I’ve got the parts to build one but never got around to it. Still have to chamber the barrel, which ive been putting off.

Now you’ve got me interested again.

not sure this is what you are looking for, there was no guide with this. this is the txt file that came with 2245 v1 mk4.

Cleaning up and archived some of my files so if I ever needed to reprint or something I’d have them all in one place. Figured id post it here since there are tons of little tweaks to the original design to help with fitment and reliability that are not all backward compatible. Credit to Sb327 for the initial design work
Credit also to the designer of the “lite” upper on Thingiverse, I really liked the look vs the brick I was working with so I redrew it and modified it to fit and actually run.

newer added bolt stop changed to accept a 94567A210, Aluminum Flared-Collar Knurled-Head Thumb Screw, 6-32 Thread Size, 3/8" Long rear bolt changed to 91304A157, Alloy Steel Hex Drive Flat Head Screws, M8 x 1.25 mm X 40 mm (you may need to kiss this with a file if you have a super tight bolt)

If anyone wants to give it a go, these have become my favorite cheap plinker :)

older mainspring (9657K367) Compression Spring, 1.75" Long, 0.36" OD, 0.258" ID pins (98380A730) .1563 x .875 rear screw (91223a222 or 91263A565) Ultra-Low-Profile Socket Head Screw, 1/4"-20 x 1-1/2" or Zinc-Plated Alloy Steel Hex Drive Flat Head Screw, 1/4"-20 X 1-3/4"

front screw (90272A151) Steel Pan Head Phillips Screw, 6-32 X 3/4" mag catch spring (cut down detent spring) mag catch pin (paperclip) liner from brownells Optional mag pluger screw (91792A115) Steel Pan Head Slotted Screws, 4-40 x 1" Optional mag plunger spring (generic 3/8 spring from hf spring kit) ejector screw (random #6 or M3)

Notes: most parts can be found at the local hardware store cheaper, mcmastercarr numbers included since thats what was modeled when installing mainspring use a hex key through the holes in the grip to retain paperclip for mag catch may need a drop of glue or bend to secure it ejector is slightly oversized and will need to be sanded for a close fit mainspring plunger can be printed but works best if made from a 3/8 bolt. may need to be shortened depending on how everything fits Clocking of the bolt is critical to avoid light strikes, adjust with the ejector

critical print settings: upper printed threads down 6+ walls 99% infill grip printed mag up 6+ walls 50% infill