Comments on: Proscribed Printables

By: Bucky

Bucky — Sun, 02 Sep 2012 15:59:31 +0000

Not all shootings and rampages happen in California. So why only in California for strict gun laws?

By: Witt Sullivan

Witt Sullivan — Sun, 29 Jan 2012 00:44:28 +0000

To convert an AR-15 to fully automatic requires the receiver to be modified to accept the extra parts enabling fully automatic fire, but modifying it in that way is illegal and counts as manufacturing a machine gun, which is illegal unless you have a license to manufacturer firearms. There are legal parts that can make any AR-15 fire automatically, but they’re so scarce they cost as much as a pre-1986 M-16 or AR-15 conversion, $10,000 or so.

By: DrewE

DrewE — Sat, 24 Sep 2011 16:13:00 +0000

> Likewise, I would only pull the trigger on a printed AR lower
with a long string while the rifle is held in a bench rest. And don’t
even think of printing an upper AR receiver, it will fail, and the
results will be painful.

Unlike other designs (such as the FAL) the AR-15 receivers are not involved in bolt lock-up (that comes from the bolt engaging an extension screwed on the rear of the barrel). Plastic AR-15 lower receivers are commercially available (like the CAV-15 polymer part).

A plastic upper with stock dimensions wouldn’t work well because there are a few pounds of steel barrel cantilevered off it.

Other forces on the receivers are limited.

By: Wes Nott

Wes Nott — Fri, 23 Sep 2011 23:21:00 +0000

No Jason, it’s legal to manufacture an AR-15 lower even in California. I completed an 80% lower receiver using my Drill Press and Dremel Tool.

By: Wes Nott

Wes Nott — Fri, 23 Sep 2011 23:21:00 +0000

No Jason, it’s legal to manufacture an AR-15 lower even in California. I completed an 80% lower receiver using my Drill Press and Dremel Tool.

By: Wes Nott

Wes Nott — Fri, 23 Sep 2011 23:21:00 +0000

No Jason, it’s legal to manufacture an AR-15 lower even in California. I completed an 80% lower receiver using my Drill Press and Dremel Tool.

By: Jake Bullard

Jake Bullard — Fri, 23 Sep 2011 19:01:00 +0000

That’s cool. I thin he did one out of wood to.

By: Jake Bullard

Jake Bullard — Fri, 23 Sep 2011 19:01:00 +0000

That’s cool. I thin he did one out of wood to.

By: Jeremy Nimmo

Jeremy Nimmo — Fri, 23 Sep 2011 07:28:00 +0000

Good to see a reasonable tone on a potentially contentious piece of machinery like this.

By: Sean

Sean — Thu, 22 Sep 2011 23:08:00 +0000

There was a dude using a cutting board to make an AR-15 lower “http://230grain.com/showthread.php?31611-Homebuilt-HPDE-AR15-Lower”.

The AR-15/M-16 family of firearms uses a system where the bolt locks into the barrel extension, thus reduces the stress on the lower receiver enough so that it only acts as a frame to hold all other components in alignment. Madness or genius, that is still being debated.