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README.md	Adding PM422 Songbird Single Shot Pistol by patrickiv.	2015-06-12 03:42:54 -07:00

README.md

PM422 Songbird .22LR Pistol

Author

JamesRPatrick

Version

1.8

Release Date

2015/06/12

Description

This is a single-shot, single-action 3d-printed pistol chambered in .22LR. It operates under a principle wherein the frame holds the barrel in compression axially and prevents the barrel layers from separating. This allows the barrel to be smaller in diameter than previous, unsupported designs. 100% printed barrels are not intended to have a long service life.

Special thanks to FP of FOSSCAD for printing and test firing this design.

Test Record

Version 1.7 was printed with 100% infill in ABS on a Rostock Max. The 100% printed barrel withstood 3 rounds without rupturing. The casing became stuck in the barrel and testing could not be continued on the firearm as designed. A printed barrel with a chamber insert lasted 15 rounds before cracking between layers, just forward of the insert, without harm to the operator. Two more 100% printed barrels were made and had a very short service life. A rifled barrel insert was used in a printed barrel that was modified by FP. This lasted many rounds and is still in service.

Printing

Requires a print bed of at least 11" diameter or at least 10" x 6" rectangular area.
All printed parts are to be printed in ABS, 100% infill, with maximum shells.
Use plenty of support material.
Print frame on its right side.
Print barrel standing on it rear end.
For a long service life, print "barrel short barrel insert_FP" and install a 2.5" rifled steel barrel insert using high-strength epoxy.
Print barrel catch on its front face.
Print trigger and hammer on their right sides.
Print pins standing upright.

Finishing

Install the legally required amount of metal in the grip using high-strength epoxy. Use acetone or epoxy to secure the Frame Cap.
Fit barrel to frame by sanding the front or rear end. With a round in the chamber, the barrel should be tight enough in the frame that it will not fall out even with no barrel catch.
Use a 2mm, a 3mm, and an 8mm drill bit to ream appropriate holes.
Use 1.75mm filament to secure the Hammer Pin and the Firing Pin Retainer.
Use a 1", 12 Gauge roofing nail with 0.281" head. Grind tip flat for 0.040" MAX protrusion. 12 gauge is 2.680mm diameter.
Acetone polish frame and outside of barrel. Other parts optional.
Use rubber bands or condoms to power the hammer, trigger, and barrel catch.

Changes

Changes from 1.0: -Barrel and frame have been shortened by 10mm.

Changes from 1.1: -Barrel and frame have been shortened by another 10mm.

Changes from 1.2: -Fixed issue with bore in frame.

Changes from 1.3: -Moved spacer from right side of hammer to right inside wall of frame.

Changes from 1.4: -Added frame cap.

Changes from 1.5: -Enlarged bore.

Changes from 1.6: -Extended trigger pin and hammer pin.

Changes from 1.7: -Added "barrel short barrel insert" by FP.

Planned changes for 2.0: -Eliminate need to cut and tie rubber bands. -Print frame in two halves and solvent weld, with alignment pegs. -Modify hole for barrel catch for no support. -Add drop safety. -Cut weight cavity from left side to eliminate support in handle. -Add recess in cavity to prevent overinsertion of frame cap. -Make hammer and trigger easier to print. -Eliminate filament hole in firing pin retainer.

DISCLAIMER

Use this information at your own risk and responsibility.

jamesrpatrick.com 2015