Full auto and Autoburst Modifications
Full automatic and select fire on the AR15/M16.
The M16 series weapon was designed to be capable of intermittent full automatic operation. There are several ways to legally and illegally convert a semi-auto AR15 to full auto. The legal technicalities are best explained by various experts at subguns.com and this link.
After personally viewing several auto conversions and trigger activator devices, my personal conclusion is that the drop-in sear (DIAS) represents the worst combination of legal risk and functionality, with the lightning link being the lowest risk, but least functional, internal device available. Both of these devices are available as legal class III items and gray market / black market items. Given the cost, legal considerations and lack of dependability, I cannot recommend them as serious survival tools.
External trigger activator devices are open market items which are generally legal to install on a firearm. They are less reliable than even the lightning link, but offer a decent legal and low cost alternative to the cost and risks of dealing with "real" full auto. The best one currently on the market is called the "Autoburst". It is a bitch to get working right, but with some modification, it provides the user a means of firing a respectable rate of fire while maintaining decent accuracy. More information will be provided on this later.
Functionally, the best full auto M16 is going to be done in the GI pattern "A1" style. This is also the most permanent and difficult conversion done on a semi-auto receiver or rifle. Since the modification is nearly impossible to conceal once done to the rifle, I would not perform this illegally except under the most dire need. Given that dire need might arise, the survivor is well advised to understand the mechanics of the conversion long before attempting it so that instructions would not be necessary if the conversion needs to be done under primitive circumstances. These instructions are by no means complete, and other knowledge about this is available in books or on the web. Please to not inquire about this by email.
Regarding the jig (this section was clipped from the jig instruction page)
The remaining holes come easy, just drill out the remaining trigger group holes. Do not drill out the hole directly above the selector lever unless you are going to be using a GI auto sear. UPDATE: Due to legal considerations, the auto sear hole will not be included on the jigs. Jigs may be modified for this, but only by the end user. The exact location of this pin hole is not on regular AR15 blueprints as it is limited to full auto use and not needed on legal semi-auto guns. The location was set by reverse engineering the location on a GI lower. It may not be perfect to spec, but it should work. There are disputes over whether the auto sear pin should be located either 1/8" or 5/32" below the top plane of the lower but it should be directly centered above the selector hole. A gunsmith familiar with the operation of the auto sear will know how to make adjustments to the shape of the sear if they are needed. This modification is also not to be done in conjunction with a drop-in sear or lightning link, as both use a different system for achieving full auto. The Tannery lowers are also not fully compatible with M16 internals without modifying the trigger group well of the gun. Blueprints and instructions for this modification are not available from me or this website, but can be found elsewhere with diligent searching. Don't expect answers to emails about "how do I make an M16" or more clarification on using the jig to make an M16 lower.
A jig may be modified by locating the auto sear pin hole through either measuring it off, or using one of the smaller cheaper "auto sear drilling jigs" available on the market. Highly recommended is one sold by Tom Bowers at subguns.com .
As stated, the jigs we sell are not particularly suited for full auto conversions, and are generally not used for such. Under the current known regulation, possession of tooling is not being used as evidence of illegal intent, but there are cases pressed on possession of full auto parts and semi-auto guns. Note that the full auto parts in question are usually quite small; an entire set can easily fit inside a small plastic container and buried or hidden. Note that the deal seems to surround "possession" of the items in the same place at the same time, not concurrent ownership of the items in different locations which are not in close proximity to each other.