This is a remix of the chOdin chassis released by AWCY? and designed by Energylegs & DB Firearms.

This remix features the following changes:

• 3.5, 2.5, or 1.5 slot MLOK hand guards with integrated ARCA style rail
• Reinforcement ribs in the hand guard, this is plastic not aluminum
• Buffer tube and 1913 picatinny stock/brace mounting options
• Uses standard length action-screw
• Versions with a receiver lug/boss to lock into 10/22 receivers that feature a cleaning hole in the rear of receiver (tested with SBI C-71)
• 250mm Z-height sliced option with slotted lockup that is held together with action-screw (recommend a plastic-weld adhesive as well)
• General reinforcement and geometry changes based on my testing

Release Changelog

R1.4 (V2) - On request, opened up the radius of the hand guard reinforcement ribs and front of the hand guard to 1.0 inches + 2.5mm to accommodate larger muzzle devices when using barrels shorter than the hand guard. Fully compatible with the 1.2/1.3 releases.
R1.3 (V2) - Additional hand guard lengths added. Fully compatible with the R1.2 release. Hand guards with 2.5 and 1.5 MLOK slots.

R1.2 (V2) - This version features scalloped lightening cuts on the sides, and a shallower angle where the chassis meets the hand guard for strength. An ARCA rail was also integrated into the bottom of the hand guard. The hand guard has 3x full length MLOK slots and a half-length slot.

R1.1 (V1) - This was the original public release. It has flat sides and a steep angle where the chassis reduces in height to meet the hand guard. The hand guard has 4x full length MLOK slots.

What To Print

There are a lot of files included because I like to ensure there are options for as many people as possible. This can be confusing, here's the best explanation I can give.

The files are split into release number (R#) and version number (V#). Release numbers group files together that changed at the same time, and version numbers let you know which files are compatible with each other. The version number only changes when there are changes made that break backwards compatibility.

• All V2 releases work together. A V2 R1.2 receiver will work with a V2 R1.4 hand guard.
• A V1 R1.1 receiver will NOT work with a R1.3 V2) hand guard.

Files are further broken down into Two-Piece and One-Piece versions.

One-Piece versions are not split between the receiver and hand guard and may require a bigger printer to print correctly, especially for the buffer tube version as the print should be printed completely vertical to maximize strength of the threads. If you opt to print a one-piece version, that is all you need to print.

Two-Piece versions are split between the back “receiver” half and the front “hand guard” half. This makes printing them on 250mm Z-height printers much easier. The halves slot together and are held together by a factory length action bolt/screw. I HIGHLY RECOMMEND THAT YOU ALSO PLASTIC-WELD THESE PARTS! I've had good results with JB Plastic Bonder. When printing a two-piece version you will need to print a “receiver” and a “hand guard” piece and join them together. Ensure the versions match between both halves.

Selecting Your Files

When preparing to print you must first determine:

1. Do you need a receiver boss / lug? The boss / lug is a small protrusion on the interior of the chassis that will slot into a hole on the back of your receiver. Many aftermarket receivers feature a hole on the back to make cleaning the barrel easier after you remove the bolt assembly. If your receiver has this, it's worth printing a version with the boss/lug.
   1. There are AWCY / DB Firearms receivers that are designed to slot directly into a cutout below the boss / lug. My remix still allows for this if you plan to use one of these receivers.
2. What length hand guard do you want?
3. Does your barrel extend past the hand guard? If you're using a very short barrel, you may with to use version R1.4 as it has more space to accommodate thicker muzzle devices. This comes at a slight reduction in rigidity as material needed to be removed from the reinforcement ribs and the front of the hand guard.

Always follow the tenants of firearms safety!

1. Treat every firearm as if it were loaded
2. Never point a firearm at anything you do not wish to destroy
3. Keep your finger off the trigger until ready to fire
4. Be sure of your target and what is beyond before firing
5. Keep firearms unloaded when not in use

Assembly Instructions:

1. Assemble your receiver, barrel, charging handle, bolt, and trigger group.
2. Apply plastic-weld (Weldon, JB Plastic Bonder, etc) to angled faces of Hand Guard component.
3. Slide Hand Guard component into the Receiver component from bottom-up.
4. Remove excess plastic-weld adhesive.
5. Be sure there is no wet/uncured plastic-weld in the action-screw hole. Remove any excess very well before installing screw.
6. Thread in action screw to ensure proper alignment between both halves while plastic-weld cures.
7. Remove action screw.
8. Angle the assembled barrelled-receiver rear-first into the Receiver component of the chassis (start at the stock/rear end first), press and leverage the barrelled-receiver down into the Receiver component. It will be tight!
9. Install action screw.
10. Test for complete function of action.