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. We recommend fixturing and leveling the work piece horizontally in a vertical mill or drill press to ensure a straight hole through the lower. 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. When You assemble the Lower Receiver with the parts included in the kit, this will be a fully functional rifle. This is the AR15 / M16 Size. If out of tolerance, carefully consider how it will affect the function of your lower. Mill a trigger slot, swap lowers, mill the next trigger slot, swap lowers... rinse and repeat. mil spec vs. non-milspec lower receiver debate to rest. 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." The M16 is a fully automatic weapon and it would be illegal to build one in the "US" - as I was careful to mention. this is the most useful post on r/guns ever. The market share was largely owned by Colt and their SP-1 … 80 percent lower receivers and jig sets for AR-15 and AR-10 dpms type lower receivers. Machining an AR15 Lower Forging - August 26th, 2016 Back in late February I stumbled across a guy selling raw M16 lower forgings on Gunbroker. After milling both pockets take some measurements and compare it to the inspection drawing. with the mill head and/or tool holder. This is not a second just not completed to be called a lower receiver, or considered a firearm. All dimensions should be within the tolerance noted on the drawing. AR15's have never been my cup of tea, but the machining challenge was too good to pass up. Until then this is not an operational firearm. 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. 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. 15. As such, ordering a M16A1 lower to an FFL in the United States by an individual is nothing short of impossible. There are a few companies that are selling low shelf receivers. trying to print now, but I … 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. these blueprints will put the long debated ar 15/ m16. Sure enough, the listing is … I will also pay you moneys for a usable copy of this. Like that feature above and the threaded bolt catch and takedown pin are nice, especially for the price. So what makes it not M16? 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. Remember: You Will need a lower receiver to complete the AR-15 M16 Rifle Kits. Edited to add: If your vice jaws are shallow, clamping may cause the tops to spread without the top plate in place. 3) Placing a lower flat on its side on a single plate allows you to hold it for engraving. That's an interesting lower if you read the specs. Debur 16. All the info is on … Be sure of proper fitment in your lower by reaming the rear take down pin hole to .250 and the safety selector hole to .375 which will ensure an accurate drilling of the 3rd hole. 80 percent lower receiver No FFL required and All machine work that has been done is within Mil-Spec specifications. Just curious. 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