a legal auto sear works?
    1 year ago
  • doreen schulz
    How to install a drop in auto sear.?
    1 year ago
    Can parts be purchased to build assemble auto m16?
    1 year ago
  • nuguse
    How does an auto fire sear work?
    1 year ago
  • Marian Diaz
    How to make auto sheer for ar15?
    1 year ago
  • Petros
    How does.a drop.in.auto.sear work arq5?
    1 year ago
  • Amethyst
    How much does a ar15 drop in sear cost?
    1 year ago
  • asmait
    How effective is full auto sear?
    1 year ago
  • poppy
    How to replace a auto sear ar15?
    1 year ago
  • betty williams
    Is it legal to 3d print a drop in auto sear?
    1 year ago
  • delmina
    What parts are needed to convert an ar15 to an m16?
    12 months ago
  • elen
    How to use a dias ar15?
    11 months ago
  • goldilocks
    What is drop in auto sheer?
    11 months ago
  • melissa
    Is it legal to own a sear kit in wyoming?
    10 months ago
  • madoc
    How to install automatic switch on my ar 15?
    10 months ago
  • Eleleta
    How to build an illegal m16?
    10 months ago
  • anneli
    How does a dias work in a ar 15?
    10 months ago
  • belladonna
    How to buy a m16a1 lower legally?
    10 months ago
  • elisabetta
    How to create a auto sear ar15?
    10 months ago
  • osman
    Do you need a full auto selectorn switch for a dias?
    9 months ago
  • arcangelo
    How to drill full auto sear?
    9 months ago
  • giulia genovesi
    How does a drop in auto sear for guns work?
    9 months ago
  • doreen
    How does a safteydrop sear work?
    9 months ago
  • Tytti
    What type of gun does a drop in auto sear repair kit work with?
    8 months ago
  • mariam
    What is drill size for auto sear in a m16?
    7 months ago
  • darnell
    How to purchase a ar15 auto sear?
    7 months ago
  • Anna
    How does dias for ar15 work?
    7 months ago
  • Sabrina
    What is needed to work with the registered drop in auto sear?
    7 months ago
    What is the cost of AR 15 auto sear?
    7 months ago
  • marigold
    How to make my ar15 full auto?
    6 months ago
  • elia genovese
    Do you need a full auto fire group.for a drop in auto sear?
    6 months ago
  • KYLE
    How hard is it to make an auto sear?
    5 months ago
  • Kai Vilen
    Can an individual make an auto sear for their ar?
    5 months ago
  • ivan
    Which lowes will take a drop in auto sear?
    5 months ago
  • amie
    What is rdias sear for ar15?
    5 months ago
  • Luwam
    How much is a full auto sear firearm?
    4 months ago
  • crescenzo
    How much does a drop in auto sear cost for ar15?
    3 months ago
  • pervinca
    Is it legal to put m16 parts in ar15 if not fully auto?
    2 months ago
  • adaldrida
    Can you make a home made auto sear?
    2 months ago
  • cillian scott
    Can you legally buy an auto sear for an ar15?
    1 month ago
  • Uta
    1 month ago
    How many drop in auto sears are on the nfa registry?
    1 month ago
  • john
    How to purchase full auto sear for ar 15?
    1 month ago
  • hiwet
    What is required to use an autosear in an ar?
    24 days ago
  • laura graham
    How to report someone converting ar15 to full auto?
    22 days ago
  • Emmi
    How dose a drop in auto sear work?
    22 days ago
  • jolanda
    How toinstall 3 way selector switch in an ar 15?
    17 days ago
  • Basso
    What is the serial numbered metal part called that transform an ar15 to full auto?
    10 days ago

Post a comment