Debur 16. with the mill head and/or tool holder. The M16 is a fully automatic weapon and it would be illegal to build one in the "US" - as I was careful to mention. these blueprints will put the long debated ar 15/ m16. mil spec vs. non-milspec lower receiver debate to rest. So when a Gunbroker listing popped up advertising seven vintage M16 Colt 3-hole lowers for under $500 each – “discreet PayPal accepted” – my suspicion radar went way up. If out of tolerance, carefully consider how it will affect the function of your lower. Same goes for the M4/M16 if you can machine from scratch a AR15 you can do a M16 and if you can do a M16 then you can do a M4. All dimensions should be within the tolerance noted on the drawing. One thing to remember that possessing certain combinations of parts can be charged as constructive possession and land you in jail for a long time with big fines. If someone has the machines and ability to machine an AR15 lower from scratch then figuring out the difference between the AR15/M16 and doing it should be easy. 15. All the info is on … So what makes it not M16? This is not a second just not completed to be called a lower receiver, or considered a firearm. We recommend fixturing and leveling the work piece horizontally in a vertical mill or drill press to ensure a straight hole through the lower. Until then this is not an operational firearm. When You assemble the Lower Receiver with the parts included in the kit, this will be a fully functional rifle. trying to print now, but I … Mill a trigger slot, swap lowers, mill the next trigger slot, swap lowers... rinse and repeat. this is the most useful post on r/guns ever. 3) Placing a lower flat on its side on a single plate allows you to hold it for engraving. My post was not so much an answer to the OP but as a warning to members who may not be aware of the NFA that building a true M16 would not be a good idea. 80 percent lower receiver No FFL required and All machine work that has been done is within Mil-Spec specifications. This is the AR15 / M16 Size. I will also pay you moneys for a usable copy of this. That's an interesting lower if you read the specs. Like that feature above and the threaded bolt catch and takedown pin are nice, especially for the price. Machining an AR15 Lower Forging - August 26th, 2016 Back in late February I stumbled across a guy selling raw M16 lower forgings on Gunbroker. The market share was largely owned by Colt and their SP-1 … AR15's have never been my cup of tea, but the machining challenge was too good to pass up. There are a few companies that are selling low shelf receivers. Sure enough, the listing is … AR-15 Lower Parts Kits from $49.99 at Palmetto Armory AR-15 Lowers from $84.99 at Stag Arms The other downside is that it’s a product of its time, meaning when it was designed, there were less than a handful of companies making AR-15s. Milling a M16 spec lower is not difficult, if you have the drawings. "The lower is also threaded for a 1/4"-28 nylon tipped upper receiver tensioning screw." After milling both pockets take some measurements and compare it to the inspection drawing. Just curious. Remember: You Will need a lower receiver to complete the AR-15 M16 Rifle Kits. As such, ordering a M16A1 lower to an FFL in the United States by an individual is nothing short of impossible. Edited to add: If your vice jaws are shallow, clamping may cause the tops to spread without the top plate in place. 80 percent lower receivers and jig sets for AR-15 and AR-10 dpms type lower receivers. 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